UNDERWATER PPT.pptx
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Underwater welding has been developed and improved over several decades. Some key developments include the first underwater welds by the British Admiralty in the 1940s, specialized waterproof electrodes created in the 1970s, and qualification of an underwater wet welding procedure to AWS standards. There are two main types of underwater welding - wet welding, which is done directly in the water, and dry welding, which uses pressurized habitats. Underwater welding is used for offshore construction, ship repair, salvaging sunken vessels, and repairing underwater pipelines. While it enables work in places not accessible otherwise, it also presents risks like hydrogen embrittlement and decompression sickness that require safety precautions.
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Under water welding ppt
Hyperbaric welding is the process in which a chamber is sealed around the structure to be welded and is filled with a gas ( He and Oxygen) at the prevailing pressure.
Underwaterwelding
Underwater welding is a specialized process that involves welding while submerged in water or in a pressurized environment. There are two main types of underwater welding - wet welding, which is done directly in water, and dry welding, which uses a pressurized habitat or chamber. Welding must account for the risks of hydrogen embrittlement, rapid quenching effects on material properties, and risks to the welder's health from changes in pressure. Precautions include adequate electrical insulation, venting of gases and voids, and monitoring the welder's safety. Automation of certain underwater welding tasks is also being developed to reduce risks.
underwaterwelding-121020023417-phpapp01.pptx.pdf
Underwater welding can be classified as wet welding or dry welding. Wet welding is done directly in the water, while dry welding is done inside a sealed chamber filled with gas at the water pressure. The first underwater welding was done in Britain to seal ship rivets. Special electrodes were later developed to allow underwater welding. Dry welding produces high quality welds but is more expensive due to complex equipment needed. Wet welding is cheaper and faster though welds have lower strength due to rapid quenching. Precautions must be taken to prevent dangers like gas explosions and electric shock when underwater welding.
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The document discusses underwater welding technology. It describes how underwater welding was first developed by the British Admiralty and then special waterproof electrodes were created. It discusses the different types of underwater welding including wet welding, dry welding using hyperbaric chambers, and different habitat sizes. It outlines the challenges of underwater welding including costs and equipment needs. It also discusses the welding processes, necessary equipment, safety considerations, and developing automation trends in the field.
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Underwater welding is a process similar to normal welding but performed underwater. It can be done through two methods - wet welding, which is done directly in water using waterproof electrodes, or dry welding, which uses a pressurized chamber filled with gas. Wet welding has advantages like minimal equipment needs and speed but risks like quenching and hydrogen embrittlement. Dry welding is safer but more complex and costly. Precautions must be taken to mitigate risks like electric shock, oxygen depletion, and pressure changes when underwater welding. Automation is increasingly being used to perform underwater welding.
Underwater welding
1) Underwater welding is used to repair structures like ships, oil rigs, and pipelines. It can be done wet in water or dry within a pressurized chamber.
2) Wet welding is simpler but produces lower quality welds due to quenching from water and hydrogen embrittlement. Dry welding allows better control but requires more complex equipment.
3) Advances include developing automated dry welding robots and testing friction and explosive welding at deeper depths. Ongoing research aims to improve welding quality and safety at high pressures.
Under water welding
This document discusses underwater welding. It begins by noting the first underwater welds done by the British Admiralty in the 1940s. It then covers the two main types of underwater welding - wet welding, where welding is done directly in the water, and dry welding, where a chamber is created to keep the area dry. The document discusses the equipment, materials, and safety considerations for underwater welding. It notes challenges like hydrogen embrittlement and reduced visibility. Overall, the document provides an introduction to the process and challenges of underwater welding.
Underwaterwelding 121020023417-phpaaa
This document provides an overview of underwater welding. It discusses two main types: wet welding, which is performed directly in water using specialized electrodes, and dry welding, where a chamber is created to allow welding in a dry environment. Wet welding is cheaper and faster but results in lower quality welds due to poor visibility and rapid cooling in water. Dry welding allows for higher quality welds but is more expensive due to specialized equipment needs. Underwater welding has applications in offshore construction, ship repair, and salvage operations where it provides a means for metal fabrication and joining underwater.
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Under water welding ppt
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underwaterwelding-121020023417-phpapp01.pptx.pdf
Underwater welding can be classified as wet welding or dry welding. Wet welding is done directly in the water, while dry welding is done inside a sealed chamber filled with gas at the water pressure. The first underwater welding was done in Britain to seal ship rivets. Special electrodes were later developed to allow underwater welding. Dry welding produces high quality welds but is more expensive due to complex equipment needed. Wet welding is cheaper and faster though welds have lower strength due to rapid quenching. Precautions must be taken to prevent dangers like gas explosions and electric shock when underwater welding.
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The document discusses underwater welding technology. It describes how underwater welding was first developed by the British Admiralty and then special waterproof electrodes were created. It discusses the different types of underwater welding including wet welding, dry welding using hyperbaric chambers, and different habitat sizes. It outlines the challenges of underwater welding including costs and equipment needs. It also discusses the welding processes, necessary equipment, safety considerations, and developing automation trends in the field.
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Underwater welding is a process similar to normal welding but performed underwater. It can be done through two methods - wet welding, which is done directly in water using waterproof electrodes, or dry welding, which uses a pressurized chamber filled with gas. Wet welding has advantages like minimal equipment needs and speed but risks like quenching and hydrogen embrittlement. Dry welding is safer but more complex and costly. Precautions must be taken to mitigate risks like electric shock, oxygen depletion, and pressure changes when underwater welding. Automation is increasingly being used to perform underwater welding.
Underwater welding
1) Underwater welding is used to repair structures like ships, oil rigs, and pipelines. It can be done wet in water or dry within a pressurized chamber.
2) Wet welding is simpler but produces lower quality welds due to quenching from water and hydrogen embrittlement. Dry welding allows better control but requires more complex equipment.
3) Advances include developing automated dry welding robots and testing friction and explosive welding at deeper depths. Ongoing research aims to improve welding quality and safety at high pressures.
Under water welding
This document discusses underwater welding. It begins by noting the first underwater welds done by the British Admiralty in the 1940s. It then covers the two main types of underwater welding - wet welding, where welding is done directly in the water, and dry welding, where a chamber is created to keep the area dry. The document discusses the equipment, materials, and safety considerations for underwater welding. It notes challenges like hydrogen embrittlement and reduced visibility. Overall, the document provides an introduction to the process and challenges of underwater welding.
Underwaterwelding 121020023417-phpaaa
This document provides an overview of underwater welding. It discusses two main types: wet welding, which is performed directly in water using specialized electrodes, and dry welding, where a chamber is created to allow welding in a dry environment. Wet welding is cheaper and faster but results in lower quality welds due to poor visibility and rapid cooling in water. Dry welding allows for higher quality welds but is more expensive due to specialized equipment needs. Underwater welding has applications in offshore construction, ship repair, and salvage operations where it provides a means for metal fabrication and joining underwater.
Underwater welding
Underwater welding is an important technique used for underwater fabrication. There are two main types: wet welding, where welding is performed directly under water using a special electrode, and dry welding, where an enclosed chamber is used to displace water and allow welding in a dry environment filled with gas. Wet welding is more common due to greater freedom of movement but has higher risks, while dry welding has higher costs but lower risks. Underwater welding requires higher currents than air welding due to water cooling the weld. It is used in offshore construction, ship repair, and salvage operations. Underwater welders require commercial diving certification and welding qualifications.
Under water welding presentation.pptx
1932 : soviet engineer Konstantin Khrenov made the first under water weld
in lab tests.
First under water welding was carried out by British Admiralty – Dockyard for
sealing leaking ships rivets below water line, in 1946.
In 1946, special waterproof electrodes were developed in Holland by
‘Van der Willingen’
Underwater Welding
It is the welding process done under the water with the help of two methods : Dry Welding and Wet Welding. The presentation provides basic knowledge on the underwater welding and it's respective techniques.
Under water welding
Underwater welding is used for repairing offshore structures like oil rigs and pipelines. There are two main types: wet welding, where welding occurs directly in water using techniques like MMA; and dry welding, where a chamber is created to weld in a dry environment, with techniques like GTAW and GMAW. Wet welding is cheaper but results in poorer weld quality due to quenching, while dry welding produces higher quality welds but requires more complex and expensive equipment like hyperbaric chambers. Proper insulation and ventilation are needed to address risks like electric shock and gas accumulation. Underwater welding is an important but challenging field with ongoing research into deeper diving capabilities.
under water welding
Underwater welding can be done either wet, surrounded by water, or dry inside a pressurized chamber. Wet welding uses manual metal arc welding and is more versatile and cost effective, but results in lower quality welds due to quenching from water and risks of hydrogen embrittlement. Dry welding produces higher quality welds but requires more complex and costly equipment. Both methods carry safety risks like electric shock, gas explosions, and decompression sickness that require precautions like electrical insulation, gas monitoring, emergency air supplies, and decompression chambers. Automation and new techniques like friction and stud welding show potential to advance underwater welding to greater depths.
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This document discusses various methods of underwater welding. It begins by classifying underwater welding into dry welding and wet welding. Dry welding involves welding inside a chamber that is sealed around the structure, while wet welding is performed directly under water. The document then describes the processes and equipment used for dry welding methods like hyperbaric and cavity welding. It also covers the principles, advantages, and disadvantages of wet welding. The document concludes by discussing applications of underwater welding, the effects of the wet environment on welds, and providing a graph showing the relationship between porosity and water pressure during welding.
UNDER WATER WELDING
Underwater welding is an important technique for underwater fabrication that was developed in the 1930s. There are two main types: wet welding, where the welder works directly in water using shielding gases; and dry welding, where a sealed chamber is created to allow welding in more favorable conditions. Underwater welding is used for tasks like repairing offshore oil rigs and pipelines, and requires special safety precautions due to the risks of electric shock, explosions, and decompression sickness.
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A concise presentation about underwater welding. It briefly discusses about the main types, risks involved and practices involved in underwater welding
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This document provides an overview of underwater welding, including its history, classifications, working principles, advantages, disadvantages, and applications. Underwater welding can be classified as either wet welding, where the welder works directly in water, or dry welding, where welding occurs inside a pressurized chamber. While wet welding is faster and cheaper, it produces lower quality welds compared to dry welding. Underwater welding is used for repairs of ships and structures and construction of pipelines and offshore oil rigs.
underwater welding
Welding processes have become increasingly important in almost all manufacturing industries and for structural application. Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern. In this regard, it is relevant to note that a great majority of offshore repairing and surfacing work is carried out at a relatively shallow depth, in the region intermittently covered by the water known as the splash zone. Though numerically, most ship repair and welding jobs are carried out at a shallow depth, the most technologically challenging task is repair at greater depths, especially in pipelines and repair of accidental failure. The advantages of underwater welding are largely of an economic nature, because underwater-welding for marine maintenance and repair jobs by passes the need to pull the structure out of the sea and saves valuable time and dry docking costs. It is also an important technique for emergency repairs which allow the damaged structure to be safely transported to dry facilities for permanent repair or scrapping. Underwater welding is applied in both inland and offshore environments, though seasonal weather inhibits offshore underwater welding during winter. In either location, surface supplied air is the most common diving method for underwater welders. Underwater welding is an important tool for underwater fabrication works.
Underwater hyperbaric welding was invented by the Russian metallurgist Konstantin Khrenov in 1932.
Hyperbaric welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.
Under water welding
Underwater welding is used for repairing offshore structures like oil rigs and pipelines. There are two types: wet welding, where welding occurs directly in water; and dry welding, where a chamber is created to keep water out. Wet welding uses manual metal arc welding and is cheaper but results in poorer quality welds due to quenching from water. Dry welding produces higher quality welds using gas tungsten or metal arc welding inside a pressurized chamber, but is more expensive. Precautions must be taken to prevent electric shocks and gas explosions when welding underwater. Research continues on welding deeper underwater through robotic technologies.
Under Water Welding
Underwater welding is an important process for repairing and constructing offshore structures like oil rigs and pipelines. There are two main types of underwater welding: wet welding, which is done directly in the water, and dry welding, which uses a pressurized chamber. Wet welding requires specialized waterproofed equipment but has faster work speeds, while dry welding allows for better quality control but with more complex, expensive equipment. Proper safety precautions must be taken due to risks like electric shock, gas explosions, and decompression sickness when working at increased pressures underwater. Automation trends include remote-controlled welding robots to reduce risks to human divers.
underwater welding.pdf
Underwater welding can be classified as wet welding, where welding is performed directly in water, or dry welding, where a dry chamber is created for welding. Wet welding uses manual metal arc welding with direct current and negative electrode polarity. It is a versatile and economical method but produces welds of lower quality due to quenching and hydrogen embrittlement risks. Dry welding produces higher quality welds but requires more complex and expensive equipment. Developments aim to improve wet welding quality and automate dry welding processes.
Presentation on underwater dry welding
1) Dry welding, also known as hyperbaric welding, is a process where welding is performed underwater inside a pressurized chamber filled with gas.
2) The first underwater welding was introduced by the British Admiralty in docks, and specialized underwater welding electrodes were later developed in the 1940s in Holland. Standard underwater welding procedures were established by the American Welding Society in the 1970s.
3) There are two main types of dry welding: cavity welding performed at one atmosphere, and habitat welding performed at hyperbaric pressure inside pressurized mini or large habitats on job sites. Automation and robots like THOR have improved the efficiency and safety of underwater welding.
Under water welding PPT
the paper presentation which we fetched information through refering more ppts and journals. hope it may be useful guys.
welding New trends
This document discusses underwater welding techniques. It begins by providing background on welding in general and how underwater welding arose during World War II to salvage sunk vessels. There are two main types of underwater welding: wet welding, where welding is done directly in water, and dry welding, which uses an enclosed positive pressure environment. Wet welding is the most common as it provides freedom of movement and is efficient and economical for repair work. The document then provides details on a specific wet welding project to repair submarine ballast tanks and the equipment and procedures used.
UNDER WATER WELDING
underwater welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.
Welding processes have become increasingly important in almost all manufacturing industries and for structural application.[5] Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern
Underwater welding
Underwater welding can be classified as dry welding, which uses sealed chambers, or wet welding, which is performed directly in water. Dry welding produces higher quality welds but requires more complex and expensive equipment. Wet welding is more economical but results in lower weld quality due to water's quenching effect. The underwater environment affects welds by introducing hydrogen that causes embrittlement and oxygen that increases porosity. Weld quality declines with increasing depth due to higher pressures. Proper welding equipment and techniques can help reduce these negative impacts.
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Underwater welding
Underwater welding is an important technique used for underwater fabrication. There are two main types: wet welding, where welding is performed directly under water using a special electrode, and dry welding, where an enclosed chamber is used to displace water and allow welding in a dry environment filled with gas. Wet welding is more common due to greater freedom of movement but has higher risks, while dry welding has higher costs but lower risks. Underwater welding requires higher currents than air welding due to water cooling the weld. It is used in offshore construction, ship repair, and salvage operations. Underwater welders require commercial diving certification and welding qualifications.
Under water welding presentation.pptx
1932 : soviet engineer Konstantin Khrenov made the first under water weld
in lab tests.
First under water welding was carried out by British Admiralty – Dockyard for
sealing leaking ships rivets below water line, in 1946.
In 1946, special waterproof electrodes were developed in Holland by
‘Van der Willingen’
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It is the welding process done under the water with the help of two methods : Dry Welding and Wet Welding. The presentation provides basic knowledge on the underwater welding and it's respective techniques.
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This document discusses various methods of underwater welding. It begins by classifying underwater welding into dry welding and wet welding. Dry welding involves welding inside a chamber that is sealed around the structure, while wet welding is performed directly under water. The document then describes the processes and equipment used for dry welding methods like hyperbaric and cavity welding. It also covers the principles, advantages, and disadvantages of wet welding. The document concludes by discussing applications of underwater welding, the effects of the wet environment on welds, and providing a graph showing the relationship between porosity and water pressure during welding.
UNDER WATER WELDING
Underwater welding is an important technique for underwater fabrication that was developed in the 1930s. There are two main types: wet welding, where the welder works directly in water using shielding gases; and dry welding, where a sealed chamber is created to allow welding in more favorable conditions. Underwater welding is used for tasks like repairing offshore oil rigs and pipelines, and requires special safety precautions due to the risks of electric shock, explosions, and decompression sickness.
UNDERWATER WELDING
A concise presentation about underwater welding. It briefly discusses about the main types, risks involved and practices involved in underwater welding
Underwater welding
Underwater welding is a specialized welding process that involves welding at depths below the surface of water. It can be classified as wet welding, where welding is done directly in water, or dry welding, where a dry chamber is created to perform the welding. Wet welding uses manual metal arc welding with direct current power and special electrodes. It allows for work in difficult to reach areas but results in lower quality welds due to quenching from the water. Dry welding produces higher quality welds by working in a pressurized chamber, but requires more complex and expensive equipment. Underwater welding is used for offshore construction, ship repair, and pipeline maintenance.
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This document provides an overview of underwater welding, including its history, classifications, working principles, advantages, disadvantages, and applications. Underwater welding can be classified as either wet welding, where the welder works directly in water, or dry welding, where welding occurs inside a pressurized chamber. While wet welding is faster and cheaper, it produces lower quality welds compared to dry welding. Underwater welding is used for repairs of ships and structures and construction of pipelines and offshore oil rigs.
underwater welding
Welding processes have become increasingly important in almost all manufacturing industries and for structural application. Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern. In this regard, it is relevant to note that a great majority of offshore repairing and surfacing work is carried out at a relatively shallow depth, in the region intermittently covered by the water known as the splash zone. Though numerically, most ship repair and welding jobs are carried out at a shallow depth, the most technologically challenging task is repair at greater depths, especially in pipelines and repair of accidental failure. The advantages of underwater welding are largely of an economic nature, because underwater-welding for marine maintenance and repair jobs by passes the need to pull the structure out of the sea and saves valuable time and dry docking costs. It is also an important technique for emergency repairs which allow the damaged structure to be safely transported to dry facilities for permanent repair or scrapping. Underwater welding is applied in both inland and offshore environments, though seasonal weather inhibits offshore underwater welding during winter. In either location, surface supplied air is the most common diving method for underwater welders. Underwater welding is an important tool for underwater fabrication works.
Underwater hyperbaric welding was invented by the Russian metallurgist Konstantin Khrenov in 1932.
Hyperbaric welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.
Under water welding
Underwater welding is used for repairing offshore structures like oil rigs and pipelines. There are two types: wet welding, where welding occurs directly in water; and dry welding, where a chamber is created to keep water out. Wet welding uses manual metal arc welding and is cheaper but results in poorer quality welds due to quenching from water. Dry welding produces higher quality welds using gas tungsten or metal arc welding inside a pressurized chamber, but is more expensive. Precautions must be taken to prevent electric shocks and gas explosions when welding underwater. Research continues on welding deeper underwater through robotic technologies.
Under Water Welding
Underwater welding is an important process for repairing and constructing offshore structures like oil rigs and pipelines. There are two main types of underwater welding: wet welding, which is done directly in the water, and dry welding, which uses a pressurized chamber. Wet welding requires specialized waterproofed equipment but has faster work speeds, while dry welding allows for better quality control but with more complex, expensive equipment. Proper safety precautions must be taken due to risks like electric shock, gas explosions, and decompression sickness when working at increased pressures underwater. Automation trends include remote-controlled welding robots to reduce risks to human divers.
underwater welding.pdf
Underwater welding can be classified as wet welding, where welding is performed directly in water, or dry welding, where a dry chamber is created for welding. Wet welding uses manual metal arc welding with direct current and negative electrode polarity. It is a versatile and economical method but produces welds of lower quality due to quenching and hydrogen embrittlement risks. Dry welding produces higher quality welds but requires more complex and expensive equipment. Developments aim to improve wet welding quality and automate dry welding processes.
Presentation on underwater dry welding
1) Dry welding, also known as hyperbaric welding, is a process where welding is performed underwater inside a pressurized chamber filled with gas.
2) The first underwater welding was introduced by the British Admiralty in docks, and specialized underwater welding electrodes were later developed in the 1940s in Holland. Standard underwater welding procedures were established by the American Welding Society in the 1970s.
3) There are two main types of dry welding: cavity welding performed at one atmosphere, and habitat welding performed at hyperbaric pressure inside pressurized mini or large habitats on job sites. Automation and robots like THOR have improved the efficiency and safety of underwater welding.
Under water welding PPT
the paper presentation which we fetched information through refering more ppts and journals. hope it may be useful guys.
welding New trends
This document discusses underwater welding techniques. It begins by providing background on welding in general and how underwater welding arose during World War II to salvage sunk vessels. There are two main types of underwater welding: wet welding, where welding is done directly in water, and dry welding, which uses an enclosed positive pressure environment. Wet welding is the most common as it provides freedom of movement and is efficient and economical for repair work. The document then provides details on a specific wet welding project to repair submarine ballast tanks and the equipment and procedures used.
UNDER WATER WELDING
underwater welding is the process of welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry inside a specially constructed positive pressure enclosure and hence a dry environment. It is predominantly referred to as "hyperbaric welding" when used in a dry environment, and "underwater welding" when in a wet environment. The applications of hyperbaric welding are diverse—it is often used to repair ships, offshore oil platforms, and pipelines. Steel is the most common material welded.
Welding processes have become increasingly important in almost all manufacturing industries and for structural application.[5] Although a large number of techniques are available for welding in atmosphere, many of these techniques cannot be applied in offshore and marine application where presence of water is of major concern
Underwater welding
Underwater welding can be classified as dry welding, which uses sealed chambers, or wet welding, which is performed directly in water. Dry welding produces higher quality welds but requires more complex and expensive equipment. Wet welding is more economical but results in lower weld quality due to water's quenching effect. The underwater environment affects welds by introducing hydrogen that causes embrittlement and oxygen that increases porosity. Weld quality declines with increasing depth due to higher pressures. Proper welding equipment and techniques can help reduce these negative impacts.
Under water welding
Underwater welding includes a lot of different processes that join metals on offshore oil platforms, pipelines & ships .It is the process of welding under water using various techniques under various conditions.....etc.!!!
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It gives the overall description of SIH problem statement " AI assisted telemedicine KIOSK for Rural India".
学校原版美国波士顿大学毕业证学历学位证书原版一模一样
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Rainfall intensity duration frequency curve statistical analysis and modeling...
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
Mechanical Engineering on AAI Summer Training Report-003.pdf
Mechanical Engineering PROJECT REPORT ON SUMMER VOCATIONAL TRAINING
AT MBB AIRPORT
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
2008 BUILDING CONSTRUCTION Illustrated - Ching Chapter 02 The Building.pdf
2008 BUILDING CONSTRUCTION Illustrated - Ching Chapter 02 The Building
Advanced control scheme of doubly fed induction generator for wind turbine us...
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
Null Bangalore | Pentesters Approach to AWS IAM
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
An improved modulation technique suitable for a three level flying capacitor ...
This research paper introduces an innovative modulation technique for controlling a 3-level flying capacitor multilevel inverter (FCMLI), aiming to streamline the modulation process in contrast to conventional methods. The proposed
simplified modulation technique paves the way for more straightforward and
efficient control of multilevel inverters, enabling their widespread adoption and
integration into modern power electronic systems. Through the amalgamation of
sinusoidal pulse width modulation (SPWM) with a high-frequency square wave
pulse, this controlling technique attains energy equilibrium across the coupling
capacitor. The modulation scheme incorporates a simplified switching pattern
and a decreased count of voltage references, thereby simplifying the control
algorithm.
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UNDERWATER PPT.pptx
- 1. Seminar On Underwater welding Submitted to: submitted by: Department of Mechanical Rohit Kawlani engineering 19EUCME053 1
- 2. • First under water welding by British Admiralty – Dockyard • In 1946, special waterproof electrodes were developed in Holland by ‘Van der Willingen’ • 1970s: Whitey Grubbs and Dale Anderson of Chicago Bridge & Iron (CB&I) qualified an underwater wet welding procedure to American Welding Society (AWS) standards. 2
- 4. We cant lift ship and then repair it. Hence comes the use of underwater welding 4
- 5. •Wet welding •Dry welding 5
- 6. Hyperbaric welding is the process in which a chamber is sealed around the structure to be welded and is filled with a gas ( He and Oxygen) at the prevailing pressure. 6
- 7. Dry welding can be of two types •Large habitat •Mini habitat Mini habitat for underwater welding. 7 Large habitat for underwater welding
- 8. 8 Large habitat underwater welding
- 9. •Welder /diver safety •Good weld quality •Surface monitoring 9 • Higher cost of process, training, etc • Large quantity of costly and complex equipments • More deep, more energy requirement. • Cant weld if weld spot is at unreachable place
- 10. • Simply means that job is performed directly in the water • It involves using special rod and is similar to the process in ordinary air welding 10
- 11. 11
- 12. • Cheapest • Fastest • Tensile strength is high • Ease of access the weld spot • No waste of time in constructing habitat 12
- 13. • Rapid quenching decreases impact strength, Ductility. • Hydrogen embrittlement. • Poor visibility in water. • Higher energy density of hydrogen, higher efficiency. 13
- 14. 14
- 15. 15 Offshore construction for tapping sea resources. Temporary repair work caused by ship’s collisions or unexpected accidents. Salvaging vessels sunk in the sea. Repair and maintenance of ships. Construction of large ships beyond the capacity of existing docks. Repair and maintenance of underwater pipelines.
- 16. • Hydrogen and oxygen are dissociated from the water and will travel separately as bubbles • Oxygen cutting is about 60 percent efficient • Above river beds, especially in mud, because trapped methane gas in the proper concentrations can explode. 16
- 17. • There is a risk to the welder/diver of electric shock. • There is a risk that defects may remain undetected • The other main area of risk is to the life or health of the welder/diver from nitrogen introduced into the blood steam during exposure to air at increased pressure 17
- 18. • Start cutting at the highest point and work downward • By withdrawing the electrode every few seconds to allow water to enter the cut • Gases may be vented to the surface with a vent tube (flexible hose) secured in place from the high point where gases would collect to a position above the waterline. 18
- 19. • Precautions include achieving adequate electrical insulation of the welding equipment • Areas and voids must be vented or made inert 19
- 20. • Development of alternative welding methods like friction welding, explosive welding, and stud welding. • Present trend is towards automation. THOR – 1 (TIG Hyperbaric Orbital Robot) is developed where diver performs pipefitting, installs the track and orbital head on the pipe and the rest process is automated. 20
- 21. 21