Underwaterwelding
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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.
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Under water welding presentation.pptx
1932 : soviet engineer Konstantin Khrenov made the first under water weld
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First under water welding was carried out by British Admiralty – Dockyard for
sealing leaking ships rivets below water line, in 1946.
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Under water welding.smnr
The document discusses underwater welding. It begins by explaining that underwater welding involves processes that join steel on offshore structures, pipelines, and ships underwater. It then covers the principles of underwater welding, classifications of wet and dry underwater welding, advantages and disadvantages of each method, risks and safety considerations, and applications of underwater welding such as offshore construction and ship repair. It concludes by discussing future developments in automation and new techniques like friction welding.
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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.
Underwater welding
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.
UNDERWATER PPT.pptx
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.
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.
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 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 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
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.!!!
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.
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.
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.
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.
Abhishek jain underwater welding
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.
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.
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 (1) (3)
The document discusses underwater welding techniques, including wet and dry welding. Wet welding is done at ambient water pressure with divers using special electrodes. Dry welding uses a pressurized chamber filled with gas to shield the weld from water pressure. Common processes for dry welding include GTAW and SMAW. Dry welding provides better quality welds but requires more complex and costly equipment than wet welding. Underwater welding faces risks from electric shock, gas explosions, and pressure injuries and is used in applications like offshore oil pipelines and ship repair.
UNDER WATER WELDING
This document provides an overview of underwater welding, including a brief history, the two main types (wet and dry welding), advantages and disadvantages of each, applications, risks involved, safety rules, and future developments. It discusses how underwater welding was pioneered in the 1930s in Russia and how the techniques have evolved. Wet welding is done directly in water while dry welding uses an enclosed chamber. Underwater welding is used to repair ships, offshore platforms, and pipelines and allows construction in underwater environments. Safety is important due to risks like electric shock and gas explosions. The future of underwater welding may include increased automation and new techniques like friction welding.
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Underwaterwelding
- 1. UNDERWATER WELDING TECHNOLOGY ,ART , COURAGE SHOBHIT ISHAN 474/09 SEMINAR ON 1
- 2. • First under water welding by British Admiralty – Dockyard • In 1946, special waterproof electrodes were developed in Holland by ‘Van der Willingen’ 2
- 4. We cant lift ship and then repair it. Hence comes the use of underwater welding 4
- 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
- 8. Large habitat for underwater welding Source: north stream 8
- 9. 9 Large habitat underwater welding
- 10. •Welder /diver safety •Good weld quality •Surface monitoring 10
- 11. • 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 11
- 12. • 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 12
- 13. 13
- 14. ‹#›
- 15. 15 • WATER-------------HYDROGEN + OXYGEN • Dissolve in weld pool • Solubility decrases and then comes out - porosity • Oxygen as solid , liquid inclusions or gases • Hydrogen combines with oxygen forming vapour
- 17. 17 Porosity-troubleshooted by including Calcium carbonate
- 19. 19 • Effect of alloying elements on weld metal microstructure and properties • Managanese • Boron and titanium • Rare earth metals
- 20. • Cheapest • Fastest • Tensile strength is high • Ease of access the weld spot • No waste of time in constructing habitat 20
- 21. • Rapid quenching decreases impact strength, Ductility. • Hydrogen embrittlement. • Poor visibility in water. • Higher energy density of hydrogen, higher efficiency. 21
- 22. • Power supply requrements-400 amp or larger. DC generators, motor generators and rectifiers are acceptable power supplies • Power converters. • Welding Generator, Pre-Setup • Polarity. • Diesel Driven Welding Generator Amperage and Voltage settings. • Gas Manifolds. 22
- 23. • Underwater Oxygen-Arc Welding Torches.- Collet or grip Oxygen valve Flash arrester • Waterproofing Surface Electrodes. Epoxy 152 Lee lac 30-l2093 Polyurethane 23
- 24. 24 Figure showing schematic diagram for underwater welding or cutting
- 25. • 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. 25
- 26. • 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 26
- 27. • 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. 27
- 28. • Precautions include achieving adequate electrical insulation of the welding equipment • Areas and voids must be vented or made inert 28
- 29. • 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. 29
- 30. 30