Satyam Maurya presented on friction stir welding. The presentation covered the basics of friction stir welding including the process, microstructure, parameters, tooling, applications and advantages. Friction stir welding is a solid-state welding technique that uses a rotating tool to generate frictional heat and plasticize the materials being joined without melting them. It results in strong, high quality welds and is particularly useful for welding aluminum and magnesium alloys.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
ANALYSIS OF TOOL USED FOR FRICTION STIR SPOT WELDING BY EXPLICIT MESHING SCH...vivatechijri
FSSW is an advanced and popular solid-state material welding method, which has achieved a
different variety of popularity in service in industries and automotive. FSSW method (technique) is used for joining
similar or dissimilar materials like aluminium, titanium, magnesium and copper alloys etc. This paper presents
finite element modeling of friction stir spot welding (FSSW) process using Abaqus/Explicit as a finite element
solver. Three-dimensional coupled thermal-stress model was used to calculate thermo-mechanical response of
FSSW process. The various factors such as rotational speed, transverse speed and profile of the tool plays a very
significant role in the joining quality of material using FSSW.
The main target of this analysis is to observe the variation of tool profile and welding quality of Ti 6Al 4V alloy
as the tool speed varies. Two Ti 6Al 4V were lapped and provided with support to the bottom of the plate known
as a back anvil to constrain the motion. This is where we analyzed the material flow due to friction of heat
generation in the weld zone. Ti 6Al 4V is one of the most commonly used materials and its applications, where
low density and excellent corrosion is applied in a wide range of resistance, are necessary in industries such as
aerospace industry and biomechanical, marine, chemical industries, gas turbine, etc.
Effect of various process parameters on friction stir welded jointeSAT Journals
Abstract Pure and ZnS added ADP (ammonium dihydrogen phosphate) single crystals have been grown at room temperature by the free evaporation method. A total of six crystals have been grown and characterized structurally, chemically, thermally, optically, mechanically and electrically by using the suitable standard methods. Results obtained indicate that the impurity molecules have entered into the ADP crystal matrix. ZnS addition is found to increase the SHG efficiency significantly. All the grown crystals exhibit good optical transmission in the entire visible region. Results of AC and DC electrical measurements indicate a normal dielectric behaviour for all the six crystals grown. The electrical parameters, viz., DC electrical conductivity, dielectric constant, dielectric loss factor and AC electrical conductivity are found to increase with the increase in temperature. The optical, mechanical and electrical parameters are found to vary nonlinearly with the impurity (ZnS) concentration. Keywords: ADP crystal, Crystal growth, Doped crystals, Physical properties, X-ray diffraction.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
ANALYSIS OF TOOL USED FOR FRICTION STIR SPOT WELDING BY EXPLICIT MESHING SCH...vivatechijri
FSSW is an advanced and popular solid-state material welding method, which has achieved a
different variety of popularity in service in industries and automotive. FSSW method (technique) is used for joining
similar or dissimilar materials like aluminium, titanium, magnesium and copper alloys etc. This paper presents
finite element modeling of friction stir spot welding (FSSW) process using Abaqus/Explicit as a finite element
solver. Three-dimensional coupled thermal-stress model was used to calculate thermo-mechanical response of
FSSW process. The various factors such as rotational speed, transverse speed and profile of the tool plays a very
significant role in the joining quality of material using FSSW.
The main target of this analysis is to observe the variation of tool profile and welding quality of Ti 6Al 4V alloy
as the tool speed varies. Two Ti 6Al 4V were lapped and provided with support to the bottom of the plate known
as a back anvil to constrain the motion. This is where we analyzed the material flow due to friction of heat
generation in the weld zone. Ti 6Al 4V is one of the most commonly used materials and its applications, where
low density and excellent corrosion is applied in a wide range of resistance, are necessary in industries such as
aerospace industry and biomechanical, marine, chemical industries, gas turbine, etc.
Effect of various process parameters on friction stir welded jointeSAT Journals
Abstract Pure and ZnS added ADP (ammonium dihydrogen phosphate) single crystals have been grown at room temperature by the free evaporation method. A total of six crystals have been grown and characterized structurally, chemically, thermally, optically, mechanically and electrically by using the suitable standard methods. Results obtained indicate that the impurity molecules have entered into the ADP crystal matrix. ZnS addition is found to increase the SHG efficiency significantly. All the grown crystals exhibit good optical transmission in the entire visible region. Results of AC and DC electrical measurements indicate a normal dielectric behaviour for all the six crystals grown. The electrical parameters, viz., DC electrical conductivity, dielectric constant, dielectric loss factor and AC electrical conductivity are found to increase with the increase in temperature. The optical, mechanical and electrical parameters are found to vary nonlinearly with the impurity (ZnS) concentration. Keywords: ADP crystal, Crystal growth, Doped crystals, Physical properties, X-ray diffraction.
FRICTION STIR WELDING is a very latest tchnology of welding process .Its a green method of solid state joining, and also a defect free method .
To know more about this you can also watch this animation https://youtu.be/kEEST5cgOao
Study on Effect of Different Tool Design & Material in Friction Stir WeldingIJERA Editor
Friction Stir Welding (FSW) is a solid state joining process that involves joining of metals without fusion or filler materials. The frictional heat is produced from a rapidly rotating non- consumable high strength tool pin that extends from a cylindrical shoulder. The process is particularly applicable for aluminum alloys but can be extended to other products also. Plates, sheets and hollow pipes can be welded by this method. The process is also suitable for automation. The weld produced is of finer micro structure and superior in characteristics to that parent metal. FSW finds application in shipbuilding, aerospace, railway, electrical and automotive industry. The limitations of FSW are reduced by intensive research and development. Its cost effectiveness and ability to weld dissimilar metals makes it a commonly used welding process in recent times.
Friction Stir Welding, a type of welding which was
discovered in the year of 1991 with a few countable methods
and processes. But today it is one of the necessary and
important type of welding techniques. To develop it, several
researchers showed their interests in this technique. Today,
it acts as the heart of welding of automobiles. Thousands of
inventions has been made in field of Friction Stir Welding
and also successfully being implemented. If a researcher
tries to make some research in this field, he has to go
through thousands of journals where hours of time is being
consumed. To solve that problem several Re-view journals
are being published and also successfully solved this issue
of time consumption. In this paper, similarly a re-view of
several important and different types of papers are discussed
with their results, outcomes, the parameters being performed
for analysis.
This paper also discusses about various methods and various
metals as tools and job materials. It will be much easier and
lenient to understand from this paper to research. The
authors of the papers also clearly explained about the usages
and applications of their methods and provided several
statistical data for clear observation of their methods
Friction stir welding was invented by Wayne Thomas at Twi Limited (The Welding Institute) in England at 1991.
It overcomes many of the problems associated with conventional
joining techniques.
FSW is low energy input, capable of producing very high strength
welds in wide range of materials at lower cost
FSW process takes place in the solid phase below the melting point of the materials to be joined
A Comparative Study on Linear Friction Welding for Dissimilar MetalsIJMER
Linear Friction welding (LFW) is a solid state joining process in which a joint between
two metals can be formed through the intimate contact of a plasticised layer at the interface of the
adjoining specimens. When a stationary workpiece is pushed against another workpiece which is moving
in a linear reciprocating manner, the plasticised layer is created through a combination of frictional
heating between these two metals. This paper will cover the basics of the process and the fundamental
aspects of operating a LFW machine using dissimilar metals
Modeling and Simulation of Base Plate of Friction Stir Welding-Advanced Weldi...ijsrd.com
Friction stir processing is an emerging technique based on the principles of friction stir welding (FSW). It is a solid-state joining method that is energy efficient, environmentally friendly, and versatile. It is considered by many to be the most significant development in metal joining in a decade. The basic concept of friction stir processing is remarkably simple. A rotating tool with pin and shoulder is inserted in the material to be joined, and traversed along the line of interest. The heating is localized, and is generated by friction between the tool and the work piece, with additional adiabatic heating from metal deformation. A processed zone is produced by movement of material from the front of the pin to the back of the pin.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
FRICTION STIR WELDING is a very latest tchnology of welding process .Its a green method of solid state joining, and also a defect free method .
To know more about this you can also watch this animation https://youtu.be/kEEST5cgOao
Study on Effect of Different Tool Design & Material in Friction Stir WeldingIJERA Editor
Friction Stir Welding (FSW) is a solid state joining process that involves joining of metals without fusion or filler materials. The frictional heat is produced from a rapidly rotating non- consumable high strength tool pin that extends from a cylindrical shoulder. The process is particularly applicable for aluminum alloys but can be extended to other products also. Plates, sheets and hollow pipes can be welded by this method. The process is also suitable for automation. The weld produced is of finer micro structure and superior in characteristics to that parent metal. FSW finds application in shipbuilding, aerospace, railway, electrical and automotive industry. The limitations of FSW are reduced by intensive research and development. Its cost effectiveness and ability to weld dissimilar metals makes it a commonly used welding process in recent times.
Friction Stir Welding, a type of welding which was
discovered in the year of 1991 with a few countable methods
and processes. But today it is one of the necessary and
important type of welding techniques. To develop it, several
researchers showed their interests in this technique. Today,
it acts as the heart of welding of automobiles. Thousands of
inventions has been made in field of Friction Stir Welding
and also successfully being implemented. If a researcher
tries to make some research in this field, he has to go
through thousands of journals where hours of time is being
consumed. To solve that problem several Re-view journals
are being published and also successfully solved this issue
of time consumption. In this paper, similarly a re-view of
several important and different types of papers are discussed
with their results, outcomes, the parameters being performed
for analysis.
This paper also discusses about various methods and various
metals as tools and job materials. It will be much easier and
lenient to understand from this paper to research. The
authors of the papers also clearly explained about the usages
and applications of their methods and provided several
statistical data for clear observation of their methods
Friction stir welding was invented by Wayne Thomas at Twi Limited (The Welding Institute) in England at 1991.
It overcomes many of the problems associated with conventional
joining techniques.
FSW is low energy input, capable of producing very high strength
welds in wide range of materials at lower cost
FSW process takes place in the solid phase below the melting point of the materials to be joined
A Comparative Study on Linear Friction Welding for Dissimilar MetalsIJMER
Linear Friction welding (LFW) is a solid state joining process in which a joint between
two metals can be formed through the intimate contact of a plasticised layer at the interface of the
adjoining specimens. When a stationary workpiece is pushed against another workpiece which is moving
in a linear reciprocating manner, the plasticised layer is created through a combination of frictional
heating between these two metals. This paper will cover the basics of the process and the fundamental
aspects of operating a LFW machine using dissimilar metals
Modeling and Simulation of Base Plate of Friction Stir Welding-Advanced Weldi...ijsrd.com
Friction stir processing is an emerging technique based on the principles of friction stir welding (FSW). It is a solid-state joining method that is energy efficient, environmentally friendly, and versatile. It is considered by many to be the most significant development in metal joining in a decade. The basic concept of friction stir processing is remarkably simple. A rotating tool with pin and shoulder is inserted in the material to be joined, and traversed along the line of interest. The heating is localized, and is generated by friction between the tool and the work piece, with additional adiabatic heating from metal deformation. A processed zone is produced by movement of material from the front of the pin to the back of the pin.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
1. SEMINAR PRESENTATION
ON
FRICTION STIR WELDING
Presented By:
Satyam Maurya
Final B.Tech. Mechanical
Engineering
200110055
Submitted To:
Dr. Nishant Kumar Singh
Professor
Mechanical Engineering
Department
Department Of Mechanical Engineering
School Of Engineering
Harcourt Butler technical university, Kanpur
Nawabganj, Kanpur (U.P.)
Session 2023-24
2. Contents
Introduction
Types of FSW
Steps in Friction Wielding Process
Principle of operation
Microstructure
Process parameters
Types of tool bits in FSW
Types of joints
Set Up
Comparison with other joining processes
Application areas
Advantages
Disadvantages
3. It is a solid-state welding and it
is performed using heat
generated from the friction of a
rotating tool.
This process is invented and
patented by The Welding
Institute (TWI) in the United
Kingdom in 1991 for butt and
lap welding of metals and
plastics.
The maximum temperature
rises is about 0.8 of the melting
point temperature of the base
materials.
4. Friction Stir Welding (FSW) can
be considered as a
“green technology”
because no gases are evolved
during the process. Also, there are
no toxic fumes or smoke produced
during or after the welding
process.
The process is energy
efficient and environmentally
friendly.
Compared to other conventional
fusion welding methods, FSW
offers a number of advantages.
5.
6. Steps in Friction Wielding Process
1. Positioning plates
2. Pin penetrating in to plate
3. Tool travel
4. Pin removal
7.
8. The process involves plunging a non-consumable tool
between the abutting edges of the two plates to be butt welded,
traversing the tool along the joint line (at a
predetermined rotational speed and feed rate), and at the end,
the tool is retracted from the weld. The fundamental
difference between conventional welding techniques and the
solid-state Friction Stir Welding (FSW) technique is that no
heat is added to the ‘system’; instead heat is generated
internally by means of friction between the tool-material
interface resulting in the plastic deformation of the material
around the stir zone.
Principle of Operation
9. FSW process involves four phases which are:
1) Plunging phase,
2) Dwelling phase
3) Welding phase, and
4) Exit or retract phase.
Plunging phase: The process starts with rotating tool pin
or probe thrusting onto the configured work materials
under a constant axial load to generate friction heat.
• In this phase the temperature between rotating tool and
the workpiece increases
• The process continue until the temperature at the
immediate contact of the rotating tool and the work
material increased to a temperature which causes the
work material to soften, plasticized and significantly lose
its strength.
10. • The end of the plunging phase is signified by the
sound contact of the rotating tool shoulder with the
immediate work material surface.
Dwelling phase : Here the rotating tool is allowed to
dwell for a period of time, causing the temperature to
increase further, up to its hot working temperature.
• The heat generated from frictional work is greatly
dependent on the relative increase of contact surface area
as well as the relative speed.
Retract phase : At the end of FSW process, the rotating
tool is retracted away from the work material leaving a
cylindrical hole mark that once occupied by the tool pin.
• The cylindrical hole may be filled with filler material at the
end of the welding process but the most common method
used is by introducing dummy material prior the exit
phase.
11. Microstructure:
A. Unaffected material
B. Heat affected zone (HAZ)
C. Thermo-mechanically affected zone (TMAZ)
D. Weld nugget (Part of thermo-mechanically affected
zone)
12. Process Parameters
FSW involves complex material movement and plastic
deformation. Welding parameters, tool geometry, and joint
design exert significant effect on the material flow pattern
and temperature distribution.
• Tool rotational speed
• Tool transverse speed
• Tool tilt angle
• Tool plunge depth
• Tool plunging force
• Tool geometry
• Tool shoulder diameter
• Pin length
• Pin geometry
13. STRESS ANALYSIS :
• The tool pin, the weakest component of the tool, experiences
severe stresses at high temperatures due to both bending moment
and torsion.
• It is shown that the optimum tool pin geometry can be determined
from its load bearing capacity for a given set of welding variables
and tool and work-piece materials.
• The traverse force and torque during friction stir welding are
computed using a three-dimensional heat transfer and viscoplastic
material flow model considering temperature and strain rate-
dependent flow stress of the work-piece material.
• These computed values are used to determine the maximum shear
stress experienced by the tool pin due to bending moment and
torsion for various welding variables and tool pin dimensions.
• It is shown that a tool pin with smaller length and larger diameter
will be able to sustain more stress than a longer pin with smaller
diameter.
• The proposed methodology is used to explain the failure and
deformation of the tool is contributed by low values of factor of
safety in an environment of high temperature and severe stress.
14. Tool Material used according to the Welded Material :
Size of Material that can be welded :
Currently the sizes of the clamping arrangements determine the size of
welded structure and, although length of plate is no longer a problem,
the plate being passed between the clamps after welding to allow
location and clamping of the next section, the actual width of the
clamps must be of a finite size so there is a restriction in the maximum
width of plate Producible.
Example : Perhaps the whole plate for a ship’s hull can be produced in
one piece and then fabricated to shape.
25. • Floor panels for bullet trains
• Inserts for nuclear fuel
Preliminary trails using a Friction Stir Weld method
for near net-shape manufacture and three-
dimensional material processing show promise, but
much work will be required to develop and perfect the
technique.
26. Advantages:
Diverse materials: Welds a wide range of alloys, including
previously un- weldable (and possibly composite materials).
Durable joints: Provides twice the fatigue resistance of fusion
welds.
Versatile welds: Welds in all positions and creates straight or
complex-shape welds.
Retained material properties: Minimizes material distortion
Safe operation: Does not create hazards such as welding fumes,
radiation, high voltage, liquid metals, or arcing.
No keyholes: Pin is retracted automatically at end of weld.
Tapered-thickness weld joints: Pin maintains full penetration.
27. Disadvantages:
Work pieces must be rigidly clamped.
Backing bar required (except where self-reacting tool or
directly opposed tools are used).
Keyhole at the end of each weld.
Cannot make joints which required metal deposition (e.g.
fillet welds).
28. Conclusions:
FINALLY, FSW IS AN ENVIRONMENTAL FRIENDLY
MANUFACTURING PROCESS BEING USED AND PRESENTLY
UNDERGOING FURTHER RESEARCH FOR BETTER
UTILIZATION.
Plunging forcePlungling time - time taken in nib or probe touch to sholderPlunging phaseDwelling phaseTraverse speed
Weilding phase
Exit or retract phase
Dummy material