Appy-welding

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WELDING TECHNOLOGY : 

WELDING TECHNOLOGY Presented By: ABHINAV KUMAR B4801 ROLL-A05

CONTENTS : 

CONTENTS Brief history of welding Introduction to welding, its importance Types of welding Careers in welding The American welding society (AWS) Types of joints Symbols used in welding Application of welding Safety 1/21/2011 © ABHINAV 2

A Brief History of Welding : 

A Brief History of Welding 1/21/2011 © ABHINAV 3 Late 19th Century Scientists/engineers applied advances in electricity to heat and/or join metals (Le Chatelier, Joule, etc.) Early 20th Century Prior to WWI welding was not trusted as a method to join two metals due to crack issues 1930’s and 40’s Industrial welding gained acceptance and were used extensively in the war effort to build tanks, aircraft, ships, etc. Modern Welding the nuclear/space age helps bring welding from an art to a science

Introduction to welding : 

Introduction to welding Welding is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the application of pressure alone, and with or without the use of filler material. Welding is used for making permanent joints. 1/21/2011 © ABHINAV 4

Why is welding important? : 

Why is welding important? Many things around us are welded … Pipelines that bring fresh water Towers that carry electricity to houses Cars and buses that take people where they need to go 1/21/2011 © ABHINAV 5

Classification of welding processes : 

Classification of welding processes (i). Arc welding Carbon arc Metal arc Metal inert gas Tungsten inert gas Plasma arc Submerged arc Electro-slag (ii). Gas Welding Oxy-acetylene Air-acetylene Oxy-hydrogen (iii). Resistance Welding Butt Spot Seam 1/21/2011 © ABHINAV 6 (iv)Thermit Welding (v)Solid State Welding Friction Ultrasonic Diffusion Explosive (vi)Non-conventional Welding Electron-beam Laser

What is arc welding? : 

What is arc welding? Arc welding is most commonly used to join two pieces of metal An electric arc is created that melts the base metals and filler metal (consumable) together so that they all fuse into one solid piece of metal. 1/21/2011 © ABHINAV 7 Steel Pipe – Tack Welded Root Pass or “Stringer Bead” Final weld after several beads are made

Fusion Welding Five Factors Which Determine The Quality Of The Weld : 

Fusion Welding Five Factors Which Determine The Quality Of The Weld 1/21/2011 © ABHINAV 8 Heat Angle Manipulation Distance Speed

Arc welding : 

Arc welding 1/21/2011 © ABHINAV 9 Advantages Most efficient way to join metals Lowest-cost joining method Affords lighter weight through better utilization of materials Joins all commercial metals Provides design flexibility Limitations Manually applied, therefore high labor cost. Need high energy causing danger Not convenient for disassembly. Defects are hard to detect at joints.

Inert Gas Welding : 

Inert Gas Welding For materials such as Al or Ti which quickly form oxide layers, a method to place an inert atmosphere around the weld puddle had to be developed 1/21/2011 © ABHINAV 10

Metal Inert Gas (MIG) : 

Metal Inert Gas (MIG) Uses a consumable electrode (filler wire made of the base metal) Inert gas is typically Argon 1/21/2011 © ABHINAV 11 POWER SOURCE ARC COLUMN BASE METAL PUDDLE SHIELDING GAS

Tungsten Inert Gas (TIG) : 

Tungsten Inert Gas (TIG) Tungsten electrode acts as a cathode A plasma is produced between the tungsten cathode and the base metal which heats the base metal to its melting point Filler metal can be added to the weld pool 1/21/2011 © ABHINAV 12

Types of weld: Shape : 

Types of weld: Shape 1/21/2011 © ABHINAV 13 Surface Groove Fillet Plug Slot

Why to learn welding? : 

Why to learn welding? Welding is so HOT …. it’s COOL! Welding can help build a successful career. Skilled welders are in demand – people use things that are welded everyday! Welding can be fun and safe! It is challenging and high-tech. 1/21/2011 © ABHINAV 14

Carrier in welding : 

Carrier in welding Job opportunities in welding are changing … Welding can be valuable as a job skill or as a full-time job 1/21/2011 © ABHINAV 15 Engineering Racing Production Welding Military Teaching Maintenance Robotics Auto Technician

The AMERICAN WELDING SOCIETY : 

The AMERICAN WELDING SOCIETY 1/21/2011 © ABHINAV 16 Who is the AWS? American Welding Society It is a non-profit organization whose membership includes: Individuals Students Companies What do they do? Their purpose is to: Advance the science, technology, and application of welding and allied processes including: joining, brazing, soldering, cutting, and thermal spray Standardize classification of electrode and base material codes Standardize process procedures Provide welding certification

TYPES OF JOINTS : 

TYPES OF JOINTS 1/21/2011 © ABHINAV 17 Butt Corner Lap Edge T

Welding Positions : 

Welding Positions 1/21/2011 © ABHINAV 18 INCREASING DIFFICULTY FLAT HORIZONTAL VERTICAL OVERHEAD

WELDING SYMBOLS : 

WELDING SYMBOLS BUTT JOINT 1/21/2011 © ABHINAV 19

FILLET JOINT: WELD SYMBOL : 

FILLET JOINT: WELD SYMBOL 1/21/2011 © ABHINAV 20

CORNER JOINT: WELD SYMBOL : 

CORNER JOINT: WELD SYMBOL 1/21/2011 © ABHINAV 21

Application of welding : 

Application of welding Automobile Ships & marine Airplane Doors & furniture Boilers Manufacturing etc. 1/21/2011 © ABHINAV 22

Safety: : 

Safety: Welding can be safe when sufficient measures are taken to protect yourself and others from potential hazards. 1/21/2011 © ABHINAV 23

Safety : 

Safety 1/21/2011 © ABHINAV 24 Protect yourself and others from potential hazards including: Fumes and Gases Electric Shock Arc Rays Fire and Explosion Hazards Noise Hot objects

Queries?? : 

Queries?? 1/21/2011 © ABHINAV 25 ??

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