Different Welding Processes Pdf

Welding is a material joining process performed by application of heat with or without pressure and addition of filler material. The applications of welding are so varied and extensive that it would be no exaggeration to say that there is no metal industry and no branch of engineering science that does not make use of welding in one form or another. Varying from small scale industry to large scale industry and from small machines to large machineries, welding is applied everywhere. Construction of large ships, bridges, huge buildings, railways, roadways, automotive and aircraft construction, pipe lines, tanks and vessels, machinery parts depend a lot on welding technology.

The Classification of Welding ProcessesModern methods of welding can be classified, depending on the state of the material during welding (plastic or molten state), as follows:. Plastic welding or pressure welding (explained below). Fusion welding or nonpressure welding (explained below)They can also be classified, depending on the source of heat, as follows:1. Gas welding.

Oxy acetylene or hydrogen welding (explained below). Air acetylene welding2. Arc welding explained below). Carbon arc welding. Metal arc welding.

Welding Types And Definitions

Gas metal arc welding (MIG). Plasma arc welding.

Electro slag welding (explained below). Submerged arc welding. Flux cored arc welding. Gas tungsten arc welding (TIG). Atomic hydrogen arc welding3.

Resistance welding (explained below). Butt welding. Resistance butt welding. Spot welding. Seam welding.

Projection welding. Percussion welding4. Thermit welding (explained below)5. Solid state welding. Friction welding (explained below).

Ultrasonic welding (explained below). Diffusion welding (explained below). Explosive welding (explained below). Cold welding ( explained below). Forge welding6. New welding processes. Electron beam welding (explained below).

Types Of Welding Pdf In Hindi

Laser beam welding (explained below)Related Processes. Arc weld. Hard pressing weld. Oxy acetylene cutting. Brazing. SolderingSome of the most important welding processes are explained below:.

Welding Processes Explained

Plastic welding or pressure welding:In this process, the piece of metal to be joined is heated to a plastic state and then forced together by external pressure. Fusion welding or nonpressure welding:In this type of welding method, the material at the joint is heated to a molten state and allowed to solidify. This include gas weld, arc weld etc. Oxy fuel gas welding:In this type of welding, the heat is produced by a gas flame which is used for melting the base and the filler metal. This results in the formation of a weld between the two metals.

The fuel gas may be acetylene or hydrogen and this is mixed with proper proportion of oxygen. In this laser beam welding method, metals are joined by impinging a concentrated coherent light beam upon the surface to be joined. Explosive welding:Explosive welding is the solid state welding process in which the coalescence is obtained by a high velocity movement of the parts to be joined, produced by a controlled detonation. Ultrasonic welding:Ultrasonic welding is a solid state welding process in which the coalescence is obtained by the application of high frequency vibratory energy as the work parts are held together under pressure.