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Types Of Welding – Classification of welding processes

Jan 03, 2018

Types Of Welding – Classification of welding processes

Welding is a process of permanently joining two or more parts by the application of heat and (or) pressure. As per American Welding Society 50 different welding processes available today; some are very popular among the industries such as SMAW, GMAW, GTAW, SAW, FCAW etc. where as some are very specific and limited to few industries such as USW, RSW, DW etc.

Welding processes are broadly classified as fusion welding and solid state welding;

FUSION WELDING: In Fusion welding coalescence is done by melting the base metals by the application of heat. Very often filler metal is also used. Commonly used fusion welding processes are:

1. Arc Welding

SMAW (Shielded Metal Arc Welding or stick Welding)

GMAW (Gas Metal Arc Welding or MIG welding)

GTAW (Gas Tungsten Arc Welding or TIG Welding) SAW (Submerged Arc Welding)

FCAW (Flux Cored ARC Welding)

PAW (Plasma Arc Welding)

Carbon Arc Welding 

Stud Welding

2. Resistance Welding

Resistance Spot Welding

Resistance Seam Welding

Resistance Projection Welding

Flash Welding

3. Oxyfuel welding

4. Others

Electron beam welding

Laser beam Welding

SOLID STATE WELDING: In solid state welding, joining is done by the application of pressure alone or a combination of pressure and heat. Normally the base metal is not reached to the melting point, if heat is applied to obtain the coalescence and filler metal is not used. Some of the solid state welding processes are:

1. Diffusion welding (DFW)

2. Friction welding (FRW)

3. Ultrasonic welding (USW)

4. Cold Welding

5. Forge welding

6. Explosion welding (EXW)

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