Welding is one of the manufacturing processes by which two or more similar or dissimilar materials can be joined permanently by coalescence formation with or without the applications of external pressure, heat or filler material. In order to join a wide variety of materials in various ways, a large number of welding processes have been developed, each having certain pros and cons over other. A list of commonly used welding processes along with their abbreviation is provided below.

List of arc welding processes

• Shielded Metal Arc Welding (SMAW)
• Gas Metal Arc Welding (GMAW)
• Tungsten Inert Gas (TIG) welding
• Submerged Arc Welding (SAW)
• Flux Cored Arc Welding (FCAW)
• Electro-Slag Welding (ESW)
• Electro-Gas Welding (EGW)
• Arc Stud Welding (SW)
• Carbon Arc Welding (CAW)
• Atomic Hydrogen Welding (AHW)

List of gas welding processes

• Air-Acetylene Welding (AAW)
• Oxy-Acetylene Welding (OAW)
• Oxy-Hydrogen Welding (OHW)
• Pressure Gas Welding (PGW)

List of resistance welding processes

• Resistance Spot Welding (RSW)
• Resistance Seam Welding (RSEW)
• Projection Welding (PW)
• Percussion Welding (PEW)
• Flash Welding (FW)
• Upset Welding (UW)

List of solid-state welding processes

• Cold Welding (CW)
• Roll Welding (ROW)
• Pressure Welding (PW)
• Diffusion Welding (DFW)
• Forge Welding (FOW)
• Friction Welding (FRW)
• Friction Stir Welding (FSW)
• Explosion Welding (EXW)
• Ultrasonic Welding (USW)

List of thermo-chemical welding processes

• Thermit Welding (TW)

List of intense energy beam welding processes

• Plasma Arc Welding (PAW)
• Electron Beam Welding (EBW)
• Laser Beam Welding (LBW)

List of plastic welding processes

• Hot gas welding
• Hot plate welding
• High frequency welding
• Ultrasonic welding
• Induction welding
• Friction welding
• High energy welding (laser)