List of welding processes
This is a list of welding processes, separated into their respective categories. The associated N reference numbers are specified in ISO 4063. Numbers in parentheses are obsolete and were removed from the current version of ISO 4063. The AWS reference codes of the American Welding Society are commonly used in North America.
Arc welding
Overview article: arc welding| Name | N | AWS | Characteristics | Applications |
| Bare Metal Arc Welding | BMAW | Consumable electrode, no flux or shielding gas | Historical | |
| Carbon Arc Welding | CAW | Carbon electrode, historical | Copper, repair | |
| Flux Cored Arc Welding | 136 138 | FCAW FCAW-S | Continuous consumable electrode filled with flux | Industry, construction |
| Gas Metal Arc Welding | 131 135 | GMAW | Continuous consumable electrode and shielding gas | Industry |
| Gas Tungsten Arc Welding | 141 | GTAW | Nonconsumable electrode, slow, high quality welds | Aerospace, Construction, Tool and Die |
| Plasma Arc Welding | 15 | PAW | Nonconsumable electrode, constricted arc | Tubing, instrumentation |
| Shielded Metal Arc Welding | 111 | SMAW | Consumable electrode covered in flux, can weld any metal as long as they have the right electrode | Construction, outdoors, maintenance |
| Submerged Arc Welding | 121 | SAW | Automatic, arc submerged in granular flux | |
| Magnetically Impelled Arc Butt Welding | 185 | MIAB | Both tube ends are electrodes; no protection gas; arc rotates fast along edge by applied magnetic field | Pipelines and tubes |
| Atomic Hydrogen Welding | AHW | Two metal electrodes in hydrogen atmosphere | Historical |
Oxyfuel gas welding
Overview article: Oxy-fuel welding and cutting| Name | N | AWS | Characteristics | Applications |
| Air acetylene welding | AAW | Chemical welding process, not popular | Limited | |
| Oxyacetylene welding | 311 | OAW | Combustion of acetylene with oxygen produces high-temperature flame, inexpensive equipment | Maintenance, repair |
| Oxygen/Propane welding | 312 | Gas welding with oxygen/propane flame | ||
| Oxyhydrogen welding | 313 | OHW | Combustion of hydrogen with oxygen produces flame | Limited |
| Pressure gas welding | PGW | Gas flames heat surfaces and pressure produces the weld | Pipe, railroad rails |
Resistance welding
Overview article: electric resistance welding| Name | N | AWS | Characteristics | Applications |
| Resistance spot welding | 21 | RSW | Two pointed electrodes apply pressure and current to two or more thin workpieces | Automobile industry, Aerospace industry |
| Resistance seam welding | 22 | RSEW | Two wheel-shaped electrodes roll along workpieces, applying pressure and current | Aerospace industry, steel drums, tubing |
| Projection welding | 23 | PW | Semi-Automatic, Automatic, Welds are localized at predetermined points. | |
| Flash welding | 24 | FW | ||
| Upset welding | 25 | UW | Butt joint surfaces heated and brought together by force |