Answer :
Final answer:
Arc welding processes such as MIG and FCAW use a constant voltage power source, whereas gas welding, laser welding, and resistance welding operate differently and don't use constant voltage.
Explanation:
Welding processes that use a constant voltage power source primarily include certain types of arc welding, such as Gas Metal Arc Welding (GMAW) more commonly known as MIG welding, and Flux Cored Arc Welding (FCAW). These processes maintain a constant voltage level during welding to create a stable arc and consistent weld. Both gas welding and laser welding do not typically use a constant voltage power source. Gas welding uses a flame produced by burning fuel gases in oxygen, while laser welding utilizes a concentrated beam of light. Resistance welding differs as well, as it relies on electrical resistance and the application of pressure to join materials together without a consumable electrode or filler material.
