The only difference between all GMA welding machines and some FCA welding machines is that all GMA welding machines must have a ______________.

Question

Quizplus · Accepted Answer

GMA welding machines utilize a shielding gas, which is controlled by a solenoid valve, to protect the weld pool from atmospheric contamination. FCA welding machines may or may not require a shielding gas depending on the specific application, so not all of them necessarily have a solenoid valve. The other options listed are common features of welding machines in general, but do not specifically differentiate between GMA and FCA machines.

The Only Difference Between All GMA Welding Machines and Some