
Gasless Welding Wire Vs Gas MIG Welding Wire
A MIG welder is usually designed for use with self-shielding wire (gasless), wire with gas or both (i.e. gas and gasless) and they are differentiated by the welding torch’s polarity. The torch must be negative if you want to make use of a self-shielding wire and must be positive if you use it with gas and solid wire.