Gasless MIG welder uses flux-cored welding wire instead of solid wire. The wire has a special chemical core (flux) that melts during welding and produces a protective gas shield around the weld pool, so no external shielding gas like CO2 or argon is needed.
How it works
The machine feeds flux-cored wire automatically through the welding gun
An electric arc melts the wire and the metal being joined
The flux inside the wire creates shielding gas and a protective slag layer
The slag cools on top of the weld and is later chipped off or brushed away