What advantages do MIG welders offer?
• Externally supplied gas or gas mixtures provide MIG welder shielding. • Metal is deposited only when the wire actually touches the work. • No metal is transferred across the arc during MIG welding. • Another method of MIG welding, spray transfer moves a stream of tiny molten droplets across the arc from the electrode to the weld puddle. Consumables: contact tips, shielding gas, welding wire. • A number of configurations • MIG welders utilize solid wire and require shielding • MIG welders use a solid wire and require an inert gas for shielding. • Flux-core welders use a hollow wire that has flux inside it. When heated, the flux forms a protective gas layer around the weld. The shielding is there to prevent air from getting to the weld and causing a variety of problems, such as oxidation to hydrogen embrittlement from oxygen and water vapor in the air. To read the original article please click: http://www.mig-welders-tig-welder.com/mig-welder/default.
