MIG welding is a kind of arc welding that uses a metal electrode to match the alloy
of the work section and an inert gas to transfer oxygen from the weld region. MIG welding is the most suitable welding technique for aluminum, with the exception of particularly thin aluminum sheeting. MIG welding aluminum needs more practice and skill than welding steel.
Prepare the surfaces of the aluminum elements by cleaning the exterior with a solvent, then using the wire brush to remove any oxides. This removes any constituent part and impurities and prevents them from becoming trapped in the weld.
Clutch the electrode at a 10- to 15-degree angle from the vertical, sharp toward the way of the weld. It is significant to use the push process when MIG welding aluminum. The pull process would prevent the argon gas from sufficiently covering the weld, resulting in an inconsistent weld.
Make a pool of molten aluminum with the electrode and gradually push the electrode forward. Regulate the voltage of the welding machine to get spray transfer of the aluminum electrode. In spray transfer, the electrode release small droplets of the metal into the weld. This will results in a smooth weld and the droplets do not get in the way with the electrode arc.
Adjust the movement speed of the electrode as the aluminum work part heats up to retain a consistent weld width. If a big fillet weld is requisite, make several thin passes as different to one thick pass, which has the potential to burn through the material.