Aluminum Welding Wire Consumable

Aluminum always has an oxide layer that melts much higher than the base material. You have to remove it mechanically before welding, otherwise you won't get a clean bond. The filler material contains elements that break up the oxide and calm the melt. Watch for a clean, even wire feed, otherwise the arc flickers and you'll draw pores. If the weld solidifies too fast, it tends to crack – so don't put too much heat in and keep the weld clean.