1 , before welding it is necessary to make the appropriate surface cleaning of welded joints is best oblique cut a U-shaped groove .2, the only hole to play at both ends of the crack Aluminium Alloy Welding Wire expansion of cracks during welding .3 , repair bad angle , you can choose WE100 cold welding to form an effective U- slotted or V-shaped groove.4 , the welding current as small as possible , medium arc length , slightly tilted to the welding direction .5 , the proposed use of the weld bead short , thin and narrow lateral swinging torch , welding before stopping to fill the crater , usually carried out withoutHeat treatment, allow the parts to cool down slowly .