Page 146 - Welding of Aluminium and its Alloys

MIG welding 131

(a)

(b)
7.14 (a) MIG, argon shielded, two pass, double sided, 12mm thick, flat
position. (b) MIG, argon shielded, 15mm leg length fillet, 12mm thick
plate, horizontal-vertical.

bead. The wider bead requires less critical positioning of the arc and assists
in avoiding missed edge and lack of penetration-type defects. The hotter,
slower cooling weld pool also allows hydrogen to diffuse from the molten
weld metal, making this a method that may be used to reduce the amount
of porosity. The increased heat also enables faster welding speeds to be