6
CONSUMABLES – SHIELDING GAS &
ELECTRODE WIRES The
shielding gases and wires used for mig spot welding are the same as that used
for continuous mig welding
in all plate materials. Refer to Chapters 5 and 6 for specific recommendations.
However, when spot welding
mild steel, it is now more important to use a wire that contains a substantial
level of deoxidizers. Because
spot welding times can be as short as 0.3 sec., (18 cycles) the solidification
of the weld bead is extremely
fast. The wire must contain deoxidizers to insure that the deposited weld nugget
is sound.
