Full Product Manual
82
Characteristics: Concave weld, poor lling, possible
undercutting resulting in weak weld.
Possible Causes: Voltage too high, not enough wire
speed, too short of wire stick out, wrong gun angle.
Remedy: Decrease voltage, use push motion, in-
crease wire speed.
Characteristics: Small Convex weld possibly with
bulging sides/cold lap and/or an inconsistent arc.
Possible Causes: Not enough Voltage or Amperage. If
weld is ropy and thin without bulging at the toes,
travel speed is too fast or using a pull technique.
Remedy: Increase voltage and amperage, slow down
to ll joint more. Use push technique.
Characteristics: Large convex weld with bulging at
toes, weld legs exceed thickness of the metal being
welded.
Possible Causes: Not enough voltage, too much wire
speed, overlling due to too slow of forward travel
speed, and/or poor weaving technique.
Remedy: Increase voltage, increase forward travel
speed, reduce weaving width.
Proper Weld Characteristics: Weld is slightly convex,
weld legs (vertical and horizontal width of weld) are
equal in length and match the thickness of the metal
being welded. No traces of undercutting, Proper tie in
of the weld at the toes with no cold lap. Weld is not
overlled or under-lled with no signicant amounts of
spatter, soot or contaminates around weld. Weld is
not oxidized and is bright.
NO
NO
NO
YES
MIG OPERATION AND THEORY
Section 3 Basic Theory and Function