Weldtronic TM250C Operating Manual page 35

Possible causes
Work piece dirty.
Improper welding technique.
Insufficient heat input.
Possible causes
Excessive heat input.
Possible causes
Welding wire extends too far out of
nozzle.
Unsteady hand.
TitanMig AU 250C Manual_ Issue A 0415
Incomplete fusion
Failure of weld metal to fuse completely with
base metal or a preceding weld bead.
Remove all grease, oil, moisture, rust, paint, undercoating, and
dirt from work surface before welding.
Place stringer bead in correct location(s) at joint during
welding.
Adjust work angle or widen groove to access bottom during
welding.
Momentarily hold arc on groove side walls when using weaving
technique.
Keep arc on leading edge of weld puddle.
Use correct gun angle of 0 to 15 degrees.
Select higher wire feed speed and/or select higher voltage
range.
Burn-through
Weld metal melting completely through base metal resulting in
holes where no metal remains.
Select lower voltage range and reduce wire feed speed.
Increase and/or maintain steady travel speed.
Incomplete fusion
Weld metal that is not parallel and does not cover
joint formed by base metal.
Be sure welding wire extends no more than ½ in beyond
nozzle.
Support hand on solid surface or use two hands.
Corrective actions
Corrective actions
Corrective actions
31