Weldtronic TM250C Operating Manual page 34

Possible causes
Excessive heat input.
Possible causes
Improper joint preparation.
Improper welding technique.
Insufficient heat input.
Possible causes
Excessive heat input.
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feeder or liner.
Excessive penetration
Weld metal melting through base metal and hanging
underneath it.
Select lower voltage range and reduce wire feed speed.
Increase travel speed.
Lack of penetration
Shallow fusion between weld metal and base metal.
Material too thick. Joint preparation and design must provide
access to bottom of groove while maintaining correct welding
wire extension and arc characteristics.
Maintain normal gun angle of 0 to 15 degrees to achieve
maximum penetration.
Keep arc on leading edge of weld puddle.
Be sure welding wire extends no more than ½ in beyond
nozzle.
Select higher wire feed speed and/or select higher voltage
range.
Reduce travel speed.
Distortion
Contraction of weld metal during welding that forces base
metal to move.
Select lower voltage range and reduce wire feed speed.
Increase travel speed.
Use restraint (clamp) to hold base metal in position.
Make tack welds along joint before starting welding operation.
Weld in small segments and allow cooling between welds.
Corrective actions
Corrective actions
Corrective actions