Thermal Arc C/W VFE 4C HS III, Operation Manual

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10.03 Welding Problems
FAULT CAUSE REMEDY
1 Undercut. A. Welding arc voltage
too high.
B. Incorrect torch angle
C. Excessive heat input
A. Reduce voltage by reducing
the voltage selection switches
position or increase the wire
feed speed.
B. Adjust angle
C. Increase the torch travel
speed and/or reduce welding
current by reducing the voltage
selection switches position or
reducing the wire feed speed.
2 Lack of
penetration.
A. Welding current too
low
B. Joint preparation too
narrow or gap too tight
C. Shielding gas
incorrect
A. Increase welding current by
increasing wire feed speed
and increasing voltage
selection switch position.
B. Increase joint angle or gap
C. Change to a gas which
gives higher penetration
3 Lack of fusion. Voltage too low Increase voltage by increasing
voltage selection switches
position.
4 Excessive spatter. A. Voltage too high
B. Voltage too low
A. Lower voltage by reducing
the voltage selection switches
or increase wirespeed control.
B. Raise voltage by increasing
the voltage selection switches
or reduce wirespeed control.
5 Irregular weld
shape.
A. Incorrect voltage and
current settings.
Convex, voltage too low.
Concave, voltage too
high.
B. Wire is wandering
C. Incorrect shielding
gas
D. Insufficient or
excessive heat input
A. Adjust voltage and current
by adjusting the voltage
selection switches and the
wirespeed control.
B. Replace contact tip
C. Check shielding gas.
D. Adjust the wirespeed
control or the voltage selection
switches.
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