Welding Problems - Thermal Arc Fabricator 140 Service Manual

BASIC TROUBLESHOOTING

5.05 Welding Problems

FAULT
1 Undercut.
2 Lack of penetration.
3 Lack of fusion.
4 Excessive spatter.
5 Irregular weld shape. A Incorrect voltage
January 25, 2008
CAUSE
A Welding arc voltage
too high.
B Incorrect torch
angle
C Excessive heat input C Increase the torch travel speed and/or
A Welding current too
low
B Joint preparation
too narrow or gap
i h
C Shielding gas
incorrect
Voltage too low
A Voltage too high
B Voltage too low
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
Table 5-1a: Welding Problems
5-3
FABRICATOR 140, 180
REMEDY
A Reduce voltage by reducing the voltage
selection switch position or increase the
wire feed speed.
B Adjust angle
reduce welding current by reducing the
voltage selection switch position or
reducing the wire feed speed.
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
Increase voltage by increasing voltage
selection switch position.
A Lower voltage by reducing the voltage
selection switch or increase wirespeed
control.
B Raise voltage by increasing the voltage
selection switch or reduce wirespeed
control.
A Adjust voltage and current by adjusting
the voltage selection switch and the
wirespeed control.
B Replace contact tip
C Check shielding gas
D Adjust the wirespeed control or the
voltage selection switch
Manual 0-4992