Tweco FP-165 Mini MIG Portable MIG Welder - Manual (Page 47)

SERVICE FIREpOwER Fp-125, 135, 165
Service 5-3 Manual 0-5123
5.05 Welding Problems
FAULT CAUSE REMEDY
1 Undercut.
A Welding arc voltage
too high.
A Reduce voltage by reducing the voltage se-
lection switch position or increase the wire
feed speed.
B Incorrect torch angle B Adjust angle
C Excessive heat input C Increase the torch travel speed and/or reduce
welding current by reducing the voltage selec-
tion switch position or reducing the wire feed
speed.
2 Lack of penetration.
A Welding current too
low
A Increase welding current by increasing wire
feed speed and increasing voltage selection
switch position.
B Joint preparation too
narrow or gap too
B Increase joint angle or gap
C Shielding gas incor-
rect
C Change to a gas which gives higher penetra-
tion
3 Lack of fusion. Voltage too low Increase voltage by increasing voltage selec-
tion switch position.
4
Excessive spatter.
A Voltage too high A Lower voltage by reducing the voltage selec-
tion switch or increase wirespeed control.
B Voltage too low B Raise voltage by increasing the voltage selec-
tion switch or reduce wirespeed control.
5 Irregular weld shape. A Incorrect voltage and
current settings. Con-
vex = voltage too low.
Concave = voltage too
high.
A Adjust voltage and current by adjusting the
voltage selection switch and the wirespeed
control.
B Wire is wandering B Replace contact tip
C Incorrect shielding
gas
C Check shielding gas
D Insufficient or exces-
sive heat input
D Adjust the wirespeed control or the voltage
selection switch
Table 5-1a: Welding Problems