Weld Quality Problems - Weldclass WeldForce WF-205MST Operating Instructions Manual

11.12.3

Weld Quality Problems

Other weld problems can be reduced by checking the following points.
Fault
Undercut
Figure 48
Lack of penetration
Figure 49
Lack of fusion
Figure 50
Excessive spatter
Figure 51
Irregular weld shape
Weld cracking
Figure 52
Troubleshooting – MIG Weld Quality
Cause
Welding arc voltage too high
Incorrect torch angle
Excessive heat input
Welding current too low.
Joint preparation too narrow or gap
too tight.
Shielding gas incorrect.
Voltage too low
Voltage too high
Voltage too low.
Incorrect voltage and
settings.
Convex, voltage too low.
Concave, voltage too high.
Wire is wandering.
Incorrect shielding gas.
Insufficient or excessive heat input.
Weld bead is too small.
Weld penetration narrow and deep. Reduce current and voltage and
Excessive weld stresses.
Excessive voltage.
Cooling rate too fast.
© Weldclass 2019 | E.&O.E. | Edition 2.1
Remedy
Decrease voltage or increase
the wire feed speed.
Adjust angle.
Increase the torch travel speed
and/or decrease
current by
voltage or decreasing the wire
feed speed.
Increase welding current by
increasing wire feed speed and
increasing voltage.
Increase joint angle or gap.
Change to a gas which gives
higher penetration.
Increase voltage
Decrease voltage or increase
the Current
control/
Increase the
decrease Current (Wire Speed)
current Adjust voltage and current by
adjusting the voltage control
and the Current (Wire Speed)
control
Replace contact tip.
Check shielding gas.
Adjust the Current (Wire Speed)
control or the voltage control.
Decrease travel speed.
increase MIG torch travel speed
or select a lower penetration
shielding gas.
Increase weld metal strength or
revise design.
Decrease voltage.
Slow the cooling rate by
preheating part to be welded or
cool slowly.
WF-205
MST
welding
decreasing the
(Wire Speed)
voltage or
51