Tig Welding Troubleshooting - Weldclass Weldforce 210MST Operating Instructions Manual

13.2 TIG Welding Troubleshooting

Fault
Excessive bead build up or
poor penetration or
poor fusion at edges of weld
Weld bead too wide and flat or
undercut at edges of weld or
excessive burn through
Weld bead too small or
insufficient penetration or
ripples in bead are widely
spaced apart.
Weld bead too wide or
excessive bead build up or
excessive penetration in butt
joint.
Uneven leg length in fillet joint Wrong placement of filler rod.
Electrode melts or oxidises
when an arc in struck
Dirty weld pool
Poor weld pool
Arc start is not smooth.
Arc flutters during TIG welding. Tungsten electrode is too large
Table 31
74
Troubleshooting – TIG Weld quality
Cause
Welding current is too low.
Welding current is too high.
Travel speed too fast.
Travel speed too fast.
Torch lead connected to positive
welding terminal.
No gas flowing to welding
region.
Torch is clogged with dust or dirt. Clean torch.
Gas hose is cut.
Gas passage contains impurities. Disconnect gas hose from the rear
Gas regulator turned off.
Torch electrode is too small for
the welding current.
Electrode contaminated
contact with work piece or filler
rod material.
Work piece surface has foreign
material on it.
Gas contaminated with air.
Inadequate shielding gas.
Tungsten electrode is too large
for the welding current.
The wrong electrode is being
used for the welding job.
Gas flow rate is too high.
Incorrect shielding gas is being
used.
Poor Work Lead/Clamp
connection to work piece.
for the welding current.
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Remedy
Increase weld current and/or faulty
joint preparation
Decrease weld current.
Decrease weld current.
Increase travel speed.
Re-position rod.
Connect torch lead to negative
welding terminal.
Check the gas lines for kinks or
breaks and gas cylinder contents.
Replace gas hose.
of Power Source then raise gas
pressure and blow out impurities.
Turn on.
Increase electrode diameter or
reduce the welding current.
by Clean the electrode by grinding off
any contaminates.
Clean surface.
Check gas lines for cuts and loose
fitting or change gas cylinder.
Increase gas flow or check gas line
for gas flow problems.
Select the right size electrode.
Select the right electrode type.
Select the right rate for the welding
job.
Select the right shielding gas.
Improve connection to work piece.
Select the right size electrode.
.