Tig (Gtaw) Welding Problems - Thermal Arc 211i Fabricator Operating Manual

FABRICATOR 211i

4.06 TIG (GTAW) Welding Problems

FAULT
1 Excessive bead build up or
poor penetration or poor
fusion at edges of weld.
2 Weld bead too wide and
flat or undercut at edges
of weld or excessive burn
through.
3 Weld bead too small or
insufficient penetration or
ripples in bead are widely
spaced apart.
4 Weld bead too wide or
excessive bead build up or
excessive penetration in
butt joint.
5 Uneven leg length in fillet
joint
6 Electrode melts or oxidizes
when an arc is struck.
BASIC WELDING
CAUSE
Welding current is too
low
Welding current is too
high
Travel speed too fast
Travel speed too slow
Wrong placement of
filler rod
A TIG Torch lead connect-
ed to positive welding
terminal.
B No gas flowing to weld-
ing region.
C TIG Torch is clogged
with dust or dirt.
D Gas hose is cut.
E Gas passage contains
impurities.
F Gas regulator turned
OFF.
G TIG Torch valve is
turned OFF.
H The electrode is too
small for the welding
current.
I Power source is set for
MIG welding.
4-20
REMEDY
Increase weld current and/or faulty joint
preparation.
Decrease weld current.
Reduce travel speed.
Increase travel speed.
Re-position filler rod.
A Connect TIG Torch lead to negative weld-
ing terminal.
B Check the gas lines for kinks or breaks
and gas cylinder contents.
C Clean TIG Torch.
D Replace gas hose.
E Disconnect gas hose from the rear of
Power Source then raise gas pressure
and blow out impurities.
F Turn ON.
G Turn ON.
H Increase electrode diameter or reduce the
welding current.
I Set Power Source to LIFT TIG mode.
BASIC WELDING
Manual 0-5157