Tweco 186 DC Inverter - Manual (Page 69)

BASIC WELDING 186 AC/DC INVERTER
Manual 0-5237 4-15 BASIC WELDING GUIDE
4.04 TIG (GTAW) Welding Problems
FAULT CAUSE REMEDY
1 Excessive bead build up or
poor penetration or poor
fusion at edges of weld.
Welding current is too
low
Increase weld current and/or faulty joint
preparation.
2 Weld bead too wide and
flat or undercut at edges
of weld or excessive burn
through.
Welding current is too
high
Decrease weld current.
3 Weld bead too small or
insufficient penetration or
ripples in bead are widely
spaced apart.
Travel speed too fast Reduce travel speed.
4 Weld bead too wide or
excessive bead build up or
excessive penetration in
butt joint.
Travel speed too slow Increase travel speed.
5 Uneven leg length in fillet
joint
Wrong placement of
filler rod
Re-position filler rod.
6 Electrode melts or oxidises
when an arc is struck.
A Torch lead connected
to positive welding
terminal.
A Connect torch lead to negative welding
terminal.
B No gas flowing to weld-
ing region.
B Check the gas lines for kinks or breaks
and gas cylinder contents.
C Torch is clogged with
dust or dirt.
C Clean torch.
D Gas hose is cut. D Replace gas hose.
E Gas passage contains
impurities.
E Disconnect gas hose from the rear of
Power Source then raise gas pressure
and blow out impurities.
F Gas regulator turned
off.
F Turn on.
G The electrode is too
small for the welding
current.
G Increase electrode diameter or reduce the
welding current.
H Power source is set for
STICK welding.
H Set Power Source to LIFT TIG or HF TIG
mode.