Specifications

Transtig 200Pi, 250Pi, 300Pi
37
Description Possible Cause Remedy
3 Electrode melts or
oxidises when an arc
is struck.
A No gas flowing to welding region. A Check the gas lines for kinks or
breaks and gas cylinder contents.
B Torch is clogged with dust. B Clean torch
C Gas hose is cut. C Replace gas hose.
D Gas passage contains impurities. D Disconnect gas hose from torch
then raise gas pressure and blow
out impurities.
E Gas regulator turned off. E Turn on.
F Torch valve is turned off. F Turn on.
G The electrode is too small for the
welding current.
G Increase electrode diameter or
reduce the welding current.
4 Poor weld finish. Inadequate shielding gas. Increase gas flow or check gas line
for gas flow problems.
5 Arc flutters during
TIG welding.
Tungsten electrode is too large for
the welding current.
Select the right size electrode.
Refer to Table 9.
6 Welding arc can not
be established.
A Work clamp is not connected to the
work piece or the work/torch leads
are not connected to the right
welding terminals.
A Connect the work clamp to the
work piece or connect the
work/torch leads to the right
welding terminals.
B Torch lead is disconnected. B
Connect it to the ‘−‘ terminal.
C Gas flow incorrectly set, cylinder
empty or the torch valve is off.
C Select the right flow rate, change
cylinders or turn torch valve on.
7 Arc start is not
smooth.
A Tungsten electrode is too large for
the welding current.
A Select the right size electrode.
Refer to Table 9.
B The wrong electrode is being used
for the welding job
B Select the right electrode type.
Refer to Table 10.
C Gas flow rate is too high. C Select the correct rate for the
welding job.
Refer to Table 11.
D Incorrect shielding gas is being
used.
D Select the right shielding gas.
Refer to Table 13.
E Poor work clamp connection to
work piece.
E Improve connection to work piece.
16.2 Stick Welding Problems
Description Possible Cause Remedy
1 Gas pockets or voids in
weld metal (Porosity).
A
B
C
Electrodes are damp.
Welding current is too high.
Surface impurities such as oil,
grease, paint, etc.
A
B
C
Dry electrodes before use.
Reduce welding current.
Clean joint before welding.
2 Crack occurring in
weld metal soon after
solidification
commences
A
B
C
Rigidity of joint.
Insufficient throat thickness.
Cooling rate is too high.
A
B
C
Redesign to relieve weld joint of
severe stresses or use crack
resistance electrodes.
Travel slightly slower to allow
greater build up in throat.
Preheat plate and cool slowly.