Tweco 400 TS Arcmaster - Manual (Page 47)

40
Description Possible Cause Remedy
8 Electrode melts or
oxidizes 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.
9 Poor weld finish. Inadequate shielding gas. Increase gas flow or check gas
line for gas flow problems.
10 Arc flutters during TIG
welding.
A Tungsten electrode is too large
for the welding current.
A Select the right size electrode.
Refer to Basic TIG Welding
Guide.
B Absence of oxides in the
weld pool.
B Refer Basic TIG Welding Guide
for ways to reduce arc flutter.
11 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.
12 Arc start is not smooth. A Tungsten electrode is too large
for the welding current.
A Select the right size electrode.
Refer to Basic TIG Welding Guide.
B The wrong electrode is being
used for the welding job.
B Select the right electrode type.
Refer to Basic TIG Welding Guide.
C Gas flow rate is too high. C Select the correct rate for the
welding job.
Refer to Basic TIG Welding Guide.
D Incorrect shielding gas is
being used.
D Select the right shielding gas.
Refer to Basic TIG Welding
Guide.
E Poor work clamp connection
to work piece.
E Improve connection to
work piece.