Tweco 211i Fabricator - Manual (Page 81)

BASIC WELDING FABRICATOR 211i
Manual 0-5157 4-21 BASIC WELDING
FAULT CAUSE REMEDY
7 Dirty weld pool A Electrode contaminated
by contact with work
piece or filler rod mate-
rial.
A Clean the electrode by grinding off the
contaminates.
B Work piece surface has
foreign material on it.
B Clean surface.
C Gas contaminated with
air.
C Check gas lines for cuts and loose fitting
or change gas cylinder.
8 Poor weld finish Inadequate shielding
gas.
Increase gas flow or check gas line for
gas flow problems.
9 Arc start is not smooth. A Tungsten electrode is
too large for the weld-
ing current.
A Select the right size electrode. Refer to
Tweco Electrode Selection Chart.
B The wrong electrode
is being used for the
welding job.
B Select the right electrode type. Refer to
Tweco Electrode Selection Chart.
C Gas flow rate is too
high.
C Select the right rate for the welding job.
Refer to Table 4-9.
D Incorrect shielding gas
is being used.
D Select the right shielding gas.
E Poor work clamp con-
nection to work piece.
E Improve connection to work piece.
10 Arc flutters during TIG
welding.
Tungsten electrode is
too large for the weld-
ing current.
Select the right size electrode. Refer to
Tweco Electrode Selection Chart.
11 Tungsten blackens due to
lack of shielding gas
A Gas valve on the TIG
Torch has not been
turned ON.
A Turn ON TIG Torch gas valve before you
commence welding.
B Gas cylinder valve OFF
or TIG Torch hose not
connected to regulator.
B Turn ON gas cylinder valve or connect TIG
Torch hose to regulator.
Table 4-10: TIG (GTAW) Welding Problems