Tweco 300 MST Arcmaster - Manual (Page 48)

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Description Possible Cause Remedy
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 cannot 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.