Tweco 300 DC Arcmaster - Manual (Page 53)

ARCMASTER 300 ACDC
February 22, 2006 10-3
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.
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.
Description Possible Cause Remedy
C C Gas flow rate is too high.
Table 10-1 (continued): TIG Welding Problems