Weldmatic 200i + Weldmatic 250i
Model No CP137, CP138
21
TIG Welding Operation
Connect the Work Clamp to the work piece.
Turn on the power switch located on the rear
panel. Wait approximately 5 seconds as the
unit goes through its initiation sequence.
Press the Weld Mode button until the TIG
Mode light is on. The Weldmatic keeps the
last mode used in memory, so this step is
only necessary when using a different mode
to that used last.
Select an appropriate welding current for the
job by setting the knob on the machine front
panel.
To TIG Torch
Fig 9
Cable and hose connections for TIG welding
Work
clamp
(-) output
terminal
(+) output
terminal
2
4
3
5
Fig 10
Lift TIG Operation Procedure
LIFT TIG Operation
When the Welding mode is set to LIFT TIG
then the arc start can be achieved with the
following procedure.
1 Turn on the torch gas valve. Gas will start
to flow on torch.
2 Touch the electrode lightly against the
work piece. A small current will pass
through the electrode.
3 While still holding the electrode against
the work piece, roll the hand piece over
until the cup rests on the work piece.
4 Use the cup as a pivot point to roll the
hand piece over allowing the electrode to
lift of the work piece.
The arc will ignite.
5 Immediately lift the cup of the work
piece, the current will rise to the welding
level within the up-slope time.
Use of a copper striking plate can be used to
avoid electrode contamination. The electrode
can also be contaminated by contact with
the filler rod. A contaminated electrode
produces an unstable arc. If this occurs
regrind the electrode tip.