Weldmatic 350i + Weldmatic 500i
Model No CP139, CP140
17
1
3
2
4
Fig 5
Lift TIG Operation Procedure
LIFT TIG Operation
LIFT TIG arc start can be achieved with the
following procedure.
1 Turn on the shielding gas.
2 Touch the electrode lightly against the
work piece.
2 Press the torch trigger switch (if in
remote mode). The shielding gas will
start to flow and a small current will pass
through the electrode.
4 While still holding the electrode against
the work piece, roll the hand piece over
until the cup rests on the work piece.
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.
Duty Cycle
The term duty cycle indicates the percentage
welding time available at the rated output
current, for each 10 min period over 4 hours.
The Weldmatic 350i is rated at 350 Amps,
and the 500i at 500 Amps, 60% duty cycle.
If the machine is operated at a reduced
welding current, a higher duty cycle is
available. The diagram below illustrates the
appropriate duty cycle rating for the range of
welding currents available, and so allows the
maximum welding time per 10 minute period
to be determined.
The power source is protected by in built
over temperature protection devices. These
will operate if the machine is operated in
excess of its current and duty cycle rating.
If this occurs, the temperature warning
indicator will be on, the fan will continue to
run, but the machine will not deliver welding
current until the unit has cooled sufficiently.
Fig 6
Duty Cycle Rating
Maximum welding
time per 10 min
500
150 200 250
350
300
400 450
