ESAB Caddyt Arc 150i Service Manual page 58

CaddyTig 150
2 stroke
Functions when using 2 stroke control of the welding torch.
In the 2 stroke control mode, pressing the trigger switch starts gas pre--flow (if used) and
strikes the arc (1). The current rises to the set value (as controlled by the slope up function,
if in operation). Releasing the trigger switch (2) reduces the current (or starts slope down if
in operation) and extinguishes the arc. Gas post--flow follows if it is in operation.
4 stroke
Functions when using 4 stroke control of the welding torch.
In the 4 stroke control mode, pressing the trigger switch starts gas pre--flow (if used) (1). At
the end of the gas pre--flow time, the current rises to the pilot level (a few ampere), and the
arc is struck. Releasing the trigger switch (2) increases the current to the set value (with
slope up, if in use). At the end of welding, the welder presses the trigger switch again (3),
which reduces the current to pilot level again (with slope down, if in use). Releasing the
switch again (4) extinguishes the arc and starts gas post--flow.
HF
The HF function strikes the arc by means of a spark from the electrode to the workpiece.
LiftArct
The Lift Arct function strikes the arc when the electrode is brought into contact with the
workpiece and then lifted away from it.
Striking the arc with the LiftArc function. Step 1: the electrode is touched on to the workpiece. Step 2:
the trigger switch is pressed, and a low current starts to flow. Step 3: lift the electrode from the
workpiece: the arc strikes, and the current rises automatically to the set value.
S0740 800 161/E061205/P66
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