Murex Tradestig 150-1, User Manual

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7 WELDING
7.1 TIG welding
During TIG welding, the return cable must be connected to (+) and the TIG torch to
(--). If they are connected in reverse, the tungsten electrode will melt.
7.1.1 2--stroke
Gas pre--flow Slope
up
Slope down Gas post--flow
Functions when using 2--stroke control of the welding torch.
In the 2--stroke control mode, pressing the trigger switch starts gas pre--flow (0.5 sec)
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.
7.1.2 4--stroke
Gas pre--flow Slope
up
Slope down Gas post--flow
Functions when using 4--stroke control of the welding torch.
In the 4 --stroke control mode, pressing the trigger switch starts gas pre--flow (0.5 sec)
(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.
7.1.3 HF
The HF function strikes the arc by means of a spark from the tungsten electrode to
the workpiece as the electrode is brought closer to the workpiece.
GB