Forced Interruption - ESAB Aristotig 405 AC/DC Instruction Manual

GB
5.7.2 Setting, DC and AC
Setting of the desired welding current type using the welding current selection switch (22).
5.7.2.1 Direct current
When DC welding, the electrode (TIG- and electrode welding) is connected to the
negative pole and the return cable to the positive pole.
5.7.2.2 Alternating current
Connect as for DC configuration. Two different AC types can be selected using the
welding current selector (22).
• A square alternating current is distinguished by a stable arc, although, it causes a
higher working noise.
• The sinusoidal type provides the user with an alternating current curve with less noise.
Using the rotary switch AC frequency (19), the frequency is progressively adjustable from
50 up to 200 Hz. A higher AC frequency results in a more concentrated and a more stable
arc.
It is suitable for lower currents and for welding thin plates.
Using the rotary switch AC balance (21), the balance can be varied between positive and
negative half cycles.
A balance shift in the positive direction causes a higher cleaning effect. A shift in the
negative direction causes a higher penetration.
5.8

Forced interruption

When the torch button or the foot operated remote control is activated, but no arc is
generated, the open-circuit voltage is turned off automatically after 2 seconds. It will also
turn off, when the arc is lost.
The arc can be started again by releasing the torch button and activating it again.
This function prevents:
• Uncontrolled arc ignition
• Material damage
• Protective gas leakage
• Accidents
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