gala gar GALA ELECTRONICS 221 ACDC Manuel Technique D'instructions page 41

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The following picture shows the positive wave interval ∆I that, if
subtracted and added to the negative wave, forms the new form of
broken line wave.
Consequences of a higher value:
− Tighter arc.
− Greater weld penetration.
− Reduced pickling.
− Loss of arc.
− Less deformation of the electrode.
AC frequency
The picture below shows the example where the wave on the second
graph has a double frequency compared with the first.
Consequences of a higher value:
− Arc concentration.
− Reduction of heat-affected zone.
− Reduction of heat-affected zone.
− Slower melt speed.
AC balance
This parameter establishes the positive wave vs. negative wave time
ratio.
The following figure shows two graphs with different balance value:
the first graph represents the curve of the current with a negative
value balance (more penetration) in which it can be seen that there is
a low percentage of positive wave compared with the negative.
In the second graph the current curve is shown with a positive value
balance (more cleaning); in this case the percentage of the positive
wave is greater than the negative one.
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GALA ELECTRONICS 221ACDC GALA ELECTRONICS 221ACDC GALA ELECTRONICS 221ACDC GALA ELECTRONICS 221ACDC
Consequences of a higher value:
− Greater weld penetration.
− Less cleanliness.
Electrode diameter
The parameter optimizes the AC TIG welding arc strike on the basis
of the diameter of the chosen electrode.
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