Working of Resistance Weld Controller in Set - Weld - Inspect steps.

• Using a toroidal coil, the current wave form is reconstructed from the output signal.

• It is then transformed into an RMS effective value.

• The Weld controller then compares this effective value with the set current value.

• The weld current is corrected with every half cycle through phase conversion and trigger pulse oscillation.

• The result is smooth, consistent secondary welding current delivered at the weld regardless of the line voltage fluctuations.