CHC is a new approach to controlling resistance welding
Instead of programming current into the welding schedule, "Constant
Heat Control (CHC)" algorithm seeks to maintain total weld
heat under control. Heat is the product of resistance, weld time,
and the square of weld current. The control needs to discriminate
the heat produced during welding and that which is lost in the inefficiencies
of the secondary.
The welding control can monitor heat developed between the electrodes
and evaluate if sufficient heat has been applied to melt the metals
to develop an acceptable weld nugget. The control is equipped with
voltage sensing at the electrodes and current monitoring. The value
of these parameters plus the time of current draw will measure "Heat"
provided to the welding zone.
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