Precursor of RAFT: Contant Heat Control (CHC)
CHC technology was a stepping stone to WTC's RAFT technology.
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.
There are a number of variables that can affect the behavior of the weld. Some of these include current shunting through adjacent welds, worn electrodes, variations in welding force, coatings on metals, cooling conditions of electrodes, and more. When these variables enter into play to cause change in heat application, the CHC algorithm will increase or decrease welding current in order to yield constant total applied heat. The graph below shows this effect.
Total applied heat after the 10th cycle of weld is equal to that of the normal condition.
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