Adaptive stepper

Details Adaptive stepper Adaptive stepper

1990-06-15

1992-01-21

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

050830031

ABSTRACT:
An adaptive stepper for adjusting welding heat boost to compensate for deterioration (flattening) of the electrode tips of a welder. Heat boost is provided to the welder as a function of expulsion rather than by a series of linear step profiles specified by a weld engineer. An operator sets up an adaptive schedule based upon an expected resistance difference between consecutive half-cycles considered to be "normal." If differences equal to or less than the normal level are detected during a group of welds, the heat boost will be incremented by 1% after a preprogrammed number of welds have been made. If differences greater than normal are detected, indicating expulsion, the boost will be decremented immediately by 1% between increases, if decrements are allowed at the time.

REFERENCES:
patent: 3591764 (1971-07-01), Taran
patent: 4419560 (1983-12-01), Zurek
patent: 4447700 (1984-05-01), Cohen
patent: 4456810 (1984-06-01), Schumacher et al.

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