Electric heating – Metal heating – For bonding with pressure
Patent
1997-09-10
2000-01-04
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 869, 219 912, B23K 1120
Patent
active
060112352
ABSTRACT:
An apparatus for controlling resistance welding defines a weld time for series welding as a plurality of (e.g., two) weld periods. In one embodiment, a control successively switches a bidirectional switch in a first polarity during the first weld period so that welding current flows through workpieces of different metals in one direction by passing through a series of welding points of the workpieces. In the second weld period, the control successively switches the bidirectional switch in the reversed polarity so that welding current flows through the workpieces in the other direction so as to compensate for Pertier effect on the welding points. A polarity changing technique is used to minimize welding energy loss in shifting weld periods for better weld quality. In another embodiment, thyristors are controlled such that they are fired in the second half cycle of the supply voltage at an angle smaller than the firing angle in the first half cycle.
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Fujisawa Masaaki
Mukai Ren
Miyachi Technos Corporation
Shaw Clifford C.
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