Resistance welding sequence cycle control

Details Resistance welding sequence cycle control Resistance welding sequence cycle control

B - Operations, Transporting

23

K

327/107

B23K 11/24 (2006.01) B23K 11/25 (2006.01) G04G 15/00 (2006.01)

Patent

CA 1138536

RESISTANCE WELDING SEQUENCE CYCLE CONTROL ABSTRACT OF THE DISCLOSURE A method and apparatus are shown for controlling the cycle of a resistance welding device by providing compensation for variations in the effective weld area and the primary input electric power variations through a composite correction applied to the length of the squeeze time cycle portion prior to the weld cycle portion when weld current is activated. Compensation is made for secondary weld current variations by altering the length of the hold cycle, during which electrode contact is maintained with the work subsequent to the weld cycle portion, to change the amount of heat quenched from the weld zone. Further by sensing the condition wherein either the electrical input or the motive power that drives the movable electrode is beyond correctable limits, the welding cycle is aborted when suitable quality welds cannot be made. RO979-001

365210

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