Control method of spot welding

Details Control method of spot welding Control method of spot welding

1985-09-20

1987-01-06

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219110, B23K 1124

Patent

active

046348298

ABSTRACT:
A spot welding control method is disclosed wherein the welding current and welding time are controlled, in response to changes in the shape of the point of the electrode tip. At each weld point, the lowest value of the varying resistance between the electrode tips is detected in an initial welding period, and each detected lowest value is successively held and stored. At each weld point, a running average of the lowest resistance values is computed, bases on the resistance date of a group of weld points composed of the weld point just completed through a number of preceding weld points, the number of which is preset. The weld conditions are changed from one set of predetermined parameters to another when the computed average reaches the then prevailing threshold limit, following which the threshold is reset. The thresholds are preset depending upon the degree of wear of the electrode tip, whereby welding is continued under newly-selected weld conditions corresponding to the present threshold.

REFERENCES:
patent: 3546421 (1970-12-01), Meyer et al.
patent: 4024371 (1977-05-01), Drake
patent: 4343980 (1982-08-01), Stanya et al.

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