Weld resistance measuring apparatus for a spot welder

Details Weld resistance measuring apparatus for a spot welder Weld resistance measuring apparatus for a spot welder

1985-04-01

1987-01-27

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

324 65R, B23K 1124

Patent

active

046395695

ABSTRACT:
Apparatus provides for measuring weld resistance of each of a group of weld sites that are subject to variation with respect to weld resistance. The apparatus includes circuitry for inducing a flow of alternating current in a weld site. The magnitude of the induced alternating current is substantially constant; in particular, the percentage variation in its magnitude is substantially less than the percentage variation in resistance to which the weld sites are subject. The apparatus further includes voltage responsive circuitry for producing a signal representative of the magnitude of the resistance of the weld site.

REFERENCES:
patent: 3621193 (1971-11-01), Low
patent: 4503311 (1985-03-01), Houchens et al.
C. A. Keskimaki, "Dynamic Resistance Spot Weld Analyzer", Western Electric Technical Digest, No. 46, 4/1977, pp. 21-22.

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