Resistance spot welder process monitor

Details Resistance spot welder process monitor Resistance spot welder process monitor

1984-01-16

1986-06-24

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

2191171, B23K 1124

Patent

active

045969175

ABSTRACT:
A multivariable process monitor and method of monitoring a resistance spot welding process to yield instantaneous information on weld quality during the weld cycle. Sensors on the machine measure welding input variables and workpiece response variables and provide signals to a microcomputer system. A simplified analytical model of the spot welding process is incorporated in the microcomputer and is the reference for the weld quality logic that accepts or rejects the weld. Faulty welds are diagnosed and the reason displayed.

REFERENCES:
patent: 3609285 (1971-09-01), Scarpelli
patent: 3708648 (1973-01-01), Croucher et al.
patent: 4329561 (1982-05-01), Schafer et al.
patent: 4447700 (1984-05-01), Cohen
Mollica, R. J., "Adaptive Controls Automate Resistance Welding", Welding Design & Fabrication, Aug. 1978, pp. 70-72.
Kuchar, N. R. et al., "A Closed-Loop Control System for Resistance Spot Welding", Measurement and Control for Batch Manufacturing, ed. by D. E. Hardt, ASME WAM, Nov. 14-19, 1982, pp. 89-103.
Nied, H. A., "The Finite Element Modeling of the Resistance Spot Welding Process", 64th AWS Annual Meeting, Apr. 25-29, 1983.

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