Electric heating – Metal heating – For bonding with pressure
Patent
1987-03-09
1987-12-08
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219109, B23K 1124
Patent
active
047119845
ABSTRACT:
Ultrasonic transducers spring biased into seating engagement in a pair of opposed spot welding tips transmit and receive ultrasonic waves and associated circuitry measures the time of flight between the transducers which is a function of tip separation, workpiece temperature and nugget size which are indicators of the progress of a weld. The rate of change of flight time is measured and the weld current is adjusted early in the weld cycle to maintain a preset rate of weld growth. The weld current is terminated later in the cycle if the transit time rate falls below another preset value. Otherwise the weld current and termination time follow a standard schedule.
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G. E. Burbank et al, "Ultrasonic In-Process Inspection of Resistance Spot Welds", 4/1966.
A. Stiebel et al, "Monitoring & Control of Spot Weld Operations", 1968.
Bilge Umit
Ross John J.
Scarpelli August F.
Schwartz Ronald E.
General Motors Corporation
Hill Warren D.
Shaw Clifford C.
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