Acoustic wave spot welder adaptive control

Details Acoustic wave spot welder adaptive control Acoustic wave spot welder adaptive control

1983-05-09

1984-05-15

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

73598, 219109, 219110, B23K 1124

Patent

active

044490291

ABSTRACT:
The thickness of the molten weld nugget is continuously monitored during resistance spot welding, and when proper penetration is achieved the applied current is turned off. An ultrasonic transducer housed in the water cooled lower welding electrode transmits ultrasonic pulses into the workpiece and receives waves reflected at each solid/solid and liquid/solid interface. The position of the latter is tracked by pulse time discrimination of reflected signals; weld nugget penetration is computed using a ratio of times or a pulse time difference.

REFERENCES:
patent: 3384733 (1968-05-01), Burbank et al.
patent: 3726130 (1973-04-01), Hurlebaus
patent: 4007631 (1977-02-01), Saifi et al.
patent: 4099045 (1978-07-01), Okuda et al.
R. J. Mollica, "Adaptive Controls Automate Resistance Welding," Welding Design & Fabrication, Aug. 1978, pp. 70-72.
"Acoustic Sensors Monitor Machine Noise," Machine Design, May 22, 1980, p. 124.

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