Ultrasonic testing method and apparatus for resistance welding

Details Ultrasonic testing method and apparatus for resistance welding Ultrasonic testing method and apparatus for resistance welding

1976-11-29

1978-07-04

Truhe, J. V.

Electric heating

Metal heating

For bonding with pressure

73629, B23K 1100

Patent

active

040990451

ABSTRACT:
An ultrasonic vibrator disposed on one of two opposed electrodes having two metallic plates sandwiched between them for being welded intermittently delivers a pulse-shaped ultrasonic wave to a reflecting surface located in the other electrode and receives the wave reflected from the reflecting surface. The vibrator converts the received wave to an electrical signal that is applied to a minimum sensor and a peak sensor. The minimum sensor senses and holds the minimum peak magnitude of the signal which is then subtracted from the peak magnitude of a similar signal developed within the peak sensor at the time of termination of the welding current. The resulting difference between the two magnitudes determines the weld condition of the welded plates.

REFERENCES:
patent: 2433963 (1948-01-01), Tarbox et al.
patent: 3384733 (1968-05-01), Burbank et al.
patent: 3410983 (1968-11-01), Deutsch et al.
patent: 3726130 (1973-04-01), Hurlebaus
patent: 3813926 (1974-06-01), Stubbeman

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