Electric heating – Metal heating – For bonding with pressure
Patent
1975-06-03
1977-01-25
Grimley, Arthur T.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
040053075
ABSTRACT:
A resistance spot welding method and apparatus wherein a weld can be judged to have an acceptable strength whether a splash (expulsion of weld metal) has occurred or not, provided that a maximum displacement (M) of a movable electrode to a fixed one is larger than a certain predetermined reference value (M.sub.L) or a rate (R) of the displacement at an initial stage is larger than a certain predetermined reference value (R.sub.L) which is defined between two certain predetermined reference values (R.sub.1, R.sub.E), by sensing the displacement and the rate thereof. Furthermore, when necessary, a weld is judged to have an acceptable indentation (I), as well, by sensing a position of the electrode at a specific point of time when a predetermined holding time has elasped from the time of de-energization of the welding current. Thus reliability of a spot welded joint is much improved and costly rejection of a welded product is considerably reduced.
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D. N. Waller et al., "Electrode Separation Applied to Quality Control in Resistance Welding", Welding Research Supplement, pp. 168-174, Apr. 1965.
K. I. Johnson et al., "New Design of Resistance Spot Welding Machine for Quality Control", Welding Research Supplement, pp. 122-131, Mar. 1972.
Kuroiwa Satoshi
Suzuki Mikiji
Tamura Yukio
Tanaka Yoshikazu
Grimley Arthur T.
Shaw Clifford C.
Toyota Jidosha Kogyo Kabushiki Kaisha
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