Percussion weld monitoring

Details Percussion weld monitoring Percussion weld monitoring

1987-06-19

1988-03-01

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 95, 219109, 219118, 21913001, B23K 1114

Patent

active

047287683

ABSTRACT:
The quality of a percussion weld is sensed by measuring and analyzing certain features of the weld current signature. Instantaneous current is measured by a Hall sensor and permits isolation of the welder from the monitoring system. Weld quality is strongly correlated to the time to vaporize the nib separating the parts, and the dwell time to forge the parts together after nib explosion. A weld is assumed defective if nib time is too short or dwell time is too long. These quality parameters may be supplemented by weld and forge timing, line voltage, and acoustic information; a weld is rejected if any of these are outside of acceptance limits. Experiments on the percussion welding of silver-cadmium oxide to brass show that cadmium-oxide is decomposed and expelled by the forge pressure and the joint is a silver to brass weld.

REFERENCES:
patent: 3127595 (1964-03-01), Coyne
patent: 3239646 (1966-03-01), Goode et al.
patent: 3433921 (1969-03-01), Peterson
patent: 4609806 (1986-09-01), Grabkowski et al.
ASM Metals Handbook Eighth Edition, vol. 6, 1971, "Percussion Welding", pp. 177-186.
ASM Metals Handbook Ninth Edition, vol. 6, 1983, "Percussion Welding", pp. 739-745.

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