Electric heating – Metal heating – For bonding with pressure
Patent
1985-09-23
1986-09-02
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219109, B23K 922
Patent
active
046098062
ABSTRACT:
The quality of welds produced during a percussion welding process are determined in real time by sensing the vibrational impulse signals produced during the percussion welding process, filtering the impulse signal to select a frequency band containing frequency components associated with the vibrations imparted to the forge rod of the welding machine, measuring the mechanical damping characteristics of the selected spectral portion of the signal by determining the log-decrement of the envelope of the signal, and comparing the measured log-decrement value obtained with a preselected threshold value.
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patent: 3462577 (1969-08-01), Helms et al.
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patent: 4296304 (1981-10-01), Defourny
patent: 4390770 (1983-06-01), Kohler et al.
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patent: 4447699 (1984-05-01), Gold et al.
American Society for Metals, "Percussion Welding", Metals Handbook Ninth Edition, vol. 6, Welding, Brazing, and Soldering, pp. 739-745.
Grabkowski Stephen E.
Schulz, Jr. Max W.
Williamson Robert D.
Davis Jr. James C.
General Electric Company
Shaw Clifford C.
Webb II Paul R.
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