Electric heating – Metal heating – By arc
Patent
1994-02-09
1995-05-16
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913031, B23K 909
Patent
active
054162998
ABSTRACT:
A pulse welding apparatus using a pulse discharge such as a pulse arc welding apparatus and a short-circuit transfer arc welding apparatus. A pulse current waveform control circuit, which controls the pulse arc current so that a desired pulse arc current is supplied to the arc welding power supply for outputting the pulse arc current to the welding load unit, is constructed such that the optimum welding operation may be performed without having to adjust circuit components and modify circuit design. The pulse current waveform control circuit is in the form of a microcomputerized digital circuit which operates under a program to provide a desired pulse arc current. A modification of the program can provide any desired pulse arc currents without changing circuits. The optimum welding current waveform parameters or a target arc length signal is learned in the first welding stage and stored into a memory. An arc length feedback control or a current waveform control is performed under the control of program on the basis of the optimum welding current waveform parameters or the target arc length signal so as to control the faulty separation of globules when magnetic blow occurs and so as to reduce the variation of arc length due to external disturbances occurring at the welding torch so that improved welding quality is ensured under various environment.
REFERENCES:
patent: 4438317 (1984-03-01), Ueguri et al.
patent: 4758707 (1988-07-01), Ogilvie et al.
patent: 4994646 (1991-02-01), Tabata et al.
"Study of Metal Transfer in Pulsed GMA Welding", S. Ueguri et al., Welding Journal, Aug. 1985, pp. 242-250.
Katou Yoshiaki
Mizuno Masanori
Nagano Osamu
Tabata Yoichiro
Ueda Yoshihiro
Mitsubishi Denki & Kabushiki Kaisha
Shaw Clifford C.
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