Electric heating – Metal heating – By arc
Patent
1998-07-15
2000-03-14
Shaw, Clifford C.
Electric heating
Metal heating
By arc
B23K 910
Patent
active
060375663
ABSTRACT:
An arc welding apparatus having output terminals of a constant current characteristic and a constant voltage characteristic is simply provided at low cost with a reactor appropriate for both the characteristics. A current control circuit 2 controls a secondary output current of a welding transformer 1 by means of a current control device, while a first reactor 3 and a second reactor 4 are constructed so that magnetic flux formed by a first winding 3a and magnetic flux formed by a second winding 4a, which are wound around an annular iron core 7, overlap each other. The other terminal of the first reactor 3 is connected to a constant current characteristic output terminal 8, while the other terminal of the second reactor 4 is connected to a welding base metal use output terminal 10. A constant voltage characteristic output terminal 9 and one terminal of the first reactor 3 are connected to the positive side of the current control circuit 2, while one terminal of the second reactor 4 is connected to the negative side of the current control circuit 2.
REFERENCES:
patent: 2447955 (1948-08-01), MillHolland et al.
patent: 2464679 (1949-03-01), Fletcher et al.
patent: 4398080 (1983-08-01), Johansson et al.
Naruto Masafumi
Okubo Masayuki
Yasuhara Yoshimichi
Matsushita Electric - Industrial Co., Ltd.
Shaw Clifford C.
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