Electric heating – Metal heating – By arc
Reexamination Certificate
2006-01-03
2006-01-03
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S075000
Reexamination Certificate
active
06982397
ABSTRACT:
A TIG welding apparatus comprises; a twin electrode type welding torch1having a first and a second welding electrode1a, 1barranged approximately parallel and either side of an insulation plate of a predetermined thickness, and a main unit2which supplies to the first welding electrode1aa first welding current varied at a first period F, and to the second welding electrode1ba second welding current varied at the first period F and at an opposite phase to the variation of the first welding current. The main unit2superimposes a variation of a second period fm being shorter than the first period F, onto the first and second welding currents. As a result, the arc current is increased without increasing the welding current.
REFERENCES:
patent: 3781511 (1973-12-01), Rygiol
patent: 4396823 (1983-08-01), Nihei et al.
patent: 4436982 (1984-03-01), Kokura et al.
patent: 62-045474 (1987-02-01), None
patent: 2000-079477 (2000-03-01), None
Tejima Akio
Yamada Minoru
Ishikawajima-Harima Heavy Industries Co. Ltd.
Ostrolenk Faber Gerb & Soffen, LLP
Shaw Clifford C.
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