Electric heating – Metal heating – By arc
Reexamination Certificate
2006-02-14
2006-02-14
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S074000
Reexamination Certificate
active
06998574
ABSTRACT:
An electric arc welding torch having a central conductive contact tube for electrical contact between a power source and a welding wire moving through the contact tube toward a workpiece, a conductive sleeve concentric with the tube to define an annular chamber between the tube and the sleeve, a first dielectric barrier sleeve fixed on the conductive sleeve and a second dielectric sleeve on the tube where the dielectric sleeves are spaced from each other to define an annular gas passage extending around the moving wire and terminals to connect a high frequency power source between the tube and the conductive sleeve to create a dielectric barrier discharge plasma issuing from the gas passage. This torch is used in a novel welding method where the shielding gas envelope around the arc is a plasma.
REFERENCES:
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patent: 4234779 (1980-11-01), Willems
patent: 4767907 (1988-08-01), Otani et al.
patent: 5117088 (1992-05-01), Stava
patent: 6753497 (2004-06-01), Matus et al.
Cold Plasma Reactor with Dielectric Barrier DischargeP. Opalinska Industrial Chemistry Research Institute of Poland.
Dielectric-Barrier Discharges Principle and ApplicationsFrench Journal of Physics (1997).
Linclon Global, Inc.
Shaw Clifford C.
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