Electric heating – Metal heating – By arc
Patent
1997-07-21
1999-08-17
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912145, 21912159, 21912155, B23K 1000
Patent
active
059389486
ABSTRACT:
Method of one side spot welding of a metallic auto body construction containing vaporizable coatings or ingredients, the construction having overlapping metal plys, comprising: impinging a plasma column on a selected spot of one side of the construction, the plasma column being generated by passing a plasma gas at a predetermined flow rate through an electrical arc created by a predetermined electrical current path; shielding the plasma column in an inert gas containing at least 5-35% by volume of oxygen, the shielded plasma column melting at least the metal on one ply at the spot while the oxygen increases the fluidity and wetablility of the melted metal and reduce its surface tension allowing any vaporization of the ingredients to quiescently escape through the molten metal; and ceasing plasma arc impingement for allowing the molten metal to solidify and complete the spot weld.
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patent: 3969603 (1976-07-01), Boughton et al.
patent: 4023006 (1977-05-01), West et al.
patent: 4162389 (1979-07-01), Shimdada et al.
patent: 5225654 (1993-07-01), Harwig et al.
patent: 5466905 (1995-11-01), Flowers et al.
patent: 5734144 (1998-03-01), Yamaguchi et al.
Chennat Jay C.
Oros Alvin Kenneth
Yamaguchi Yoshihiro
Ford Global Technologies Inc.
Malleck Joseph W.
Paschall Mark H.
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