Welding apparatus and method for welding overlapping coated...

Details Welding apparatus and method for welding overlapping coated... Welding apparatus and method for welding overlapping coated...

2006-08-15

2006-08-15

Paschall, Mark (Department: 3742)

Electric heating

Metal heating

By arc

C219S121460, C219S13700R

Reexamination Certificate

active

07091442

ABSTRACT:
A welding apparatus spot welds an upper sheet and a lower sheet together. A substantially semi-circular hole or notch is formed at an edge of the upper sheet at the desired location of spot welding. When the semi-circular hole or notch is formed, the process does not wrinkle or deform the upper sheet. A clamping cup of the welding apparatus surrounds the semi-circular hole or notch and contacts the upper surface of the upper sheet. A plasma arc torch heats the sheets, allowing entrapped vapors in a coating on the lower sheet to vent freely to the atmosphere. Filler wire is added and melted to fill the semi-circular hole or notch and to secure the overlapping sheets together.

REFERENCES:
patent: 4159410 (1979-06-01), Cooper
patent: 4916284 (1990-04-01), Petrick
patent: 5451742 (1995-09-01), Nishio et al.
patent: 6255618 (2001-07-01), Shintani et al.

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