Process gas and method for laser welding

Details Process gas and method for laser welding Process gas and method for laser welding

2005-11-08

2005-11-08

Evans, Geoffrey S. (Department: 1725)

Electric heating

Metal heating

By arc

C252S372000

Reexamination Certificate

active

06963046

ABSTRACT:
A process gas for use in laser welding with a laser beam focused onto the work piece to be welded. The inventive process gas comprises helium, nitrogen, and at least one of carbon dioxide in an amount of up to 40% by volume, and oxygen in an amount of up to 30% by volume. The gas may comprise not more than 85% by volume of helium. Also disclosed are methods of laser welding using the inventive process gas. The invention is suitable for laser welding of low-alloy steels and coated, especially zinc-coated steels.

REFERENCES:
patent: 3939323 (1976-02-01), Meehan et al.
patent: 4000392 (1976-12-01), Banas et al.
patent: 5073897 (1991-12-01), Larue et al.
patent: 5539180 (1996-07-01), Mori et al.
patent: 5618452 (1997-04-01), Matubara et al.
patent: 58-93592 (1983-06-01), None

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