Laser welding methods

Details Laser welding methods Laser welding methods

1992-11-18

1993-12-07

Albritton, C. L.

Electric heating

Metal heating

By arc

21912161, B23K 2600

Patent

active

052685560

ABSTRACT:
Welding a first body (11) of a first metal which has been plated on one surface thereof with a layer (13) of a second metal comprises the step of vaporizing a portion of said layer. This is done by directing a first pulsed laser beam (17) at the layer (13), the first pulsed laser beam having a first relatively high peak power and a first relatively low pulse duration. The vaporizing results in exposure of a portion of the first body (11). Thereafter, part of the first body is melted by directing a second pulsed laser beam (20) at the exposed portion of the first body, said second pulsed laser beam having a second peak power smaller than the first peak power and a second pulse duration longer than said first pulse duration. By using the same laser (18) in a two-step process, first to vaporize a portion of the plating, such as gold plating on Kovar, and thereafter using the same laser for making the weld, one can avoid a microcracking problem in a manner that is quick, simple and convenient.

REFERENCES:
patent: 4214904 (1980-07-01), Kitchen et al.
patent: 4355084 (1982-10-01), Kitchen
patent: 4506108 (1985-03-01), Kersch et al.
patent: 4859827 (1989-08-01), Coyle, Jr. et al.
patent: 5183992 (1993-02-01), Bilge et al.
patent: 5187346 (1993-02-01), Bilge et al.

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