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    • 3. 发明授权
    • Laser welding methods
    • 激光焊接方法
    • US5268556A
    • 1993-12-07
    • US977950
    • 1992-11-18
    • Richard J. Coyle, Jr.Kevin M. HoganPaul J. SakachPatrick P. Solan
    • Richard J. Coyle, Jr.Kevin M. HoganPaul J. SakachPatrick P. Solan
    • B23K26/00B23K26/20B23K26/32
    • B23K26/32B23K2201/34B23K2203/02B23K2203/04
    • 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.
    • 焊接已在其一个表面上镀有第二金属层(13)的第一金属的第一主体(11)包括使所述层的一部分蒸发的步骤。 这通过在层(13)处引导第一脉冲激光束(17),第一脉冲激光束具有第一相对高的峰值功率和第一相对低的脉冲持续时间来完成。 蒸发导致第一主体(11)的一部分的曝光。 此后,通过在第一体的暴露部分处引导第二脉冲激光束(20)来熔化第一体的一部分,所述第二脉冲激光束具有小于第一峰值功率的第二峰值功率和更长的第二脉冲持续时间 比第一脉冲持续时间长。 通过在两步法中使用相同的激光器(18),首先使电镀的一部分(如Kovar上的镀金)蒸发,然后使用相同的激光进行焊接,可以避免在 方式快捷,简单方便。