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    • 7. 发明授权
    • Method and apparatus for improving fatigue strength in weld zones
    • 改善焊接区疲劳强度的方法和装置
    • US3946583A
    • 1976-03-30
    • US560208
    • 1975-03-20
    • Saburo Usami
    • Saburo Usami
    • B23K31/00C21D7/12C21D9/50B21D26/04
    • C21D7/12C21D9/50Y10T29/49805
    • In a weld for two metals having adjacent surfaces with a welded zone having deposited weld metal and an unwelded zone with a stress concentration between the two zones that would normally drastically decrease the fatigue strength, the fatigue strength is greatly improved by applying a preliminary load on the welds zone by the application of a fluid pressure between the unwelded adjacent surfaces to directly stress the stress concentration transition area. Preferably, the stress intensity factor for the fluid pressure at the stress concentration zone will be higher than the combined tensile and flexural stress intensity factors so that there will be localized yielding at the stress concentration area without damaging the remainder of the weld. The metal and/or fluid is heated to avoid fracture and further to vaporize any liquid remaining once the fluid pressure is removed.
    • 在具有相邻表面的两个金属的焊接中,焊接区具有沉积的焊接金属和在两个区域之间的应力集中在通常会显着降低疲劳强度的未焊接区域,通过施加初步负载大大提高疲劳强度 通过在未焊接的相邻表面之间施加流体压力直接施加应力集中过渡区域的焊缝区域。 优选地,应力集中区处的流体压力的应力强度因子将高于组合的拉伸和弯曲应力强度因子,使得在应力集中区域处将存在局部屈服,而不损害焊缝的其余部分。 加热金属和/或流体以避免断裂,并进一步蒸发除去流体压力后剩余的任何液体。