Method and apparatus for improving fatigue strength in weld zone

Details Method and apparatus for improving fatigue strength in weld zone Method and apparatus for improving fatigue strength in weld zone

1975-03-20

1976-03-30

Mehr, Milton S.

Metal deforming

By application of fluent medium, or energy field

29421R, 228157, B21D 2604

Patent

active

039465837

ABSTRACT:
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.

REFERENCES:
patent: 2993263 (1961-07-01), Staples
patent: 3238610 (1966-03-01), Berg
patent: 3895436 (1975-07-01), Summers et al.

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