Welded structure having improved mechanical strength and process

Details Welded structure having improved mechanical strength and process Welded structure having improved mechanical strength and process

1980-05-06

1982-09-07

Goldberg, Elliot A.

Joints and connections

Molded joint

Fusion bond, e.g., weld, etc.

219137WM, 403 28, 403 38, 403271, B23K 923

Patent

active

043481310

ABSTRACT:
A welded structure and a method for making same wherein a plurality of weld metals, such as martensitic steel and austenitic steel, differing in coefficient of thermal expansion from each other are deposited in a plurality of layers thicknesswise of the welded structure in a gap defined by structural members to be welded in such a manner that a layer of the weld metal of higher coefficient of thermal expansion is covered by a layer of the weld metal of lower coefficient of thermal expansion in a weld formed, to improve brittle fracture strength, fatigue strength and stress corrosion cracking resistance of the weld. By subjecting the welded structure to stress relief annealing treatment, it is possible to produce compressive stress on the surface of the layer of the weld metal of lower coefficient of thermal expansion.

REFERENCES:
patent: 1959791 (1934-05-01), Kautz
patent: 2819517 (1958-01-01), Pursoll
patent: 3351734 (1967-11-01), Arikawa
patent: 4013868 (1977-03-01), Koshiga

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