Method for improving property of weld of austenitic stainless st

Details Method for improving property of weld of austenitic stainless st Method for improving property of weld of austenitic stainless st

1989-12-04

1991-06-11

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148127, 148136, 148903, C21D 908, C21D 810

Patent

active

050229362

ABSTRACT:
A method for improving a property of a weld of an austenitic stainless steel which is a part of a structure being brought into contact with a corrosive fluid at a region having been affected by welding heat on both of opposed surfaces, comprising the steps of: cooling said thermally affected region on one of said opposed surfaces; and simultaneously with said cooling step, applying a melting treatment to the other surface, thereby changing the melting treatment portion into a micro structure that contains delta (.delta.) ferrite and is superior in corrosion resistance property. The latter surface is improved in high tensile stress generated by the welding work. Namely, its stress is reduced. The melting heat for said melting treatment is obtained by application of high density energy.

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patent: 4807801 (1989-02-01), Nakamura

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