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Method and apparatus for inhibiting stress corrosion cracking adjacent weldments in steel workpieces such as stainless steel pipe through generation of a controllable throughwall temperature differential by exposure of one workpiece surface to externally generated radiant heat while maintaining a fl

Method and apparatus for inhibiting stress corrosion cracking adjacent weldments in steel workpieces such as stainless steel pipe through generation of a controllable throughwall temperature differential by exposure of one workpiece surface to externally generated radiant heat while maintaining a flow of coolant fluid past the other surface thereof.

대표청구항 ▼

A method for the inhibition of intergranualar stress corrosion cracking adjacent to a welded joint in an austenitic stainless steel workpiece, comprising the steps of selectively subjecting a first surface of said welded joint and the workpiece areas adjacent thereto that are normally subject to loc

A method for the inhibition of intergranualar stress corrosion cracking adjacent to a welded joint in an austenitic stainless steel workpiece, comprising the steps of selectively subjecting a first surface of said welded joint and the workpiece areas adjacent thereto that are normally subject to localized residual compressive stress to radiant heat emanating from an external source of radiant heat disposed in closely spaced proximity thereto, maintaining a flow of cooling fluid past a second surface of said welded joint disposed in spaced relation with said first surface and the workpiece area adjacent to said second surface that are normally subject to localized residual tensile stress, regulating the quantum of applied radiant heat and the quantum of said cooling fluid to create a temperature differential across said first and second surfaces of said welded joint and the workpiece areas adjacent thereto of a magnitude sufficient to create a localized thermal stress in excess of the localized residual compressive yield stress on said first surface and areas adjacent thereto and in excess of the localized residual tensile yield stress on said second surface and areas adjacent thereto, and cooling said first and second surfaces of said welded joint and areas adjacent thereto to ambient temperature to markedly reduce the magnitude of the residual compressive stress on said first surface and workpiece areas adjacent thereto and to markedly reduce the magnitude of the residual tensile stress on said second surface and workpiece areas adjacent thereto.