Analysis of cracks in stainless steel TIG (tungsten inert gas) welds

Technical Report · Mon Dec 01 00:00:00 EST 1986

OSTI ID:7228699

Nakagaki, M; Marschall, C; Brust, F

This report contains the results of a combined experimental and analytical study of ductile crack growth in tungsten inert gas (TIG) weldments of austenitic stainless steel specimens. The substantially greater yield strength of the weld metal relative to the base metal causes more plastic deformation in the base metal adjacent to the weld than in the weld metal. Accordingly, the analytical studies focused on the stress-strain interaction between the crack tip and the weld/base-metal interface. Experimental work involved tests using compact (tension) specimens of three different sizes and pipe bend experiments. The compact specimens were machined from a TIG weldment in Type 304 stainless steel plate. The pipe specimens were also TIG welded using the same welding procedures. Elastic-plastic finite element methods were used to model the experiments. In addition to the J-integral, different crack-tip integral parameters such as ..delta..T/sub p/* and J were evaluated. Also, engineering J-estimation methods were employed to predict the load-carrying capacity of the welded pipe with a circumferential through-wall crack under bending.

• Research Organization: Battelle Columbus Labs., OH (USA)
• OSTI ID: 7228699
• Report Number(s): NUREG/CR-4806; BMI-2144; ON: TI87900393
• Country of Publication: United States
• Language: English

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