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JWJ > Volume 21(5); 2003 > Article
Journal of KWJS 2003 September;21(5) :69-76.
Published online September 25, 2003.
Evaluation of Residual Stress on Welded Joint in API X65 Pipe Line through Nondestructive Instrumented Indentation Technique
Won-jae Ji, Yun-Hee Lee, Woo-sik Kim, CheolMan Kim, Dongil Kwon




Correspondence:   Published online September 25, 2003
ABSTRACT
Apparent mechanical properties in structural components can be different from the initially designed values due to the formation of the residual stress in metal forming and welding. Therefore, the evaluation of residual stress has great importance in the reliability diagnosis of structural components. A nondestructive instrumented indentation technique has been proposed to evaluate various strength concerning mechanical properties from the analysis of load-depth curve. In this study, quantitative residual stress estimation on API X65 welded joints for natural gas pipeline was performed by analyzing the variation of indentation loading curve by residual stress through a new proposed theoretical model. The residual stress from the indentation method was compared with that from the saw-cutting method.
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