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Measurement of residual stress in the weld overlay piping components

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Abstract

In general industry, especially in the nuclear industry, welding overlay repair is an important repair method mainly used to rebuild piping systems suffering from intergranular stress-corrosion cracking (IGSCC).

The pipe surface is mechanically ground to obtain a smooth surface after the welding overlay repair. A better understanding of the effect of repair and grinding processes on the residual stresses at the surface of weld overlay is required. To obtain this understanding, it is necessary to measure directly the distribution of residual stresses on the specimen. It is expected that compressive residual stress should be induced at the inner wall surface of the pipe for prevention of IGSCC.

The performance evaluation of welding overlay repair relies on whether or not the level and characteristic of the residual stress can be measured accurately. In this study, the hole-drilling strain-gage method, using the incremental drilling technique, was adopted to estimate the residual stresses on the inner and outer walls of the weld overlay pipe. The experimental results indicate that the residual stress at the pipe inner surface is compressive while that of the outer surface is tensile. Also, it is found that the depth affected by grinding is about 1.016 mm.

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Authors and Affiliations

  1. Materials Research Laboratories, Industrial Technology Research Institute, Building 77, 195 Chung Hsin Road, Section 4, Chutung, Hsinchu, Taiwan, Republic of China

    H. -J. Yen (Research Scientist) & M. C. C. Lin (Research Scientist)

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  1. H. -J. Yen
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  2. M. C. C. Lin
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Yen, H.J., Lin, M.C.C. Measurement of residual stress in the weld overlay piping components. Experimental Mechanics 35, 89–96 (1995). https://doi.org/10.1007/BF02326465

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  • DOI: https://doi.org/10.1007/BF02326465

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