DOI: 10.5176/2251-1857_M316.11
Authors: Yang Hu, Guodong Cui, Wuqian Chai, Jinbao Zhang, Junying Chen and Chuan Yang
Abstract: Welding process heat input leads to greater welding residual stresses，large residual stress is likely to reduce the work piece fatigue life, promote crack propagation and stress corrosion cracking. Non-destructive testing surface and internal welding residual stress are very significant for service life. Critically refracted longitudinal (LCR) waves can propagate in various depths from the surface with using different frequencies, the linear relationship presents between the LCR wave velocity and the stress various in work piece. Amount former researches proved the practical of using the LCR wave to measure the longitudinal welding residual stress. When use the LCR wave to measure transverse residual stress, the receiving and excitation transducer may cross many zones such as melting zone (MZ), (heat affact zone) HAZ and (parent material) PM and the stress K are depended on different microstructures. When measure the different distance residual stress from the weld center, it is essential to correct the stress constant K to improve the accuracy of measuring transverse welding residual stress. The main purpose of this project is to revise the stress constant K to measure transverse welding residual stress
Keywords: Weld residual stress, Longitudinal critically refracted( LCR ) wave, Stress constant K, Microstructure effect, Revise transverse welding stress
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