Abstract
Unbalance distribution of residual stress importantly result in deformation and breakage of pipeline welding (especially weak stiffness wall with complicated, huge and thin metal structure ), injecting high-energy guided acoustic wave into the interior of the pipeline wall to quickly homogenize and reduce residual stress distribution is the very effective way for controlling residual stress in balance state and breakage and deformation for plate-like structure at normal temperature. The physical principle of controlling and dispersing the residual stress concentration by high-energy guided acoustic wave with different frequencies, phases and amplitudes is to use the powerful kinetic energy generated by high-energy elastic waves to change the potential field energy formed by the residual stress throughout the whole weldings of pipeline, so that the residual stress can be reduced and homogenized; Realtime monitoring or detecting of the changes in residual stress using acoustic-elastic principle with the propagation of ultrasonic wave during residual stress being controlled, forming a closed-loop control system and technology for residual stress regulation; The directional acoustical beam can also provide the focusing energy for the stress concentration area inside the pipeline wall, and the local residual stress can be reduced and homogenized without changing the mechanical properties such as the elastic modulus and yield strength of the pipeline material, meanwhile, keep the pipeline shape unchangeable and unbreakable.
How to Cite:
Xu, C. ., Lu, Y. ., Li, Z. ., Li, D. . & Yin , P. ., (2019) “Ultrasonic nondetructive testing and insite control of welding residual stress of pipeline by high-energy guided wave”, Review of Progress in Quantitative Nondestructive Evaluation .
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