Study on the application of rolling and laser processing to modify the residual stress state of multi-pass welds
Multi-pass welding of relatively thick structures results into a non-uniform metallurgical structure and a variable distribution of residual field through the thickness and across the weld. In multi-pass welds a previously deposited pass undergoes elastic, plastic, creep and viscous deformation from the deposition of weld metal in successive passes. In ferritic steel this also leads to formation of non-uniform metallurgical phases and microstructural features through the thickness which depends on the variable thermal cycles that a particular weld bead experiences during the entire period of welding. The heat affected zone also undergoes a series of complex thermal cycles and forms different metallurgical phases with variable microstructural features. The non-uniform strain from differential thermal cycle results into formation of a variably distributed residual stress state through the thickness and across the weld. The present proposal is aimed to understand and evaluate the effect of cold working through post weld rolling and subsequent laser processing in generation recrystallised grain structiure with modification of residual stress state.
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GANGULY SUPRIYO; COULES Harry; PIRLING Thilo and SULE Jibrin. (2013). Study on the application of rolling and laser processing to modify the residual stress state of multi-pass welds. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-143
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