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Rashid Ali Sindhu,M.K.Park,Saemahn Bhak,Behzad Ahmed Zai,Hassan Mehboob,Joongwon Lee 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Residual stresses deteriorate strength of materials adversely affecting quality of industrial products. A removable or a reduction of the residual stresses is an essential procedure in successful product developments. Effective and convenient methods are necessary for detection and evaluation of the residual stresses. In this investigation Hole Drilling Method is chosen for identification and a quantitative determination of the residual stresses of specimen in two groups under different laser welding speed conditions, 4.1 m/min and 5.1 m/min. Laser lap welding of SPCC sheet joints was investigated along the welding line at two locations, at the welding middle and end locations in the heat affected zone (HAZ). Based on the experimental results and the analysis, higher welding speed condition is predicted to reduce the residual stresses.