Effect of laser incident angles on welding performance of galvanized sheet for vehicle body

In order to study effect of laser incident angles on welding performance of galvanized sheet,firstly orthogonal test was adopted to obtain ideal welding parameters at normal incidence through analyzing the weld topography,tension and shear load.Then galvanized sheet welding tests at different incident angles were carried out under the same ideal parameters at vertical incidence.The transverse weld topography,the connect width between plates and tension and shear load were analyzed when the incident angle changed.The research results show that fine weld topography and greater tension and shear load can be obtained at incident angle less than 30°;the connect width between plates has an significant influence on tension and shear load;slight change of the gap between plates will bring large effect on the critical incident angle.