Abstract
The residual stress field was calculated based on the numerical simulation of the temperature field of laser welding joint of stainless steel automobile vent pipe in order to improve the cold forming quality of ferrite stainless steel vent pipe and optimize its welding technology.The residual stress of stainless steel pipe was analyzed in laser welding considering the grid spacing transition and the mechanical property change of materials with temperature.Results showed that the average residual stress of welding seam was reduced but the undercut and incomplete penetration of welding seam easily appeared during the decreasing of roller pressure.Because the local stress concentration appeared,the cold forming of automobile vent pipe easily caused cracks.The axial residual stress distribution was narrow and the peak residual stress rose during decreasing heat input of laser welding.The residual stress in laser welding was compared with the residual stress in tungsten inert gas(TIG) welding+ laser welding.Results showed that the residual stress distribution in TIG + laser welding was wider than one in laser welding,the axial residual stress in TIG + laser welding was smaller than one in laser welding,and the cold forming quality of automobile vent pipe was improved.
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