白车身钢制门窗框远程激光焊工艺研究OA

This study aims to investigate the influence mechanism of remote laser welding process parameters on the weld-ing quality of steel door and window frames for Body-in-White(BIW).Using galvanized low-carbon steel test coupons with identical material and thickness to the actual product,the lap joint configuration of the window frame welding flange was simulated to conduct remote laser fillet welding experiments.The research systematically analyzed the effects of key param-eters—including lap offset,fit-up gap,welding speed,and laser power—on weld formation and defect generation.The ex-perimental results indicate that:to ensure seam tracking stability and welding quality,the lap offset should be no less than 4 mm;the fit-up gap must be strictly controlled within 0.5 mm,as excessive gaps lead to insufficient filler metal from the mol-ten pool,reduced effective weld width,and a tendency for burn-through defects;the welding speed should not exceed 70 mm/s,as higher speeds cause molten pool instability,increased spatter,and porosity;the optimal laser power range is 2 100-2 150 W,with higher power exacerbating zinc vapor ejection,increasing spatter,and interfering with seam tracking.By opti-mizing and controlling these process parameters,this study successfully suppressed common defects such as porosity,under-cut,and burn-through,producing well-formed and qualified remote laser welded joints.The findings provide direct technical guidance for achieving high-quality and efficient remote laser welding in the steel door and window frame areas of BIW.