汽车板激光扫描焊接工艺研究

Laser scanner welding processing of automobile panels

为了研究激光扫描焊接汽车板的工艺方法,采用4k W光纤激光器对0.7mm镀锌板与0.8mm冷轧板SPCC两类汽车板的激光扫描焊接工艺进行了理论分析和实验验证,得到了板间间隙、激光功率、扫描速率等对焊缝成形及强度的影响规律。结果表明,当选取板间间隙0.1mm^0.2mm、激光功率3000W^3400W、焊接速率不小于3m/min等适当参量进行焊接时,焊缝质量可满足电子束及激光焊接接头欠缺质量分级指南C级标准,且强度高于母材。选取合适的工艺参量时,激光扫描焊接在无保护气的作用下可得到高质量的焊缝。

In order to research the process of laser scanner welding, the laser scanner welding process of 0. 7mm galvanized sheet and 0. 8mm cold-rolled sheet （ SPCC） with a 4kW fiber laser was analyzed in theory and verified in experiments. The influence of the gap between the sheets, laser power and scanning speed on macro-morphology and strength were obtained. The results show that the welded seams achieved by laser parameters of plate gap 0. 1mm～0. 2mm, laser power 3kW～4kW and welding speed 3m/min have the strength higher than the base metal, and can satisfy the C-class of electron and laser beam welded joints （ levels guidance for quality imperfaction ） . Laser scanner welding can get a high quality welding seam without shielding gas when selecting right parameters.