基于排气通道的车身镀锌板激光叠焊工艺

为了解决汽车工业中车身镀锌板激光层叠搭接焊的问题，提出一种在镀锌板层叠接合面辊压一定排气通道的工艺方法，使之在零间隙下可获得一个较好的焊接效果。实验中对比了有无排气通道下，零间隙层叠搭接的焊接质量，从焊缝表面形貌、飞溅产生、焊缝组织、接头显微硬度及接头力学性能等方面进行了分析。结果表明，辊压得到主排气通道深度为125.0μm、次排气通道深度为32.6μm的复合排气通道，在激光功率为2500W、扫描速率为25mm/s时, 可以获得外观成形及力学性能均满意的搭接接头。该研究对提高车身镀锌板激光叠焊工艺是有帮助的。

Laser welding process of body galvanized sheet based on exhaust passage

In order to solve the problem of laser laminated lap welding of galvanized sheet for automobile body,a process of rolling a certain exhaust passage on the laminated joint surface of galvanized sheet was put forward,so that a better welding effect could be obtained under zero clearance.The welding quality of zero-gap laminated joints with and without exhaust channels was compared and analyzed from the aspects of weld surface morphology,splash generation,weld microstructure,micro-hardness,and mechanical properties of joints.The results show that the composite exhaust channel with the main exhaust channel depth of 125.0μm and the secondary exhaust channel depth of 32.6μm can be obtained by rolling,and the lap joint with satisfactory appearance and mechanical properties can be obtained at laser power of 2500W and scanning speed of 25mm/s.The research is helpful to improve the laser overlay welding process of body galvanized sheet.