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为了解决镀锌钢板在激光焊接过程中由锌蒸气引发的焊接缺陷问题,在小孔上方施加平吹辅助气流,以维持小孔持续稳定张开并形成稳定的锌蒸气逸出通道;研究了平吹气流量对镀锌钢板零间隙激光搭接焊缝成形质量及力学性能的影响,通过焊接过程的实时监测和数值模拟分析了平吹气流对锌蒸气有效逸出的作用机理。结果表明,对厚度为1mm的DP590镀锌钢板进行零间隙激光搭接焊时,平吹辅助气流能有效促进锌蒸气的逸出,从而获得表面质量和力学性能较好的搭接接头。
In order to solve the problem of welding defects caused by zinc vapor in galvanized steel during laser welding, a flat blowing auxiliary air flow was applied above the small holes to keep the small holes open and stable and form a stable zinc vapor escape channel. Flow rate on the forming quality and mechanical properties of zero gap laser lap welding of galvanized steel. The mechanism of effective blowing out of zinc vapor by flat air flow was analyzed by real time monitoring and numerical simulation of welding process. The results show that the flat blowing auxiliary air flow can effectively promote the escape of zinc vapor during zero-gap laser lap welding of the 1 mm-thick DP590 galvanized steel, resulting in a lap joint with better surface quality and mechanical properties.