Investigation of spatter occurrence in remote laser spiral welding of zinc-coated steels
Investigation of spatter occurrence in remote laser spiral welding of zinc-coated steels
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DOI：
10.1016/j.ijheatmasstransfer.2019.06.009
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发表时间：
2019-09
影响因子：
5.2
通讯作者：
Shengjie Deng;Hui-Ping Wang;F. Lu;Joshua Solomon;B. Carlson
中科院分区：
文献类型：
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作者：
Shengjie Deng;Hui-Ping Wang;F. Lu;Joshua Solomon;B. Carlson
讨论了数值模拟在镀锌钢板远程激光螺旋点焊中的独特应用。建立了镀锌钢板远程激光螺旋点焊热-流体过程模拟模型，对激光与材料的相互作用、材料熔化、小孔形成和熔池动力学过程进行了数值模拟。基于数值计算的焊接过程中的温度分布，估算了焊接界面间的瞬时锌蒸气压。结果发现，高蒸汽压点相关性以及在高速视频中观察到的飞溅事件采取的熔池在焊接过程中。使用估计的锌蒸气压力作为飞溅发生的指标，重新设计焊接程序，以限制高锌蒸气压力和快速压力增加，以防止飞溅。修改后的时间表经物理测试验证，大大减少了飞溅。
This paper discusses the unique application of numerical modeling of remote laser spiral spot welding of zinc-coated steels to reduce spatter occurrence. A thermo-fluid process simulation model was developed to simulate the laser-material interaction, material melting, keyhole formation and molten pool dynamics occurring in remote laser spiral spot welding of zinc-coated steels. Based upon numerically calculated thermal profiles during welding, the instantaneous zinc vapor pressure between faying surfaces was estimated. It was found that high vapor pressure points correlated well with spattering events observed in high-speed videos taken of the molten pool during welding. Using the estimated zinc vapor pressure as an indicator of spatter occurrence, the welding schedule was redesigned to limit high zinc vapor pressure and rapid pressure increase for spatter prevention. The revised schedule was verified by physical testing and resulted in greatly reduced spatter.