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采用合理的激光焊接工艺参数对镀锌钢板进行焊接,研究了激光参数对焊接接头组织和性能的影响。结果表明:焊接接头的抗拉强度随着激光功率和焊接速度的增加均呈先增大后减小趋势;焊缝区铁素体组织随着焊接功率的增加长大现象明显,而焊缝区铁素体组织却随着焊接速度的增加而变得细密;焊接接头的焊缝区的硬度均匀,且高出母材很多;焊接接头断口表现出明显的延性断裂特征。
The reasonable parameters of laser welding were used to weld the galvanized steel. The influence of laser parameters on the microstructure and properties of the welded joint was studied. The results show that the tensile strength of welded joint increases first and then decreases with the increase of laser power and welding speed. The ferrite microstructure in weld zone grows obviously with the increase of welding power, while the weld zone However, the ferrite microstructure becomes fine with the increase of the welding speed. The weld zone of the weld joint has the same hardness and is much higher than the base metal. The fracture of the weld joint shows obvious ductile fracture characteristics.