In this study, a series of butt welding tests with oscillating fiber laser beams were performed on zinc-coated thin sheets of 0.8 and 1.2 mm thicknesses. The optimized welding parameters were used to produce robust welds with no perforations or pores. The weld formation process, microstructure, and mechanical properties of welded joints with the butt surfaces processed via laser and shear cutting techniques were systematically investigated. Besides, the corrosion resistance of the laser oscillating welded joint was analyzed in detail. The welded joint with the butt surface processed by laser cutting shows less undercutting degree with a more favorable weld appearance. The two welded joints had similar microstructures containing different forms of ferrites. The heat-affected zone was almost identical to the base metal in microstructure but had larger grains. Widmanstatten ferrites’ content in the large-grained weld metal of welded joints with surface processed via laser cutting exceeded that of shear cutting-processed ones. The former had lower tensile strength than the latter, but their overall mechanical performance was better than base metal. After salt spray corrosion and electrochemical corrosion tests, the laser oscillating welded joint was only slightly corroded and exhibited no obvious deterioration in corrosion resistance.

在这项研究中，使用振荡光纤激光束在 0.8 和 1.2 毫米厚的镀锌薄板上进行了一系列对接焊接测试。优化的焊接参数用于生产没有穿孔或气孔的坚固焊缝。系统研究了激光和剪切切割技术对对接表面焊接接头的焊缝形成过程、显微组织和力学性能。此外，详细分析了激光振荡焊接接头的耐腐蚀性能。采用激光切割加工对接面的焊接接头咬边程度较小，焊缝外观更美观。两个焊接接头具有相似的微观结构，含有不同形式的铁素体。热影响区的显微组织几乎与母材相同，但晶粒较大。经激光切割表面处理的焊接接头的大晶粒焊缝金属中Widmanstatten铁素体含量超过剪切切割加工的焊接接头。前者抗拉强度低于后者，但其综合力学性能优于母材。经盐雾腐蚀和电化学腐蚀试验后，激光振荡焊接接头只有轻微腐蚀，耐腐蚀性能没有明显下降。但它们的整体机械性能优于贱金属。经盐雾腐蚀和电化学腐蚀试验后，激光振荡焊接接头只有轻微腐蚀，耐腐蚀性能没有明显下降。但它们的整体机械性能优于贱金属。经盐雾腐蚀和电化学腐蚀试验后，激光振荡焊接接头只有轻微腐蚀，耐腐蚀性能没有明显下降。