5052铝合金双光点激光焊接组织与性能

Microstructure and mechanical properties of twin spot laser welding of 5052 aluminum

双光点激光焊接能够明显改善铝合金在激光焊接时容易产生气孔、咬边等焊接缺陷的情况且焊接过程稳定,是近几年焊接工作者研究较多的新兴焊接方法。在对5052铝合金进行双光点激光焊接工艺研究基础上,着重对2.0 mm厚5052铝合金双光点激光焊接接头组织与性能进行了研究。观察了单、双光点激光焊接接头组织,并测试了焊接接头各区域的显微硬度及室温拉伸力学性能,观察了断口形貌。结果表明,双光点激光焊接接头组织得到细化,接头各区域硬度高于母材,但低于单激光焊接接头。焊接接头抗拉强度略高于单激光焊接接头及母材,断后伸长率相差不大。

The twin spot laser welding could significantly improve weld quality.For aluminum,surface quality was improved with fewer surface defects such as undercut,surface roughness,spatter,and underfill. The microstructure of twin spots laser welding joint of 5052 aluminum alloy with 2.0 mm thickness was observed.The mechanical properties,such as the microhardness and the tensile properties at room temperature were also tested,meanwhile the fractography was observed.It is shown that the structure of twin spot laser welding is finer and the microhardness is higher than the ones of the base metal,but lower than single laser welded joint.Meanwhile the tensile properties of twin spot laser welding is higher than that of single laser welded joint and the base metal.