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在2mm厚1420铝锂合金双光点激光焊接试验的基础上,研究接头的组织与性能。对比分析单、双光点激光焊接头各区域的组织、显微硬度及室温拉伸力学性能,并观察断口形貌。结果表明:1420铝锂合金双光点激光焊接头组织与单光点激光焊接头组织分布类似,从熔合区至焊缝中心依次是等轴细晶、柱状晶和等轴树枝晶,但较单光点接头细化;双光点激光焊接头各区域硬度低于母材,但高于单光点激光焊接头;双光点激光焊接头焊态抗拉强度较母材下降,但略高于单激光焊接头,可达母材的86%。
The structure and properties of the joints were studied on the basis of 2mm thick 1420 Al-Li alloy double-spot laser welding test. The microstructure, microhardness and tensile mechanical properties at room temperature of the laser welded joints were compared and analyzed. The fracture appearance was also observed. The results show that the microstructure of the 1420 Al-Li alloy double-spot laser welded joint is similar to that of the single-spot laser welded joint. The microstructure of the 1420 Al-Li alloy is similar to that of single The spot joints are refined. The hardness of the dual-spot laser welding heads is lower than that of the base metal but higher than that of the single-spot laser welding joints. The welding spot tensile strength of the dual-spot laser welding joints is lower than that of the base metal, Single laser welding head, up to 86% of the base metal.