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采用扫描电镜、显微硬度和抗拉强度等测试方法,研究了5052铝合金激光焊接接头组织和性能。研究结果表明,铝合金激光焊接接头热影响区主要为树枝晶,晶粒较为粗大;焊缝区主要为等轴晶,晶粒较母材和热影响区细小。铝合金激光焊接接头显微硬度焊缝区最高,热影响区最低。随着激光功率的增加,铝合金激光焊接接头抗拉强度先增加后降低,激光功率3.0 k W时达到最大值204.5 MPa,拉伸断口为典型的韧窝断口形貌。
The microstructure and properties of 5052 aluminum alloy laser welded joints were studied by scanning electron microscopy, microhardness and tensile strength test. The results show that the heat-affected zone of the aluminum alloy laser welded joints is mainly dendrites, the grains are coarse; the weld zone is mainly equiaxed grains, the grains are smaller than the base metal and the heat-affected zone. Aluminum alloy laser welded joints the highest hardness of the weld zone, the lowest heat-affected zone. With the increase of laser power, the tensile strength of the aluminum alloy laser welded joint first increases and then decreases, reaching 204.5 MPa at the laser power of 3.0 kW. The tensile fracture is a typical dimple fracture appearance.