5A02铝合金C O2激光焊接头组织和力学性能分析

对2mm厚的5A02铝合金进行C02激光焊接试验研究.分析激光焊缝成形和接头微观组织形态,测定了接头上表面和焊缝厚度方向上的维氏硬度,并对接头进行横向和纵向拉伸试验,用扫描电镜观察分析拉伸断口形貌.结果表明,激光功率和焊接速度合理匹配能够获得成形良好、无缺陷的焊缝,焊缝中部为等轴细晶,熔合线附近是柱状晶组织.焊缝各区域...

Microstructure and mechanical properties in laser beam welding of 5A02 Aluminium alloys

2 mm thick aluminium alloys 5A02 plates were welded using CO2 laser beam in this paper.The laser weld formation and microstructure morphology were studied,the hardness on top and in the weld thickness were measured,also transverse and longitudinal tensile test were made.Moreover,tensile fractographys were analysed with SEM.The test result shows that the cooperation of laser power and welding speed can lead to perfect welds.There are equiaxed grains in center welds.The hardness in the fusion zone is higher than that in the base metal.The longitudinal average yield strengths of the welds were about 178% those of the base metals.The longitudinal average tensile strengths of the welds were about 151% those of the base metals,the base metal with deep dimples displayed a ductile type of fracture,and the welds with shallow dimples displayed ductile and brittle type of fracture.