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YAG-MIG复合焊接ZL-114A铝合金的接头组织与性能研究
Microstructure and properties of YAG-MIG hybrid welding joint of ZL-114A aluminum alloy
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摘要: 为了研究ZL-114A铝合金YAG激光-熔化极惰性气体保护(MIG)电弧复合焊接接头性能,采用拉伸试验和扫描电子显微镜对其力学性能和显微组织进行了测试分析。由于焊接固有的快速冷却特性及进口4047焊丝中细化晶粒元素(Ti)的存在,焊缝金属组织普遍较铸造组织细小,而且与采用的焊接线能量有关;靠近熔合线附近的晶粒粗化及固溶相的析出导致其硬度陡降,成为所谓的"软化区",是接头最脆弱部分,但其宽度及粗化程度较一般MIG电弧焊小,接头拉伸强度为母材的80%左右,断口呈脆性断裂特征。实验结果表明,采用适当的工艺参量,YAG-MIG复合焊接可以在较高的速率下得到高质量的焊接接头,是一种理想的铝合金高效焊接技术。
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关键词:
- 激光技术 /
- ZL-114A铝合金 /
- YAG-MIG复合焊接 /
- 显微组织 /
- 拉伸强度 /
- 软化区
Abstract: In order to study the performance of YAG-MIG(metallic inert gas)arc hybrid welding joint of ZL-114A aluminum alloy,the tensile test and scanning electronic microscope were adopted to analyze the mechanical properties and microstructure of welded joint.The microstructure of the bead was smaller than that of base metal because of the inherent splat cooling of welding and the beneficial effect of titanium(Ti),and the microstructure was smaller when the heat input was smaller.The crystal of heat affected zone(HAZ) was coursing,and had a softened zone near the bond line because of the precipitation and dissolution of the solid solution phase in base metal.The softened zone was the worst mechanics in the joint,which in the YAG-MIG hybrid welding was usually much narrower than that in the single MIG welding.The tensile-strength of the YAG-MIG hybrid welding joint was up to 80% of the base metal,In order to study the performance of YAG-MIG(metallic inert gas)arc hybrid welding joint of ZL-114A aluminum alloy,the tensile test and scanning electronic microscope were adopted to analyze the mechanical properties and microstructure of welded joint.The microstructure of the bead was smaller than that of base metal because of the inherent splat cooling of welding and the beneficial effect of titanium(Ti),and the microstructure was smaller when the heat input was smaller.The crystal of heat affected zone(HAZ) was coursing,and had a softened zone near the bond line because of the precipitation and dissolution of the solid solution phase in base metal.The softened zone was the worst mechanics in the joint,which in the YAG-MIG hybrid welding was usually much narrower than that in the single MIG welding.The tensile-strength of the YAG-MIG hybrid welding joint was up to 80% of the base metal,the fracture characteristic belonged to brittle fracture.The results show that the high quality joint can be achieved in a high welding speed when the welding parameter is appropriate,so the YAG-MIG hybrid welding is an ideal welding technique for aluminum alloy with high efficiency.the fracture characteristic belonged to brittle fracture.The results show that the high quality joint can be achieved in a high welding speed when the welding parameter is appropriate,so the YAG-MIG hybrid welding is an ideal welding technique for aluminum alloy with high efficiency. -
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