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Material Sciences 2021
7005铝合金CMT、TIG和FSW焊接接头组织与性能对比研究
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Abstract:
分别对2 mm厚的7005铝合金进行冷金属过渡(Cold metal transition welding, CMT)焊、钨极惰性气体保护(Tungsten inert gas, TIG)焊与搅拌摩擦焊接(Friction stir welding, FSW)，对比分析了3种焊接工艺下接头的微观组织、力学性能和应力腐蚀性能。结果表明：3种工艺都能获得无缺陷的接头。CMT和TIG焊核区晶粒粗大，FSW焊核区为等轴细晶；常温拉伸试验中，FSW接头强度和塑性要优于CMT和TIG接头。CMT、TIG和FSW焊接样件ISSRT值分别为8.3%、9.2%和4.9%，表明7005铝合金FSW焊接接头的应力腐蚀敏感性更低。
2 mm thick 7005 aluminum alloy was subjected to cold metal transition welding (CMT), tungsten inert gas welding (TIG) and friction stir welding (FSW), respectively. The microstructure mechanical properties and stress corrosion properties of the CMT, TIG and FSW joints were investigated. The results showed that defect-free joints for CMT, TIG and FSW were acquired. For the CMT and TIG joint, the nugget zone (NZ) was characterized with coarsened grains, for the FSW nugget, the NZs was characterized with equaix fine grains. The strength and plasticity of FSW joint is better than that of CMT joint and TIG joint. The stress corrosion sensitivity index of CMT, TIG and FSW welded samples are 8.3%, 9.2% and 4.9%, respectively, indicating that the stress corrosion susceptibility of 7005 aluminum alloy FSW welded joints is lower.
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