单一及复合氧化物活性剂对镁合金A-TIG焊的影响
Effects of single and composite component oxides activating flux-es on A-TIG welding of magnesium alloy
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摘要: 以AZ31B变形镁合金为材料,采用五种单一氧化物MgO,Cr2O3,CaO,TiO2,MnO2进行混合配制得到复合配方。比较了无活性剂、涂敷单一TiO2活性剂和复合活性剂的焊缝熔深、接头金相组织、相组成及力学性能。结果表明,熔深达到最大的复合活性剂比常规TIG焊增加2.5倍左右,也比单一活性剂的熔深增加效果明显,同时其焊缝中晶粒比单一TiO2活性剂的晶粒细小,焊缝的抗拉强度比单一TiO2活性剂的高。经XRD分析复合配方中活性元素的加入改善了焊缝的相组成,避免了接头低熔点镁铝化合物脆性相的形成。Abstract: For AZ31B magnesium alloy materials, five kinds of single oxides MgO, Cr2O3, CaO, TiO2,MnO2 were used as the activating fluxes.The welding penetration, microstructures, phase composition and mechanical properties of welded joints without and with single oxide TiO2 and the composite oxide were compared.The results of experiments showed that welding penetration of compound fluxes is 2.5 times than conventional tungsten inert-gas welding, also deeper than that with single flux.The crystal grain of the composite fluxes is smaller than that of single TiO2 flux, and the tensile strength of the composite fluxes sample is superior to single TiO2 flux sample. The activating element was added into weld that improve the phase composition of compound fluxes, which avoid the formation of the low-melting point magnesium-aluminum phase in the welded joint.
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Keywords:
- magnesium alloy /
- activating fluxes /
- uniform design method
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