为提高采用AA4043焊丝焊接的AA6082钨极氩弧焊接头的力学性能,研究了元素Ti和Sr对连铸连轧AA4043焊丝的影响.结果表明:元素Ti、Sr变质效果较好,可以改善AA4043焊丝的显微组织,并提高AA6082焊缝的力学性能.与单独添加元素Ti或Sr相比,复合添加两种元素可以同时高效地变质α(Al)枝晶和共晶Si相.此外,元素Ti、Sr可以改善AA6082焊缝的显微组织,当复合添加0.08%Ti和0.025%Sr时,AA6082焊缝的抗拉强度达到最大.结果表明,Ti和Sr的复合添加可以实现较好的变质效果.
To improve the mechanical properties of AA6082 weld welded by tungsten inert gas welding using AA4043 welding wire, the effect of addition of Ti and/or Sr on continuous cast and rolled AA4043 welding wire was investigated. Experimental results indicated that Ti and Sr are excellent modifiers, which improve the microstructure of the AA4043 welding wire and enhance the mechanical properties of the AA6082 weld. It was found that the combinative addition of Ti and Sr can effectively modify both theα(Al) dendrites and eutectic Si phases compared with individual addition of Ti or Sr. In addition, Ti and/or Sr also changed the microstructure of the AA6082 weld. The tensile strength of the AA6082 weld reached the maximum value when 0.08% Ti and 0.025% Sr were added simultaneously. These results indicate that the combinative addition of Ti and Sr can be an effective composite modifier.
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