GIL壳体5754铝合金FSW与GTAW接头组织和性能
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摘要
针对GIL壳体材料5754铝合金,制备FSW和GTAW接头,并研究焊接接头的显微组织、拉伸性能、弯曲性能和冲击性能。结果表明,两种焊接方法下焊缝组织均为α-Al基体弥散分布着细小的β相(Al8Mg5),采用GTAW方法时,热影响区晶粒明显粗化;两种焊接接头的强度和弯曲性能均可以满足壳体的强度设计要求。由于FSW过程的搅拌作用,焊缝金属发生高温动态回复再结晶,因此FSW接头的抗拉强度和冲击性能更为优异。
For 5754 aluminum alloy employed in GIL,FSW and GTAW processes were adopted,and the microstructure,tensile properties,bending properties and impact properties of the welded joints were analyzed. The welded joints contained the matrix phase α-Al and the dispersed second β phase( Al8 Mg5) in two welded joints,and the grains in the heat affected zone are obviously coarsening in GTAW joint. The tensile and bending properties of both welded joints meet the GIL shell requirements of mechanical properties. Due to the dynamic recovery and recrystallization in FSW method,the FSW joints are higher in tensile and impact properties.
For 5754 aluminum alloy employed in GIL,FSW and GTAW processes were adopted,and the microstructure,tensile properties,bending properties and impact properties of the welded joints were analyzed. The welded joints contained the matrix phase α-Al and the dispersed second β phase( Al8 Mg5) in two welded joints,and the grains in the heat affected zone are obviously coarsening in GTAW joint. The tensile and bending properties of both welded joints meet the GIL shell requirements of mechanical properties. Due to the dynamic recovery and recrystallization in FSW method,the FSW joints are higher in tensile and impact properties.
引文
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[10]许壮,高剑,应俊杰,等. 5083铝合金搅拌摩擦焊工艺参数研究[J].焊接技术,2018,47(6):25-28.
[2]强伟,王克鸿,林祥礼.铝合金双面双弧同步立焊工艺特征与接头组织性能分析[J].机械工程学报,2015,51(24):82-89.
[3]赵忠刚,郭玉明,张凤英. GIS铝合金壳体的TIG焊焊接工艺及常见缺陷的成因概述[J].金属加工(热加工),2017(20):65-67.
[4]吴赛楠,贾志宏,Bita G,等. AA5754铝合金电阻点焊接头的微观组织和力学性能[J].中国有色金属学报,2018,28(4):645-653.
[5]宋洪杰.高强度铝合金及其先进焊接技术研究现状及发展方向[J].世界有色金属,2018,13:200-201.
[6]陈超,余朗,陈玉华,等.铝合金超声辅助搅拌摩擦焊接接头组织性能研究[J].精密成形工程,2018,10(5):33-37.
[7]戴启雷,张融,江晓明,等. AA6082铝合金搅拌摩擦焊接头疲劳扩展速率[J].焊接,2018(2):48-50.
[8]余爱武,宿国友,张春峰,等.铝合金螺旋管FSW焊与纵缝管熔焊组织及力学性能对比[J].电焊机,2018,48(8):48-52.
[9]冉继龙,高崇,刘贞山,等.工艺参数对5754铝合金搅拌摩擦焊搭接接头剪切性能的影响[J].焊接技术,2018,8(47):20-23.
[10]许壮,高剑,应俊杰,等. 5083铝合金搅拌摩擦焊工艺参数研究[J].焊接技术,2018,47(6):25-28.