电弧超声在MGH956合金TIG焊接中的作用  

Effects of arc-ultrasonic on TIG welding of MGH956 alloy

作　　者：雷玉成[1] 黄巍[1] 赵凯[1] 梁申勇[1] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013

出　　处：《材料科学与工艺》2013年第6期12-16,共5页Materials Science and Technology

基　　金：国家自然基金项目(51075191);江苏大学科技创新团队项目(JD00019);江苏省博士创新计划资助项目(CXZZ11-0556)

摘　　要：为了改善MGH956合金的熔化焊接头性能,在其焊接过程中引入了电弧超声技术,以自制高Ni固体焊丝为填充材料对MGH956合金进行焊接,并与常规TIG焊进行对比,研究了电弧超声对焊缝组织和性能的影响.结果表明:电弧超声使焊缝组织得到明显细化,气孔数量减少;纳米Y2O3颗粒的聚集现象得到一定控制,且分布更加均匀;颗粒与基体Fe润湿性得以改善,使得两者界面结合良好,接头抗拉强度得到提高,达到615 MPa,同时焊缝的塑性得到明显提高,且使焊接接头由脆性断裂转变为完全韧性断裂.To improve the fusion welding performance of MGH956 alloy, arc-ultrasonic technology was introduced into welding process, and the high Ni solid welding wire was used as filling material. Comparing the microstructures and mechanical properties of the joint with and without arc ultrasonic, the mechanism of arc-ultrasonic vibration was investigated. The result shows that arc-ultrasonic can significantly refine the joint mierostructure and reduce the number of pores. The agglomeration and coarsening of nano-scaled oxide particles has been controlled, and the distribution of the particles is more uniform. The tensile strength of welding joints reaches 615 MPa resulting from the improvement of wettability between particles and matrix Fe. The toughness of the joints is improved obviously and the fracture mode changes from brittle fracture to complete ductile fracture.

关 键 词：电弧超声 MGH956合金 TIG焊接 显微组织 拉伸性能 

分 类 号：TG456[金属学及工艺—焊接]