高频脉冲电流耦合交流CMT焊对2060铝合金接头组织与力学性能的影响  

Effects of AC CMT Welding Coupled with High-frequency Pulse Current on Microstructure and Mechanical Properties of 2060 Al-Li Alloy Joint

作　　者：汪殿龙[1] 陈彦朝 李海洋[1] 梁志敏[1] 

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050018

出　　处：《热加工工艺》2017年第21期13-16,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51205106);河北省自然科学基金项目(E2016208077)

摘　　要：采用不同频率的高频脉冲电流耦合交流CMT(cold metal transfer)焊,分别以ER4043及ER5356焊丝为填充材料,对2060铝锂合金进行焊接。结果表明,不同频率的高频脉冲电流对焊接接头的气孔数量及大小影响显著。耦合高频电流焊接后,焊缝中心的气孔数量减少,气孔大都集中在熔合线及焊缝边缘;与填充ER4043焊丝相比,填充ER5356焊丝的气孔数量少,尺寸也较小。不同的脉冲频率均能不同程度地细化显微组织,填充焊丝为ER4043,脉冲频率为40 k Hz时,组织细化现象显著,接头各区的硬度较高;填充焊丝为ER5356,脉冲频率为60、70 k Hz时,组织细化现象显著,接头各区的硬度较高。The CMT （cold metal transfer） welding coupled with different high-frequency pulse currents was used to weld the 2060 A1-Li alloy with ER4043 and ER5356 as filler materials respectively. The results show that the different high-frequency pulse currents have significant effect on the number and size of pores in welded joint. After welding with high frequency current, the number of pores in weld center reduces, and the pores are mostly concentrated on the fusion line and weld edge. Compared with ER4043 filler wire, the number of pores welded with ER5356 wire is small and the size is smaller. The microstructure can be refined with different pulse frequencies. When the filler wire is ER4043 and the pulse frequency is 40 kHz, the phenomenon of microstructure refinement is obvious, and the hardness of welded joint in different zones is high. When the filler wire is ER5356 and the pulse frequency is 60 or 70 kHz, the phenomenon of microstructure refinement is obvious, and the hardness of welded joint in different zones is higher.

关 键 词：CMT焊 气孔 高频脉冲电流 2060铝锂合金 组织细化 

分 类 号：TG444.7[金属学及工艺—焊接]