电弧超声的传播特征及其对熔合区的影响  

Propagating feature of arc ultrasonic and its effect on bond area

作　　者：何龙标[1,2] 李路明[3] 吴敏生[2] 

机构地区：[1]中国计量科学研究院,北京100013 [2]清华大学机械工程系,北京100084 [3]清华大学航天航空学院,北京100084

出　　处：《焊接学报》2010年第8期5-8,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50375080)

摘　　要：利用电弧作为超声声源的电弧超声焊接技术能够细化焊缝晶粒,改善焊缝质量,为了研究电弧超声的传播特征及其对熔合区的作用机制,建立了光弹试验系统,利用光学玻璃模拟焊接工件,凹形水槽模拟焊接熔池,研究了电弧超声在熔池及工件中的传播特征,结合电弧超声的声场指向性,研究了电弧超声对熔合区不同区域组织的影响.结果表明,电弧超声在熔合线附近存在较强的振荡,超声波的力学效应细化了熔合区的晶粒组织,电弧超声指向性的存在使得熔合区中间的晶粒细化程度优于焊趾两侧.The arc ultrasonic welding technology which uses welding arc as the ultrasonic source can refine the grain and improve the welding joint quality. To research the feature of arc ultrasonic propagating in molten pool and base metal, and its effect on the bond area, the photo-elastic system was set up. Welding piece and molten pool were simulated with optical glass and water channel respectively. With the directive property of arc ultrasonic field, the influence of arc ultrasonic on different zone of fusion area was studied. The results show that there are strong oscillating around the bond line and the mechanical effects of ultrasonic refine the structure of fusion area. The structure in the middle of bond zone is refined smaller than in the toe zone for the reason of the directive property of arc ultrasonic.

关 键 词：电弧超声 传播 细化 熔合区 

分 类 号：TG115.28[金属学及工艺—物理冶金]