陈超,林三宝,范成磊,杨春利,李庆庆.2219/5A06异种铝合金焊接裂纹萌生机理[J].稀有金属材料与工程,2019,48(3):775~781.[Chen Chao,Lin Sanbao,Fan Chenglei,Yang Chunli,Li Qingqing.The mechanism of crack initiation of dissimilar joints between 2219 aluminum alloy and 5A06 aluminum alloy[J].Rare Metal Materials and Engineering,2019,48(3):775~781.]
2219/5A06异种铝合金焊接裂纹萌生机理
投稿时间:2017-10-08  修订日期:2017-12-21
中文关键词:  铝合金  异种焊接  焊接裂纹
基金项目:
中文摘要:
      采用光学显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)(点、线)及显微硬度实验,对不同焊丝获得的2219/5A06异种接头的软化情况与裂纹萌生机理进行了分析。结果表明:2325焊缝的硬度约为100HV,5B06焊缝的硬度约为80HV,5A06侧HAZ晶粒长大不明显未发生软化现象,2219侧HAZ发生较明显的软化;通过EDS线扫描分析可知,2325-5A06、5B06-2219的熔合线附近发生了明显的Mg、Cu扩散行为, 2325-2219、5B06-5A06的熔合线附近元素扩散行为不明显;与5B06焊缝相比,2325焊缝裂纹倾向更大,因为5B06焊缝不存在明显的低熔点共晶相,而2325焊缝存在大量的低熔点共晶Al2CuMg和CuAl2,Al2CuMg共晶的存在是致使其产生裂纹的根本原因。
The mechanism of crack initiation of dissimilar joints between 2219 aluminum alloy and 5A06 aluminum alloy
英文关键词:aluminum alloy  dissimilar welding  welded crack
英文摘要:
      In this paper, the crack initiation mechanism of dissimilar aluminum alloy welded joints was studied. The base metals are 2219 aluminum alloy and 5A06 aluminum alloy, the filler wires are 2325 and 5B06. The microstructure was analyzed by the optical microscope (OM), scanning electron micrograph (SEM) and energy dispersive spectroscopy (EDS). Results showed that the weld hardness obtained by the 2325 is about 100 HV and that by 5B06 is about 80 HV. Compared with heat affected zone (HAZ) of the weld obtained by 2219 and 2325, the grain growth of HAZ of the weld obtained by 5A06 and 2325 is not so obvious that the joint softening phenomenon doesn’t exist. The diffusion and segregation of Mg element and Cu element can be obviously observed in the welded fusion zone (FZ) obtained by 2325 and 5A06, and that by 5B06 and 2219. Compared with the welded joint obtained by 5B06 filler wire, the great cracking tendency can be found in dissimilar welded joint obtained by 2325 filler wire, because there is no obvious low melting eutectics in welded joint by 5B06 filler wire. Many low melting eutectics (Al2CuMg and CuAl2) present in the welded joint by 2325 filler wire, and the Al2CuMg eutectics are fundamental cause for the crack initiation.
作者单位E-mail
陈超 哈尔滨工业大学 先进焊接与连接国家重点实验室 929368583@qq.com 
林三宝 哈尔滨工业大学 先进焊接与连接国家重点实验室  
范成磊 哈尔滨工业大学 先进焊接与连接国家重点实验室  
杨春利 哈尔滨工业大学 先进焊接与连接国家重点实验室  
李庆庆 天津航天长征火箭制造有限公司  
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