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作 者:檀财旺[1,2] 张泽水 李昊岳 林丹阳 陈波 宋晓国[1,2] TAN Caiwang;ZHANG Zeshui;LI Haoyue;LIN Danyang;CHEN Bo;SONG Xiaoguo(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;Shandong Provincial Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,China)
机构地区:[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学(威海)山东省特种焊接技术重点实验室,山东威海264209
出 处:《电焊机》2022年第6期78-86,共9页Electric Welding Machine
基 金:国家自然科学基金资助项目(51875129);轻合金加工科学与技术国防重点学科实验室开发基金(EG202180417)。
摘 要:针对铝/钛接头界面脆性化合物层导致接头性能变差的问题,采用纳秒激光器对钛合金表面进行点阵和直线处理,改变表面微观形貌,并开展6061铝合金和TC4钛合金激光熔钎焊。结果表明,随着点间距的减小,钎料铺展能力显著增强,激光表面毛化处理有效改善了焊缝表面成形,且直线处理的效果弱于点阵处理;毛化处理对于界面化合物的种类影响不大,均为脆性Ti-Al化合物,主要是改变了凹坑处化合物的生长方向和形态;点阵式处理使铝/钛激光焊接接头拉伸载荷提升5%~21%,毛化处理的凹坑很好地阻碍了裂纹的扩展,而直线式处理对铝/钛接头的性能影响不大。指出了下一步的工作重点是如何在毛化处理的前提下提高熔融钎料的润湿效果,在改善接头力学性能的同时保证异种金属的润湿。In order to solve the problem that the brittle compound layer at the interface of the Al/Ti joint leads to the deterioration of joint performance,a nanosecond laser was used to treat the titanium alloy surface with laser surface texturing to change the surface microstructure.Then,laser brazing of 6061 aluminum alloy and TC4 titanium alloy was carried out.The study showed that the laser surface texturing effectively improved the weld surface formation,with a significant increase in brazing spreading ability as the dot density increased,linear processing was weaker than dot matrix processing.The laser texturing had little effect on the types of interfacial compounds,which were brittle Ti Al compounds,and more importantly,it changed the direction of growth and morphology of the compound in the pits.The properties of Al/Ti laser welded joints were improved by 5%~21%after dot matrix processing.The pits of texturing treatment hindered the crack propagation,while the linear processing had little effect on the properties of Al/Ti joints.It is pointed out that the next work focus is how to improve the wetting effect of molten solder on the premise of roughening treatment,so as to improve the mechanical properties of joints and ensure the wetting of dissimilar metals at the same time.
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