微织构特征对铝合金-CFRTP激光焊接头力学性能的影响  

Effect of microtexturing characteristics on the performance of laser welded aluminum alloy-CFRTP joints

作　　者：徐良 李康宁 杨海锋 宋坤林 谷世伟 XU Liang;LI Kangning;YANG Haifeng;SONG Kunlin;GU Shiwei(HWI-NICHST Welding and Engineering Innovation Center(Qingdao)Co.,LTD.,Qingdao,266000,China;National Invitation Center of High Speed Train at Qingdao,Qingdao,266108,China)

机构地区：[1]哈焊国创(青岛)焊接工程创新中心有限公司,青岛266111 [2]国家高速列车青岛技术创新中心,青岛266111

出　　处：《焊接学报》2024年第2期75-81,I0007,共8页Transactions of The China Welding Institution

基　　金：山东省重大科技创新工程计划资助(2021ZDPT02)。

摘　　要：该文研究了激光毛化微织构特征对铝合金-CFRTP激光焊接接头性能的影响,分析了激光毛化微织构的作用机理.结果表明,利用激光毛化技术可以在铝合金表面构建微织构,获得成形良好且性能优异的铝合金-CFRTP激光焊接搭接接头,接头处形成了有效的异种材料紧密嵌合.随着激光毛化微织构深宽比的增大,熔融CFRTP在铝合金表面微织构中由全部填充转变为部分填充,接头拉伸剪切性能呈现先增大后减小的趋势,接头失效机制呈现“混合断裂(粘附断裂+内聚断裂)-CFRTP母材断裂-混合断裂”的变化.当深宽比达到1.2~1.6时接头拉伸剪切性能值最大,此时断裂位置位于CFRTP母材.激光毛化微织构对铝合金-CFRTP接头强化机理为增强CFRTP在铝合金表面的机械嵌合作用,以及激光毛化微织构产生飞溅的“钉扎”作用.The effect of laser texturing on the performance of aluminium alloy-CFRTP laser welded joints was studied and the strengthening mechanism of laser texturing was analyzed.The results showed that the laser surfi-sculpt could be used to build texturing on the surface of aluminium alloys to obtain well-formed and high performance aluminium alloy-CFRTP laser welded lap joints,and the joint achieved tightly embedding.With the increasing of the depth-width ratio of the laser texturing,the molten CFRTP in the texturing was changed from fully filled to partially filled,and the joint shear properties showed a trend of first increasing and then decreased,and the joint failure mechanism was changed from hybrid fracture(adhesive failure+cohesive failure),CFRTP base material fracture to hybrid fracture.The joint performance reached its maximum when the depth-width ratio reached 1.2 to 1.6,at which point the fracture location was located in the CFRTP base material.The strengthening mechanisms of the aluminium alloy-CFRTP joint by laser texturing were enhancing mechanical embedding and the"nailing"effect of splashing.

关 键 词：激光毛化微织构 碳纤维 复合材料 激光焊接 

分 类 号：TG456.7[金属学及工艺—焊接]