LF2/LD7铝合金管板高频感应钎焊工艺研究  

High Frequency Induction Brazing Process of Tube-plate for LF2/LD7 Dissimilar Aluminum Alloy

作　　者：陈玉华[1] 邓怀波 黄永德[1] 刘浩[1] CHEN Yu-hua;DENG Huai-bo;HUANG Yong-de;LIU Hao(Department of Welding Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学焊接工程系,南昌330063

出　　处：《精密成形工程》2018年第5期59-63,共5页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51265042);江西省优势科技创新团队建设专项计划(20171BCB24007);江西省青年科学家培养计划(20153BCB23038);航空科学基金(2017ZE56010)

摘　　要：目的为高频感应钎焊在LF2/LD7铝合金管板焊接应用中提供理论基础。方法选取内径为8.6 mm、壁厚为1 mm的LF2铝合金管和厚度为5 mm的LD7铝合金板,采用高频感应钎焊焊接异种铝合金管板结构。焊接过程中对比添加或不添加碳棒辅助的情况,研究不同钎焊参数下的钎焊接头微观组织和显微硬度,分析碳棒辅助对高频感应钎焊的影响,利用EDS分析钎缝不同组织元素含量。结果最佳工艺参数为:距离D=7 mm,电流I=28 A,加热时间t=80~140 s。当电流增至I=35 A,其他焊接参数不变,添加碳棒辅助可以改变管板形貌,明显降低管烧损程度,组织低熔共晶体含量增多,晶粒细小。结论钎焊接头成形较好,钎缝区组织显微硬度高于母材区组织硬度,钎缝区元素出现偏聚现象。The paper aims to provide theoretical basis for application of high-frequency induction brazing in welding of LF2 LD7 tube-plate.LF2 aluminum alloy tube with inner diameter of 8.6 mm and thickness of 1 mm and LD7 aluminum alloy plate with thickness of 5 mm were selected to have high-frequency induction brazing on dissimilar aluminum alloy tube-plate.The effects of adding carbon-rods assistance on high-frequency induction brazing were studied.With different brazing parameters,the micro-structure and microhardness of brazing seams were analyzed.EDS analysis was performed in different areas of brazing seams.The best process parameters:distance D=7 mm,current I=28 A,heating time t=80~140 s.While current up to I=35 A,and other welding parameters constant,adding could change the morphology of tube-plate,significantly reduce the degree of tube burned,increase content of low-melting eutectic and refine the grain.The brazing seams are well formed.The microhardness of the brazing joints is higher than that of the base metal.Segregation of elements occurs to the brazing seams.

关 键 词：高频感应钎焊 LF2/LD7铝合金 碳棒辅助 微观组织 

分 类 号：TG454[金属学及工艺—焊接]