机箱冷板结构失效分析及钎焊新工艺  

Failure analysis of aluminum alloy cooling plate in chassis and new brazing process

作　　者：程圣 周凤龙 Cheng Sheng;Zhou Fenglong(The 29th Research Institute of CETC,Chengdu 610031,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,成都610031

出　　处：《焊接》2019年第12期27-31,I0026,I0027,共7页Welding & Joining

摘　　要：文中主要对电子行业中机箱的冷板结构在钎焊后出现结合强度低的问题进行了失效分析,通过断裂试样的断口形貌的分析得出了焊接工艺是导致其结合强度低的原因,并针对此问题提出了采用分级钎焊的方法对钎焊工艺进行优化,采用Al-Si-Mg-Cu钎料作为第二次钎焊的钎料,并对采用钎焊新工艺的焊接接头的力学性能和微观组织进行了研究,发现采用新的焊接工艺的接头微观组织结合良好,其接头的抗剪强度从39 MPa提高到52 MPa。焊接接头主要断裂在钎缝中,钎料对母材润湿良好,解决了结合强度低的问题。Failure analysis was carried out on the problem of low bonding strength of the cooling structure in electronic field after being brazed.By analyzing the fracture morphology of fracture samples,it was concluded that the welding process is the cause of the low bonding strength.For this problem,the grade brazing process was proposed to optimize the brazing process,and Al-Si-Mg-Cu filler metal was put forward as the secondary step filler metal.Microstructure and mechanical properties of joints by new brazing process were investigated.It was found that microstructure of joints by new brazing process bonded well.Shear strength of welded joints increased from 39 MPa to 52 MPa.Fracture mainly occurred in the brazing seam and the brazing filler metal wet the base metal well,which solved the problem of low bonding strength.

关 键 词：6061铝合金钎焊 Al-Si-Mg-Cu钎料 失效分析 分级钎焊 

分 类 号：TG454[金属学及工艺—焊接]