邦迪管Ni基钎料钎焊及焊缝组织分析  

Analysis of Ni-based brazing filler metals and weld microstructure of Bundy pipe

作　　者：曹丽丽[1] 祝邦文[1] 郑军[1] 管爱枝[1] 喻彩丽[1] 

机构地区：[1]浙江科技学院机械与汽车工程学院,杭州310023

出　　处：《浙江科技学院学报》2015年第6期504-507,共4页Journal of Zhejiang University of Science and Technology

基　　金：浙江省重大科技专项计划项目(2013C01080)

摘　　要：以镍(Ni)基钎料代替价格较高的银(Ag)基钎料对邦迪管-低碳钢管进行氮气保护下的炉中钎焊试验,并对焊缝成形性及其组织结构进行了分析。结果显示,采用Ni基钎料可实现邦迪管-低碳钢管的焊接,焊缝饱满致密,无气孔、夹杂。焊缝两侧靠近基材过渡区为粗大的固溶体组织,中心区为Ni固溶体和细小的Ni-P共晶颗粒。邦迪管镀层Cu熔点低,与液态钎料的Ni原子互扩散形成固溶体组织,即钎料向母材扩散和母材向钎料溶解;而低碳钢一侧以Ni的扩散为主。Bundy pipe-low carbon steel was welded with Ni-based brazing filler metals in furnace under nitrogen atmosphere,instead of expensive silver-based brazing filler metals.The weld formability and microstructure of the welded joint were analyzed.According to the results,a good pipe joint is achieved by Ni-based brazing filler metals,and the welded joint is full density,without pores and inclusions.For both sides of the welded joint,the transition zone closed to the base material is composed of bulky solid solution,while small Ni-P eutectic particles distributed in Ni solid solution in the center.The Cu coating of Bundy pipe has low melting point and Cu-Ni solid solution is formed due to the mutual diffusion of Cu and Ni atoms,namely the solder diffused to the parent metal and parent metal dissolved to brazing filler metals;and the diffusion of liquid Ni has priority from the welded joint to the base material.

关 键 词：Ni基钎料 炉中钎焊 邦迪管 组织结构 

分 类 号：TG425.2[金属学及工艺—焊接]