摘要
为了解决搭接搅拌摩擦焊中出现的搅拌针磨损、焊接区域窄、钩型缺陷等问题,将搅拌摩擦钎焊(FSB)技术分别应用于含锡铅青铜(Cu-Sn-Pb)、H62黄铜及T2紫铜与45钢的连接,以研究上方铜合金塑性与成分对界面接合的影响。结果显示,以Sn作钎料的T2/45钢接头表面成形好,焊合率95%,仅在前进侧出现局部未焊合缺陷;以Zn作钎料的含锡铅青铜/45钢组合因该铜合金热裂而无法形成接头,原因是含锡铅青铜中偏聚的铅块会导致热裂纹,并使润湿性变差;以Zn作钎料,H62黄铜/45钢接头表面成形光滑,但因界面冶金反应不够充分,接头强度低。研究表明,FSB中上方工件的室温与高温塑形和成分分别对焊接接头表面成形和界面反应有显著影响;Cu-Sn-Pb过度溶解(溶穿出现裂纹)与H62黄铜溶解不足都影响结合强度,T2紫铜适度溶解与合金化有利于改善界面致密性与强度。
In order to solve the problems of lap friction stir welding,such pin wear,narrow welding area,and hook defects,the friction stir brazing(FSB)technology was applied to the connection of tin-containing lead bronze(Cu-Sn-Pb),H62 brass and T2 copper to 45 steel respectively,so as to study the influence of plasticity and composition of copper alloy on interface bonding.The results showed that the surface of the T2/45 steel joint with Sn as filler metal was well formed with a welding rate of 95%,local unwelded defects occurred only on the forward side;The tin-containing lead bronze/45 steel combination with Zn as filler metal cannot form a joint due to the hot crack of the copper alloy,the reason is that the lead block in Sn-containing lead bronze tends to lead to thermal cracking and poor wettability;with Zn as filler,the surface of H62 brass/45 steel joint is formed smooth,but the joint strength is low due to insufficient metallurgical reaction at the interface.The study indicated that the shaping and composition of the workpiece at room temperature and high temperature have significant influence on the surface forming and interface reaction of the welding joint respectively,the excessive dissolution of Cu-Sn-Pb(cracking occurs in the dissolution)and the insufficient dissolution of H62 brass both affect the bonding strength,and the moderate dissolution and alloying of T2 copper can improve the interfacial compactness and strength.
作者
鲍建东
张贵锋
唐英利
张建勋
BAO Jiandong;ZHANG Guifeng;TANG Yingli;ZHANG Jianxun(State Key Laboratory for Mechanical Behavior of Materials,Institute of Welding Research,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Light Industry Institute,Xi’an 710001,China)
出处
《焊管》
2020年第1期7-14,19,共9页
Welded Pipe and Tube
基金
陕西省技术创新引导专项资助项目（项目编号2017CGZH-XNGJ-01）
西安交通大学材料表面涂层改性创新团队专项资助项目（项目编号2018—2021）
