摘要
以100μm厚的铌箔为中间层,改变中间层的层数对钛与Q235低碳钢进行电阻点焊,利用扫描电镜对接头熔核区域的微观组织进行观察,研究了焊接电流和焊接时间对接头熔核直径和抗剪力的影响。结果表明:随着铌中间层层数的增加,可采用的焊接参数范围逐渐增大。但随着铌中间层层数的增加,焊接接头的抗剪力呈先增加后降低的变化趋势,在铌中间层层数为3层时,焊接电流为14 kA时达到最大,为6.29 kN。当中间层未熔断时,熔核区域组织主要由α-Fe和Fe_(2)Nb相组成;当中间层熔断时,熔核区域组织主要由TiFe、TiFe_(2)和残余Nb中间层处的FeNb金属间化合物组成。
With 100μm thick niobium foil as the intermediate layer,the resistance spot welding between titanium and Q235 low carbon steel was carried out by changing the number of intermediate layers.Microstructure of nugget area of the joint was observed by scanning electron microscopy.The effects of welding current and welding time on the nugget diameter and shear resistance of the joint were studied.The results show that with the increase of Nb intermediate layer number,the range of welding parameters that can be used gradually increases.However,with the increase of Nb intermediate layer number,the shear resistance of the welded joints increases first and then decreases.When the number of Nb intermediate layer is 3 and the welding current is 14 kA,the maximum shear resistance of the welded joints is 6.29 kN.When the intermediate layer is not fused,the microstructure of the nugget area is mainly composed ofα-Fe and Fe_(2)Nb phases.When the intermediate layer is fused,the microstructure of the nugget area is mainly composed of TiFe,TiFe_(2) and FeNb intermetallic compounds at the residual Nb intermediate layer.
作者
张坤
王楠楠
王增强
闫炳辰
邱然锋
ZHANG Kun;WANG Nan-nan;WANG Zeng-qiang;YAN Bing-chen;QIU Ran-feng(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Henan Province,Luoyang 471023,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2023年第1期191-198,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51875177)
河南省科技攻关项目(222102220067)。
关键词
钛
铌
低碳钢
电阻点焊
titanium
niobium
low carbon steel
resistance spot welding
