钛与低碳钢的电阻点焊  

Resistance spot welding of titanium and mild steel

作　　者：邱然锋[1,2] 李青哲 石红信 里中忍[3] 

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]有色金属共性技术河南省协同创新中心,洛阳471003 [3]日本熊本大学,日本熊本860-8555

出　　处：《焊接学报》2018年第4期45-48,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(U1204520);河南省高校创新人才支持资助计划(16HASTIT050);河南省国际科技合作计划资助项目(182102410066)

摘　　要：采用电阻点焊方法对纯钛与低碳钢Q235进行焊接试验,利用扫描电子显微镜观察分析了熔核区组织特性,探讨了焊接电流对熔核尺寸和抗剪载荷的影响.结果表明,受焦耳热的影响熔核直径随焊接电流的增加而增加,抗剪载荷则随焊接电流的增大而呈先升后降的变化趋势,焊接电流为8 k A时所得接头的抗剪载荷最大,约2.85 k N.在钢侧熔核区观察到了靠近钢侧厚度约为30~50μm的TiFe_2+α-Fe共晶组织层和粗大TiFe柱状晶;钛侧熔核区主要由靠近钛侧约12μm厚的TiFe+α-Ti共晶组织层和TiFe柱状晶构成,且观察到了宏观分层现象.Pure titanium and mild steel Q235 sheets were welded by resistance spot welding. The nugget microstructure was observed and analyzed by using scanning electron microscopy. The effects of welding current on nugget size and tensile shear load of the joint were investigated. With the increasing of welding current,the nugget diameter increased while the tensile shear load of joint increased and then decreased when welding current was over 8 k A. A tensile shear load of a maximum of2. 85 k N was obtained at a welding current of 8 k A. The nugget of steel side was mainly composed of a 30 ～ 50 μm thick Ti Fe2+α-Fe eutectic structure layer adjacent steel and coarser Ti Fe columnar crystals. An approximately 12 μm thick Ti Fe + α-Ti eutectic structure layer adjacent titanium and Ti Fe columnar crystals were observed in the nugget zone of titanium side where macro stratification was also observed.

关 键 词：钛 低碳钢 电阻点焊 

分 类 号：TG441.2[金属学及工艺—焊接]