异质金属铁-镍点焊熔核形成规律的研究  

Study on formation rule of nugget during iron-nickel spot welding

作　　者：高旭[1] 燕峰[1] 陈永君 胡素影[1] 吴迪[1] 解志文 GAO Xu;YAN Feng;CHEN Yongjun;HU Suying;WU Di;XIE Zhiwen(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院

出　　处：《辽宁科技大学学报》2019年第4期309-313,320,共6页Journal of University of Science and Technology Liaoning

摘　　要：建立了异质金属铁-镍点焊熔核形成过程温度场数学模型,利用TFRSW软件进行数值分析,研究了异质材料点焊热过程中熔核的形成、发展及尺寸变化规律。熔核向低热传导率或高电阻系数工件偏移,随焊接时间增加偏移量逐渐减小;随焊接电流变大,熔核偏移量逐渐减小甚至消失。时间与电流对熔核形成过程的影响效果类似,在焊接时间规范影响下,熔化形核潜伏期和迅速增长期较短,减小期较长;在焊接电流规范影响下,熔化形核潜伏期较长,减小期较短。数值模拟过程考虑了边界冷却条件以及接触电阻、材料性能随温度变化的影响。实验验证了数值模拟结果的正确性。The mathematical model of temperature field during the formation of nugget in the resistance spot welding of dissimilar metal Fe-Ni was established.The formation,development,and size change of the nugget were studied by TFRSW software.The nugget migration to the workpiece with low thermal conductivity or high resistivity decreases with the increase of welding time.With the increase of welding current,the nugget offset decreases or even disappears.The effects of time and current on the nugget formation process are similar.Under the influence of welding time,the latent period of melting nucleation and the rapid growth period are shorter,while the decreasing period is longer.Under the influence of welding current,the latent period of melting nucleation is longer and the decreasing period is shorter.The effects of boundary cooling conditions,contact resistance,and material properties on temperature were considered in the numerical simulation.Experimental results show that the numerical simulation results are correct.

关 键 词：异质金属 点焊 有限差分 数值模拟 

分 类 号：TG453[金属学及工艺—焊接]