上海交通大学学报(自然版) ›› 2018, Vol. 52 ›› Issue (12): 1649-1654.doi: 10.16183/j.cnki.jsjtu.2018.12.015

• 学报(中文) • 上一篇    下一篇

430铁素体不锈钢电阻点焊工艺性能

冯巧波1,2,李永兵1,楼铭1,来新民1   

  1. 1. 上海交通大学 上海市复杂薄板结构数字化制造重点实验室, 上海 200240; 2. 上海电力学院 创新创业工程训练中心, 上海 201300
  • 通讯作者: 李永兵,男,教授,博士生导师,E-mail:yongbinglee@sjtu.edu.cn.
  • 作者简介:冯巧波(1980-),男,浙江省丽水市人,博士生,工程师,主要研究方向为先进连接及先进制造技术等.
  • 基金资助:
    国家自然科学基金资助项目(U1564204,51805323)

Performance of Resistance Spot Welding Joints for AISI 430 Ferritic Stainless Steel

FENG Qiaobo,LI Yongbing,LOU Ming1,LAI Xinmin   

  1. 1. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Engineering Training Center, Shanghai University of Electric Power, Shanghai 201300, China

摘要: 采用机器人中频直流伺服焊枪点焊系统对1.2mm厚的AISI 430不锈钢薄板进行了点焊试验,研究了焊接电流对点焊接头力学性能、熔核直径、微观形貌、显微硬度以及拉剪断裂模式的影响规律.结果表明:随着焊接电流的增大,430不锈钢点焊接头抗剪强度增大,当电流达到10kA时,点焊出现飞溅现象,导致接头强度降低.接头熔核区由粗大的铁素体组成,带有少量的马氏体组织和碳化物沉淀.熔核区硬度高于母材区和热影响区,当熔核直径大于 4.8mm时,接头主要发生纽扣断裂;当熔核直径小于 4.8mm时,接头主要发生界面断裂,且一般为脆性断裂.

关键词: 电阻点焊, 工艺参数, 铁素体, 430不锈钢, 断裂模式

Abstract: The experiments of resistance spot welding for AISI 430 Ferritic stainless steel sheet with 1.2mm thickness was carried out by using the robot DC servo spot welding system. The effect of the welding current on the mechanical properties, the nugget diameter, the microstructure, the micro-hardness and the failure mode were researched. The results show that with the increase of welding current, the strength of the joint increases. When the current reaches 10kA, the splashing phenomenon occurs in spot welding, and it leads to the decrease of joint strength. The joint nugget region consists of coarse ferrite with a small amount of martensite and carbide precipitates. The hardness of the nugget area is higher than that of the base metal zone and heat affected zone. Joints mainly occur button fracture when the nugget diameter is more than 4.8mm. When the nugget diameter is less than 4.8mm, it is interfacial fracture, and usually is brittle fracture.

Key words: resistance spot welding, process parameters, ferrite, 430 stainless steel, failure mode

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