镀镍层对双相钢和不锈钢激光焊接质量的影响  

Effect of Nickel Coating on Laser Welding Quality of Duplex Steel and Stainless Steel

作　　者：郝德胜 张华[1] 张亚楠 Hao Desheng;Zhang Hua;Zhang Yanan(School of Mechanical Engineering,Nantong University,Nantong,Jiangsu 226019,China;Nantong Siri Machine Manufacturing Co.,Ltd.,Nantong,Jiangsu 226500,China)

机构地区：[1]南通大学机械工程学院,江苏南通226019 [2]南通思瑞机器制造有限公司,江苏南通226500

出　　处：《应用激光》2021年第3期489-495,共7页Applied Laser

基　　金：科技部科技型中小企业技术创新基金项目(13C26213201887);南通市应用基础研究项目(GY12015019)。

摘　　要：针对异种钢材料焊接因母材性能差异而导致焊接质量差的问题,增设电镀镍作为母材中间层,来改善焊接质量。以DP590双相钢和304不锈钢为母材,采用Nd:YAG激光对异种钢材料进行激光拼接焊对比试验,利用光学显微镜、扫描电镜和拉伸试验机等实验设备对焊缝的微观组织、硬度、力学性能和耐腐蚀性能进行对比研究。结果表明:与未镀镍的焊缝相比,增设镀镍层提高了焊缝中Ni元素的含量,有利于焊缝处板条马氏体的形成;焊缝的平均硬度提高了12%,抗拉伸强度高于370 MPa;增设镀镍层,可减缓焊缝的腐蚀速率,提高焊缝的耐腐蚀性能。In order to improve the welding quality of dissimilar steel materials, nickel coating was added as the middle layer of the base metal. Using DP590 dual phase steel and 304 stainless steel as base materials, Nd: YAG laser was used to carry out laser splicing welding of the dissimilar steel materials. The microstructure, hardness, mechanical properties and corrosion resistance of the weld were studied by means of optical microscope, scanning electron microscope and tensile testing machine. The results show that the addition of nickel coating improves the content of Ni element in the weld compared with the no nickel coating dissimilar weld, which is beneficial to the formation of lath martensite in the weld. The average hardness of the weld area is increased by 12%, and the tensile strength is higher than 370 MPa. The corrosion rate of the weld can be slowed down and the corrosion resistance of the weld can be improved by increasing the nickel coating.

关 键 词：激光焊接 异种材料 镀镍层 显微组织 

分 类 号：TG456.7[金属学及工艺—焊接]