焊接热输入对TIG-CO_(2)复合焊组织和性能影响  

The Effect of Welding Heat Input on the Structure and Properties of TIG-CO_(2) Composite Welding

作　　者：谢玉伦 黄自成 王昆 汪奇 XIE Yulun;HUANG Zicheng;WANG Kun;WANG Qi(School of Mechanical Engineering,Anhui University of Information Engineering,Wuhu 241000,China)

机构地区：[1]安徽信息工程学院机械工程学院,安徽芜湖241000

出　　处：《徐州工程学院学报（自然科学版）》2024年第4期48-54,共7页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

基　　金：安徽省教育厅自然重点项目(2022AH051891);安徽省教育厅省级质量工程项目(2022xsxx092)。

摘　　要：采用TIG-CO_(2)复合焊接技术,在Q235钢表面制备Fe-Cr-C-B堆焊层,研究不同焊接热输入下复合焊接堆焊层组织和性能的变化.结果表明:不同焊接热输入下堆焊层焊缝与母材形成良好的冶金结合,界面处融合良好,没有发现明显的气孔、裂纹等焊接缺陷.堆焊层组织由树枝状马氏体和硬质合金相共同构成.随着热输入的增大,热影响粗晶区形成大量的过热魏氏体组织,堆焊层区域各部分组织晶粒有所增大.使用TIG-CO_(2)复合焊接技术在表面堆焊一层Fe-Cr-C-B堆焊层时,堆焊层硬度和耐磨性明显提高,当CO_(2)焊接电流为120 A时,堆焊层硬度最大为55HRC,磨损失重为0.051 5 g,堆焊层具有良好耐磨性.TIG-CO_(2)composite welding technology is used to prepare Fe-Cr-C-B overlay layer on the surface of Q235 steel,and the changes in the structure and properties of composite welded overlay layer are studied under different welding heat inputs.The findings indicate that the weld seam of the cladding layer exhibits a robust metallurgical bond with the base material across a range of welding heat inputs,demonstrating effective fusion at the interface and an absence of significant welding defects such as porosity and cracks.The cladding layer structure is composed of dendritic martensite and cemented carbide phases.As the heat input is increased,a significant number of superheated Weinstein structure are formed in the coarse crystalline region of the heat-affected zone.Additionally,the grain size of the various parts of the cladding layer region increases.The utilization of TIG-CO_(2)composite welding technology for the purpose of affixing a layer of Fe-Cr-C-B cladding to a surface resulted in a notable enhancement in the hardness and wear resistance of the cladding layer.The hardness of the cladding layer reached a maximum of 55 HRC when the CO_(2)welding current is 120 A.The wear loss is 0.0515 g,indicative of the layer’s commendable wear resistance.

关 键 词：复合焊 显微组织 硬度 耐磨性 

分 类 号：TG441[金属学及工艺—焊接]