{"title":"Analysis of contact state and fracture mode of WC-10Co/B318 steel joint fabricated by resistance welding","authors":"Lingyu Chen , Chong Zhang , Guoyue Liu , Zhongning Guo","doi":"10.1016/j.ijrmhm.2025.107083","DOIUrl":null,"url":null,"abstract":"<div><div>The dissimilar joining of B318 steel and two shapes (spherical and cylindrical) of WC-10Co pellets was performed using resistance welding for application in bimetal band saw blades. The study investigates the effects of pellet shape on joint characteristics and contact state by analyzing the welding process, dynamic resistance, temperature field, macroscopic and microscopic joint morphology, and fracture mode. The results indicated that the shear force of joints with different shapes initially increases before decreasing as the welding current rises. The welding range for the spherical joint is narrower than that for the cylindrical joint, and no reaction layer is formed at the joint. In contrast, the cylindrical joint exhibits a shear force of 1175.3N at 750 A, representing the highest value among the two shapes across various welding currents. Under this parameter, the thickness of the formed reaction layer of the cylindrical joint is moderate, with no severe element loss, and fractures occur in the steel's heat-affected zone (HAZ). High-speed photography results showed that spherical joints generate heat faster than cylindrical joints. Numerical simulation results indicated that the peak temperature in spherical joints is higher than in cylindrical joints. These differences can be attributed to variations in pellet curvatures of different shapes, leading to different contact states of the workpieces during welding. This affected the heat generation process, the amount of joint deformation, and the elemental migration and metallurgical reactions at the joint interface. Comparing all aspects, the welding performance of the cylindrical joint proves superior to that of the spherical joint.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107083"},"PeriodicalIF":4.2000,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Refractory Metals & Hard Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263436825000484","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The dissimilar joining of B318 steel and two shapes (spherical and cylindrical) of WC-10Co pellets was performed using resistance welding for application in bimetal band saw blades. The study investigates the effects of pellet shape on joint characteristics and contact state by analyzing the welding process, dynamic resistance, temperature field, macroscopic and microscopic joint morphology, and fracture mode. The results indicated that the shear force of joints with different shapes initially increases before decreasing as the welding current rises. The welding range for the spherical joint is narrower than that for the cylindrical joint, and no reaction layer is formed at the joint. In contrast, the cylindrical joint exhibits a shear force of 1175.3N at 750 A, representing the highest value among the two shapes across various welding currents. Under this parameter, the thickness of the formed reaction layer of the cylindrical joint is moderate, with no severe element loss, and fractures occur in the steel's heat-affected zone (HAZ). High-speed photography results showed that spherical joints generate heat faster than cylindrical joints. Numerical simulation results indicated that the peak temperature in spherical joints is higher than in cylindrical joints. These differences can be attributed to variations in pellet curvatures of different shapes, leading to different contact states of the workpieces during welding. This affected the heat generation process, the amount of joint deformation, and the elemental migration and metallurgical reactions at the joint interface. Comparing all aspects, the welding performance of the cylindrical joint proves superior to that of the spherical joint.
期刊介绍：
The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.
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