预热温度对35CrMo调质钢超窄间隙MAG焊接头性能的影响  

Effect of preheating temperature on the performance of 35CrMo tempered and quenched steel welded joint by UNG-MAG

作　　者：郭嘉琳[1] 万文峰 张富巨[1,3] 张国栋 GUO Jialin;WAN Wenfeng;ZHANG Fuju;ZHANG Guodong(School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;Lincoln ElectricCompany, Shanghai 201907, China;Narrowgap Intelligent Equipment Co., Ltd., Wuhan 430223, China)

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]林肯电气管理(上海)有限公司,上海201907 [3]武汉纳瑞格智能设备有限公司,湖北武汉430223

出　　处：《电焊机》2017年第11期31-34,共4页Electric Welding Machine

基　　金：国家自然科学基金资助项目(51305308)

摘　　要：35CrMo钢是一种常用的中碳低合金钢,其碳当量较高,焊接接头具有较大的冷裂纹倾向和热影响区性能恶化的可能性。对比两种不同预热温度下较低热输入超窄间隙MAG焊接头的微观组织和硬度分布,发现小幅度提高预热温度能小幅提高焊缝区和热影响区的强度,接头各区未出现异常组织,且完全避免了不完全正火区的软化。35CrMo steel, a common medium-carbon low-alloy steel, has a larger tendency of cooling crack anda probability of performancedeterioration in HAZ because of high carbon equivalent. In this paper, we compared microstructures and distribution of hardnessbetween two welded joints which had been preheating from two different temperatures. It was found that a small increase of preheatingtemperature could increase the strength of weld zone and heat affected zone slightly, and no abnormal microstructure was found in alljoints, and the softening of incomplete normalizing zone was completely avoided.

关 键 词：超窄间隙焊接 MAG焊 35CrMo 预热温度 

分 类 号：TG407[金属学及工艺—焊接]