热丝氩弧焊在核级阀门密封面上堆焊新工艺及其应用  

Application of Hot-wire Argon Arc Welding Technology on Surface Overlaying of Nuclear Valve

作　　者：牛小欧 周晨光 冯文康 洪进元 NIU Xiaoou;ZHOU Chenguang;FENG Wenkang;HONG Jinyuan(Shanghai EHO Valve Co.,Ltd.,Shanghai 201823,China;China Nuclear Power Engineer Co.Ltd.,Ningde 355100,China)

机构地区：[1]上海一核阀门股份有限公司,上海201823 [2]中核霞浦核电有限公司,福建宁德355100

出　　处：《机械工程师》2023年第6期148-150,共3页Mechanical Engineer

摘　　要：核电站核岛内使用的小通径截止阀上的阀座密封面堆焊钴基硬质合金时,存在中腔空间小、堆焊位置距内壁距离短、焊枪干涉等问题,文中利用一把长度为1000 mm、外径为25 mm的热丝焊枪,对焊丝进行了有效预热,提高了熔敷速度,并可避免焊接裂纹、未熔合等缺陷的产生,大幅度提高了焊接生产效率及产品合格率。焊接试验和小批量试制表明,自动热丝氩弧焊阀门焊接专机可以有效地解决小规格截止阀深孔堆焊的工艺难题。The sealing surface of the valve seat on the small diameter valve used in the nuclear power plant needs to be overlaying with cobalt-based carbide,which has problems such as small aperture of the middle cavity,the short distance from the inner wall of the surfacing position,and welding torch interference.This paper uses a hot wire welding torch with a length of 1000 mm and an outer diameter of 25 mm to effectively preheat the welding wire,which improves the deposition speed,and can avoid defects such as welding cracks and non-fusion,and greatly improves the welding production efficiency and product qualification rate.The welding test and small batch trial production show that the automatic hot wire TIG welding valve welding machine can effectively solve the process problem of deep hole overlay welding of small-specification globe valve.

关 键 词：热丝氩弧焊(热丝TIG焊) 核级波纹管截止阀 深孔盲区堆焊 钴基硬质合金堆焊 

分 类 号：TG434.5[金属学及工艺—焊接]