混合气体保护脉冲TIG工艺在UHVDC阀冷管道预制的应用  

Application of mixed gas protection pulse TIG in UHVDC fluid pipeline welding

作　　者：黑增杰 万阳 叶正山 Hei Zengjie;WanYang;Ye Zhengshan(Henan Lvkong Technology Co.,Ltd.,Xuchang 461000,Henan,China;Henan Pinggao Electric Co.,Ltd.,Pingdingshan 467000,Henan,China;Air Liquide(Hangzhou)Co.,Ltd.,Hangzhou 324017,Zhejiang,China)

机构地区：[1]河南绿控科技有限公司,河南许昌461000 [2]河南平高电气股份有限公司,河南平顶山467000 [3]液化空气(杭州)有限公司,浙江杭州324017

出　　处：《机械制造文摘（焊接分册）》2020年第3期36-40,共5页Welding Digest of Machinery Manufacturing

摘　　要：在构建全球能源互联电网的过程中,UHVDC主要用于高电压、大容量、远距离的直流输工程。换流阀冷却设备是UHVDC中重要核心设备,使用电导率<0.1μS/cm的超纯水冷却介质,介质流体管道采用304L或316L奥氏体不锈钢材质,针对设备特殊工况要求和母材材质特点,经过深入调研及试验,优化并推广应用了一种零间隙混合气体保护脉冲TIG。该工艺采用零间隙组对装配,焊件装配效率同比提升150%,采用3%H 2+97%Ar低比例混合气体保护,在焊接热输入下降10%的条件下,焊接效率同比提升50%,采用低频异步脉冲控制焊缝成形,一次焊接质量合格率达到98.6%以上。该工艺极大的缩短了焊接准备时间,提高了焊接加工效率,经实际推广验证,取得了良好的经济效益和社会效益。In the process of building global energy interconnection power grid,UHVDC is mainly used for high-voltage,large-capacity,long-distance DC transmission projects.Converter valve cooling equipment is an important core of UHVDC equipment,use electrical conductivity<0.1μS/cm ultrapure water cooling medium,medium fluid pipeline in 304L or 316L austenitic stainless steel material,according to the characteristics of the special working condition of equipment requirements and the base material,after in-depth research and experiment,the optimization and application of a kind of mixed gas pulse TIG zero clearance.Zero-gap group assembly is adopted in this process,and the assembly efficiency of welding pieces is increased by 150%year on year,and 3%H 2+97%Ar low proportion mixed gas protection is adopted.Under the condition that the welding line energy decreases by 10%,the welding efficiency is increased by 50%year on year.Low frequency asynchronous pulse is used to control the welding seam forming,and the qualification rate of primary welding quality reaches above 98.6%.This process greatly reduces the welding preparation time and improves the welding processing efficiency,and has achieved good economic and social benefits through practical promotion and verification.

关 键 词：UHVDC特高压直流输电换流阀冷却设备 不锈钢流体管道 零间隙 混合气体保护脉冲TIG 

分 类 号：TG444[金属学及工艺—焊接]