Cr涂层对锆合金包壳管脉冲TIG焊接工艺的影响  

Influence of Cr Coating on Pulsed TIG Welding Process of Zircaloy Cladding Tube

作　　者：丁怀博 陈兵兵 李思功 姚俊 DING Huaibo;CHEN Bingbing;LI Sigong;YAO Jun(CGNPC Uranium Resources Co.,Ltd.,Yangjiang 529500,China;CNPRI Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]中广核铀业发展有限公司,广东阳江529500 [2]中广核研究院有限公司,广东深圳518000

出　　处：《热加工工艺》2023年第23期55-57,共3页Hot Working Technology

摘　　要：对Cr涂层锆合金包壳管进行了脉冲TIG焊接,并对Cr涂层包壳管的焊缝成型及组织进行了分析。结果表明,Cr涂层包壳管的焊缝成型较好,但Cr蒸汽在钨极表面附着,且易与钨极中的W发生匀晶反应,加速了钨极烧损。Cr涂层引起接头表面的氧化色加重,在焊缝的涂层侧形成蓬松层,高温水腐蚀后蓬松层出现脱落。涂层Cr元素熔入焊缝后促进晶粒细化,也造成一定的焊缝夹杂。Cr coated zircaloy cladding tube was welded by pulsed TIG welding,the weld forming and the microstructure were studied.The results indicate that the weld forming of Cr coated cladding tube is good,but Cr vapor attachs to the tungsten electrode,and reacts with W,which speeds up the electrode erosion.Cr coating leads to serious oxidation in the joint,and a fluffy layer is formed at the coating side of the weld.After water corrosion test,obvious peeling occurs in the fluffy layer.Cr element in the coating fuses into the weld and promotes grain refinement,but also results in inclusions in the weld.

关 键 词：Cr涂层 锆合金 包壳管 TIG焊接 

分 类 号：TG444.74[金属学及工艺—焊接] TG457.6