摘要
主要研究了端面粗糙度对锆合金包壳管脉冲TIG焊接接头组织和力学性能的影响。研究表明:端面粗糙度值的减小显著改善了焊缝表面质量,减少了水波纹缺陷,焊缝成形效果更佳。显微组织分析表明:焊缝区组织主要由α+α'+β相组成,热影响区主要为α+β相组织。端面粗糙度值的减小有助于熔池内部液态金属的均匀流动,能够抑制局部晶粒异常长大,提高了焊接接头组织的均匀一致性。力学性能试验结果表明:端面粗糙度值的减小可优化焊接热过程,进一步提高了焊接接头的抗拉强度和断后伸长率,且焊缝区硬度更为均匀。本研究阐明了端面粗糙度对焊接接头质量的影响,为锆合金包壳管的高质量焊接提供了科学依据和实践指导。
This paper focuses on the effect of end face roughness on the organization and mechanical properties of pulsed TIG welded joints of zirconium alloy clad tubes.It has been shown that the reduction in end face roughness value significantly improves the weld surface quality and reduces water ripple defects,resulting in better weld shaping.Microstructure analysis shows that the weld zone organization is mainly composed ofα+α'+βphases,and the heat affected zone is mainlyα+βphase organization.The reduction of end face roughness value helps to the uniform flow of liquid metal inside the molten pool,and can suppresses the abnormal growth of local grains.It improves the uniform consistency of the welded joint organization.The mechanical properties test results show that the reduction of end face roughness value can optimize the welding thermal process,further improve the tensile strength and elongation after break of the welded joint,and the hardness of the weld zone is more uniform.This study elucidates the influence of end face roughness on the quality of welded joints,and provides a scientific basis and practical guidance for the high-quality welding of zirconium alloy cladding tubes.
作者
韩晓瑞
米文俊
王云波
于宏生
刘博
张雪伟
潘胜强
HAN Xiaorui;MI Wenjun;WANG Yunbo;YU Hongsheng;LIU Bo;ZHANG Xuewei;PAN Shengqiang(China North Nuclear Fuel Element Co.,Ltd.,Baotou 014035,Inner Mongolia,China;China Nuclear Baotou Nuclear Fuel Elements Co.,Ltd.,Baotou 014035,Inner Mongolia,China)
关键词
锆合金包壳管
脉冲TIG焊接
钨极间距
端面粗糙度
组织性能
zirconium alloy cladding tubes
pulsed TIG welding
tungsten spacing
end face roughness
organizational properties
