端面粗糙度对锆合金包壳管脉冲TIG焊接接头组织及性能的影响

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Abstract：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 bettr weld shaping.Microstructure analysis shows that the weld zone organization is mainly composed of a+a′+β phases， and the heataffected zone ismainly α+β phase organization. The reduction of end face roughness value helps to the uniform flowof 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 ofend face roughness value canoptimize the welding thermal process，further improve the tensile strength and elongationafter 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.

Keywords： zirconium alloy cladding tubes; pulsed TIG welding; tungsten spacing; end face roughness; organizational properties

1序言

锆合金因其优异的耐腐蚀性能和低中子吸收截面，在核反应堆燃料包壳中得到了广泛应用[1。（剩余3089字）