Study on Welding Process Between the Hexagonal Tube and the Grid Frame Component of MOX Fuel Assembly in CEFR

Yonglong Yu*, Liang Guo, Wande Zhang, Tongyu Zhu and Shunxiao Zhang
The 404 Company Limited, Lanzhou City, Gansu Province, China
*Corresponding Author: Yonglong Yu, The 404 Company Limited, Lanzhou City, Gansu Province, China.

Published: January 04, 2024

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Abstract  

A series of welding process tests were carried out for the pressure resistance spot welding (RSW) of the hexagonal tube and the grid frame component of MOX fuel assembly in CEFR. With the help of visual inspection, metallographic inspection and tensile test at room temperature, analyzing the influence trend of single welding parameter on the nugget diameter and mechanical properties. A set of optimal welding parameters is obtained by considering the influence of welding current, welding time and electrode pressure on the quality of welding joints. The results show that when the welding current is 3kA, the welding time is 8cyc (1cyc=1/50Hz), and electrode pressure is 350N, the diameter of the soldering core and the tensile force of the welding joints are relatively stable.

Keywords: CEFR; hexagonal tube; grid frame component; pressure resistance spot welding(RSW); welding process

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