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[en] A number of undercut defects appeared on the electron beam welding (EBW) girth welds of bottom end plugs during product qualification of the first lot of AFA 3G fuel rod in Yibin Nuclear Fuel Element Plant. The author presents the analysis of the undercutting causes and the numerous tests have been done. The results show that modifying welding parameters, i.e. speeding rotation rate of the tube and limiting EB current intensity properly, is a desirable way to avoid the undercut defect during welding of fuel rods
Journal
Nuclear Power Engineering; ISSN 0258-0926; 
; v. 23(5); p. 75-78, 96
; v. 23(5); p. 75-78, 96