Study on TIG Girth Welding for the Long Bottom End Plug of Fuel Rods
The new fuel rod adopts the self-developed zircalloy cladding tube,which has a unique long and hollow bottom end plug structure.Due to the wall is thin,and the bottom end plug is long,the conventional TIG girth welding method of the fuel rod end plug will face problems such as easy burning of the weld,failure of the cor-rosion inspection,and the inability of welding equipment to meet the requirements.The welding tooling is de-signed.And the welding current test,tube negative pressure test and clamping distance adjustment test are car-ried out.In view of the small bevel area of the new end plug affecting the heat dissipation effect,welding de-formation resulting in excessive straightness,the structure of the welding tooling was redesigned.In order to a-void the excessive welding depth,the appropriate TIG welding peak current is selected,and the welding base current is re-matched.In order to ensure that the weld corrosion inspection results are qualified,the clamping distance of the cladding tube side is adjusted before welding,and the air inside the cladding tube is evacuated during welding.The new TIG girth welding process was used to obtain the weld quality with qualified appear-ance and dimensional,excellent physical and chemical properties,and the welding results met the requirements.
bottom end plugtig girth weldingwelding currentclamping distance
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