Laser welding method of nuclear fuel storage framework bush square tube and small base plate

Abstract

The invention relates to a laser welding method of a nuclear fuel storage framework bush square tube and a small base plate. The method includes: machining a R1.5mm-R2mm arc groove 3-4mm in depth at a position 2mm from the periphery of the small base plate; mounting the arc groove to a clamp tool to allow the arc groove to be in butt joint with the nuclear fuel storage framework bush square tube, adjusting laser welding power to 2500W and a welding focus point T to 98.5-99mm, and welding under protection of helium with high purity; if partial out of tolerance of welding seam gap or welding seam straightness occurs, and adjusting the welding focus point T to 99.5-100mm for secondary welding so as to correct welding seam quality; using a tool for rotation so as to weld welding seams of other faces; wherein R refers to radius, butt joint gap between the arc groove and the nuclear fuel storage framework bush square tube is strictly controlled to be smaller than 0.1mm and welding seam straightness is controlled to be smaller than 0.5mm, when the welding focus point T is adjusted to 99.5-100mm, welding seam width is increased slightly, and all original welding seams can be remelted, and during welding of welding seams of other faces, symmetric welding is adopted to reduce welding stress and deformation.

Description

technical field [0001] The invention relates to a laser welding method for a nuclear fuel storage grid storage sleeve square tube and a small bottom plate. The nuclear fuel storage grid storage sleeve is widely used in nuclear power plants and nuclear chemical industry systems to store fuel components, and is closely related to nuclear safety. Equipment, equipment life cycle can not be less than 40 years. It is required to strictly control the welding deformation of the nuclear fuel storage grid storage casing square tube during welding and manufacturing, and the inner surface of the nuclear fuel storage grid storage casing square tube must not have any protrusions higher than 0.1mm. Background technique [0002] At present, the storage casing square tube or hexagonal tube and the small bottom plate adopt the process method of wire-filled argon arc welding, because the thickness of the square tube or hexagonal tube (2-4mm) and the small bottom plate (8-20mm) is quite differ...

AI Technical Summary

Problems solved by technology

[0002] At present, the storage casing square tube or hexagonal tube and the small bottom plate adopt the process method of wire-filled argon arc welding, because the thickness of the square tube or hexagonal tube (2-4mm) and the small bottom plate (8-20mm) is quite different, and the commonly used The method of thinning the thick plate is not suitable for this product, so it is easy to deform after welding, and the quality and shape of the weld seam are not good, and the efficiency is low and the labor intensity is high.

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