Method for assembling and welding tube socket on positioning-free table

Abstract

The invention discloses a method for assembling and welding a tube socket on a positioning-table-free table. The method comprises the following steps: step 1, designing a positioning-table-free structural form of the tube socket; 2, a TIG spot welding process is formulated and assembled; 3, an electron beam fixed spot welding process is formulated; 4, an electron beam scanning welding process is formulated; step 5, formulating a defect repair method; and 6, manual TIG repair welding and repairing are conducted. The method has the beneficial effects that the problems of irregular weld beading and wrinkling on the inner wall of the tube socket after the tube socket is welded, no welded inner cavity gap in the inner cavity of the tube socket and the like can be solved, meanwhile, the problem that the weld penetration is easy to deform after the original special TIG welding is solved, the welding deformation is controlled, the subsequent machining precision is improved, and the production efficiency and the product manufacturing quality are improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing nuclear fuel assemblies of power reactors, and in particular relates to a method for manufacturing an upper nozzle of a fuel assembly. Background technique [0002] The upper pipe seat has a special structure and cannot be machined as a whole. It is assembled and welded by parts. figure 1 Shown upper pipe seat is formed by 1 upper connecting plate 1, 4 upper coaming plates 2, 1 upper frame plate 3 groups of welding, altogether 12 weld seams 4. [0003] The existing process uses assembly fixtures to assemble parts and components for TIG spot welding, and then uses a welding robot to perform TIG welding of each weld seam. Tumors and wrinkled skin require manual grinding and inspection, and repeated grinding, frequent rework between processes, low production efficiency and product quality. [0004] The problems of prior art are as follows: [0005] 1) The inner cavity gap exceeds the standar...

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Problems solved by technology

[0006] 2) The problem of wrinkling after machining of the leaf spring groove section of the upper pipe seat

The nuclear-grade 0Cr18Ni10Ti stainless steel used in the pile-type pipe seat, in order to control the content of inclusions, the content of impurity elements S and P is extremely low, which makes the original TIG welding easy to cause the problem of so-called "variability" of penetration depth, and the weld penetration depth is uneven

And there will be problems such as irregular welding bumps, wrinkled skin, and uneven welding shrinkage on the inner wall, which are difficult to completely remove through subsequent machining methods, and the production efficiency is relatively low

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