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Connection structure, nuclear reaction instrument casing and secondary support column and welding method

A connection structure and welding method technology, which is applied in nuclear reactor monitoring, reactors, welding equipment, etc., can solve problems such as improper operation, incomplete welding, and difficult processing and manufacturing, and achieve the effect of simple design and convenient processing

Active Publication Date: 2015-09-23
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of industry, the manufacturing process has also been greatly improved, and a series of processing and manufacturing difficulties brought about by the plug-in structure, and problems such as the inability to protect the backside during welding have also emerged.
In the manufacturing process of instrument casings in million-kilowatt nuclear power plants, due to the change of welding machines and improper operation of welding operators, defects such as pores and incomplete penetration have occurred in the volume inspection of full penetration butt welds of multiple instrument casing strings
However, the plug-in design makes the volume inspection of the weld unreachable, and the quality of the weld cannot be guaranteed, which increases the risk of accidents during the operation of the welded joint.

Method used

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  • Connection structure, nuclear reaction instrument casing and secondary support column and welding method
  • Connection structure, nuclear reaction instrument casing and secondary support column and welding method
  • Connection structure, nuclear reaction instrument casing and secondary support column and welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 , 2 , 3, 4 shown.

[0029] The connection structure includes welded joint A and welded joint B. Welded joint A and welded joint B are butt welded by full penetration butt welding. After butt welding of welded joint A and welded joint B, there is a single U-shaped slope on the outer diameter surface There is a smooth transition groove on the inner diameter surface, the opening direction of the smooth transition groove and the single U-shaped groove are opposite, and the connection area between the smooth transition groove and the single U-shaped groove is the body of the welded joint A With the body of the welding joint B, the connecting seam after the butt joint of the welding joint A and the welding joint B is located between the smooth transition groove and the single U-shaped groove, and the single U-shaped groove is filled with a solder layer.

[0030]The welding area of ​​the present invention is the gap between the welding joint A and the weldin...

Embodiment 2

[0038] Such as figure 1 , 2 , 3, 4 shown.

[0039] Since the instrument bushings of nuclear power plants are divided into Type I instrument bushings, Type II instrument bushings, Type III instrument bushings, Type IV instrument bushings and Type V instrument bushings, the standards of each bushing are inconsistent. There are therefore also differences in the process of joining the parts.

[0040] Therefore, the nuclear reaction instrument casing that is convenient for welding includes the connection structure described in the first embodiment, the welding joint A is an A-shaped cylinder 2, the welding joint B is a flange welding joint 1; or the welding joint A is a V-shaped instrument sleeve Pipe upper flange 4, welding joint B is the upper extension tube 3 of V-shaped instrument casing; or welding joint A is B-shaped cylinder 6, and welding joint B is the upper extension tube 5 of B-type.

[0041] A-type cylinder 2 is a type I instrument bushing cylinder, a type III instru...

Embodiment 3

[0053] The difference between this embodiment and Embodiment 1 is that the vertical section 9 and the vertical section 15 can also have a structure with a small inclination angle, that is, the inner concave surface of the smooth transition groove is mainly composed of the chamfered section A12 and the tapered section 11 connected in sequence. , chamfering section B10, vertical section A9, chamfering section C8, parallel section A7, parallel section B13, chamfering section D14, vertical section B15, chamfering section E16, vertical section A9 and vertical section B15 are connected with welding joint A The axis of A12 forms an included angle less than 90 degrees and greater than 0 degrees. The parallel segment A7 and the parallel segment B13 are parallel to the axis of the welded joint A. One end of the chamfered segment A12 is smoothly transitioned to the welded joint B, and the other end of the chamfered segment A12 Smooth transition connection with the cone angle section 11, o...

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Abstract

The invention discloses a connection structure, a nuclear reaction instrument bushing, a secondary supporting column and a welding method. The connection structure comprises a welding joint A and a welding joint B, wherein the welding joint A is in butt joint with the welding joint B in a full penetration butt welding mode; after the welding joint A is in butt joint with the welding joint B, the section on the external diameter surface of the butt-jointed welding joints is a single U-shaped bevel, and the section of the internal diameter surface of the butt-jointed welding joints is a smooth transition groove; the openings of the smooth transition groove and the single U-shaped bevel are in reverse directions; a connection region between the smooth transition groove and the single U-shaped bevel is the body of the welding joint A and the body of the welding joint B; a joint seam of the butt-jointed welding joint A and welding joint B is positioned between the smooth transition groove and the single U-shaped bevel; and the single U-shaped bevel is filled with a solder layer. The novel design has the advantages of simple design, and convenience in machining, control over the welding seam quality and volumetric examination of a welding seam and the like.

Description

technical field [0001] The invention relates to a structural design for an instrument bushing and a secondary support column in a pressurized water nuclear reactor internal component. Specifically, it refers to a connection structure and its composed instrument bushing and secondary support column and its welding method. Background technique [0002] In the structural design of nuclear reactor internals in pressurized water power plants, instrument bushings and secondary support components are important components of the lower internals. The instrument bushings of million-kilowatt nuclear power plants are divided into type I, type II, type III, type IV and type V of instrument bushings. The instrument bushings of 600MWe nuclear power plants are divided into type I, type II and type III of instrument bushings. There are two secondary support columns, hollow and solid. The instrument sleeve provides continuous guidance and positioning for the finger sleeve of the neutron fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00B23K9/235B23K9/167G21C17/00
CPCY02E30/30
Inventor 王庆田李燕胡朝威夏欣赵伟李宁饶琦琦李娜李浩舒翔
Owner NUCLEAR POWER INSTITUTE OF CHINA