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Welding method of lower grid plate and angle block

A welding method and technology for lower grids, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of wasting time and money, unqualified nuclear power products, time-consuming and labor-consuming, etc., achieving good economic value and increasing finished products. The effect of pass rate

Inactive Publication Date: 2020-06-23
CNNC JIANZHONG NUCLEAR FUEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the welding process, the dense welding seam brings additional welding deformation and stress to the lower grille. Therefore, it often happens that after the welding is completed, hundreds of circular or semicircular through holes on the outer side of the lower grille become deformed. Oval, which is absolutely unqualified in nuclear power products
[0003] In the existing technology, we can only weld carefully, and then select the one with better quality as a qualified product among the finished products, which is not only time-consuming and labor-intensive, but also wastes a lot of time and money

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for welding a lower grid plate and a corner block, comprising the following specific steps:

[0040] Step 1: Rigid limit of welding parts

[0041] The lower grille and corner block parts are rigidly limited by welding fixtures.

[0042] Step 2: Insert the protective cooling plug

[0043] A cooling plug is inserted into a circle of circular through holes adjacent to the weld on the lower grille, and the plug material can be copper or austenitic stainless steel. The plug and the round hole directly adopt a clearance fit, and the clearance is 0.1mm.

[0044] Step 3: Insert the arc pilot plug

[0045] Insert an arc-starting liner plug into a semicircular through hole near the weld on the lower grille, and the plug is made of red copper. The plug and the round hole directly adopt a clearance fit, and the clearance is 0.1mm.

[0046] Step 4: Base welding

[0047] Carry out tungsten argon arc welding TIG welding for 60 sections of discontinuous short welds witho...

Embodiment 2

[0055] A method for welding a lower grid plate and a corner block, wherein, comprising the following specific steps:

[0056] Step 1: Rigid limit of welding parts

[0057] The lower grille and corner block parts are rigidly limited by welding fixtures.

[0058] Step 2: Insert the protective cooling plug

[0059] A cooling plug is inserted into a circle of circular through holes adjacent to the weld on the lower grille, and the plug material can be copper or austenitic stainless steel. The plug and the round hole directly adopt clearance fit, and the clearance is 0.2mm.

[0060] Step 3: Insert the arc pilot plug

[0061] Insert an arc-starting liner plug into a semicircular through hole near the weld on the lower grille, and the plug is made of red copper. The plug and the round hole directly adopt clearance fit, and the clearance is 0.2mm.

[0062] Step 4: Base welding

[0063] Carry out TIG welding of 60 sections of discontinuous short welds without wire backing, the cu...

Embodiment 3

[0071] A method for welding a lower grid plate and a corner block, wherein, comprising the following specific steps:

[0072] Step 1: Rigid limit of welding parts

[0073] The lower grille and corner block parts are rigidly limited by welding fixtures.

[0074] Step 2: Insert the protective cooling plug

[0075] A cooling plug is inserted into a circle of circular through holes adjacent to the weld on the lower grille, and the plug material can be copper or austenitic stainless steel. The plug and the round hole directly adopt clearance fit, and the clearance is 0.15mm.

[0076] Step 3: Insert the arc pilot plug

[0077] Insert an arc-starting liner plug into a semicircular through hole near the weld on the lower grille, and the plug is made of red copper. The plug and the round hole directly adopt clearance fit, and the clearance is 0.15mm.

[0078] Step 4: Base welding

[0079] Carry out TIG welding of 60 sections of discontinuous short welds without wire backing. The ...

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PUM

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Abstract

The invention discloses a welding method of a lower grid plate and an angle block. The welding method comprises the following steps of step one, rigid limit of welding parts, step two, insertion of aprotective cooling plug, step three, insertion of an arc-initiating liner plug, step four, grounding welding, step five, wire-adding welding, step six, removal of the cooling plug and the arc-initiating liner plug and step seven, removal of the rigid limit of the welding parts. The welding method of the lower grid plate and the angle block has the beneficial effects that using the welding method provided can guarantee that a plane of the lower grid plate not becomes convex or concave after welding is completed, hundreds of circular or semicircular through holes outside the lower grid plate notbecome elliptical, and the burn-through welding defects and air holes not exist in holes near a weld seam of the lower grid plate; and the pass rate of finished products is increased, the waste of materials, personnel and economy is reduced, and a good economic value is provided.

Description

technical field [0001] The invention belongs to a welding method, in particular to a welding method of a lower grid plate and a corner block. Background technique [0002] The lower grid part is one of the key components of the TVS-2M high burnup nuclear fuel assembly of Tianwan Nuclear Power Station, and has an irreplaceable function of constraining and positioning fuel rods and skeleton guide tubes. The lower grille part consists of a lower grille and 6 corner blocks, and the lower grille and the corner blocks are connected by 60 short welds. Due to the safety and dense installation requirements of nuclear power plants, the lower grid parts must ensure that they have very good flatness and hole system position after welding. In addition, during the welding process, the dense welding seam brings additional welding deformation and stress to the lower grille. Therefore, it often happens that after the welding is completed, hundreds of circular or semicircular through holes o...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235B23K9/00
CPCB23K9/0026B23K9/167B23K9/235
Inventor 秦国鹏张丽英盛锋尹富斌李先平刘权洲王科刘章虎
Owner CNNC JIANZHONG NUCLEAR FUEL