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A welding method for tube and tube sheets of sodium-cooled fast reactor evaporator

A welding method and sodium-cooled fast reactor technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as burning tubes, achieve the effects of preventing cracks, improving welding efficiency, and avoiding multiple preheating

Active Publication Date: 2022-06-24
HARBIN WELDING INST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, due to the extension length of the nozzle is 5mm, the cumulative heat of 3 rounds of continuous welding at high preheating temperature will easily lead to burning of the nozzle (such as figure 2 The part circled in the middle)

Method used

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  • A welding method for tube and tube sheets of sodium-cooled fast reactor evaporator
  • A welding method for tube and tube sheets of sodium-cooled fast reactor evaporator
  • A welding method for tube and tube sheets of sodium-cooled fast reactor evaporator

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Experimental program
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Effect test

Embodiment 1

[0054]In a fourth-generation sodium-cooled fast reactor evaporator, the forging tube sheet material is SA-336M Gr.F22 CI.1, the thickness is 300mm, the tube specification is SA-213M T22, the diameter is 16mm, the wall thickness is 2.5mm, and the wire material is ER90S-B3, the specification is 0.9mm. The form of the joint is the overhang type, and the length of the tube mouth is 5mm. The welding throat size is required to be not less than 2.5mm. The welding steps are as follows:

[0055] Step 1. Before welding, remove oxides, oil stains and other harmful impurities within 60mm of the plate surface of the tube to be welded and both sides of the heat exchange tube.

[0056] Step 2. Use mechanical expansion to position and expand the heat exchange tube and the tube sheet, fix the relative position of the heat exchange tube and the tube sheet, and meet the requirement that the extension length of the evaporator heat exchange tube is 5 mm.

[0057] Step 3. Use intermediate freque...

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Abstract

The invention provides a welding method for a tube plate of a sodium-cooled fast reactor evaporator, belonging to the technical field of welding. In the process of all-position welding, different positions of the molten pool are different due to the comprehensive effects of gravity, arc force, surface tension, etc. The process parameters such as the distance from the tube wall are divided into zones. By controlling the parameters of each zone, the problem of burning the tube mouth caused by the accumulation of 3 rounds of continuous welding heat at a high preheating temperature is avoided. When the welding torch rotates to 1110°, the current begins to gradually decay. At the same time, continue to feed the wire for 0.1-3s to ensure that there is no crack in the arc, and the welding torch will continue to rotate for 3-10s when the current decays to further prevent cracks. The invention adopts 3 rounds of continuous welding, which avoids multiple preheating and improves welding efficiency.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a welding method for a tube sheet of a sodium-cooled fast reactor evaporator. Background technique [0002] like figure 1 As shown, the material of the forging tube sheet in a 4th generation sodium-cooled fast reactor evaporator is SA-336M Gr.F22CI.1, the thickness is 300mm, the tube specification is SA-213M T22, the diameter is 16mm, the wall thickness is 2.5mm, and the welding wire The material is ER90S-B3 and the specification is 0.9mm. The form of the joint is the overhang type, the length of the pipe plate is 5mm outside the nozzle, and the size of the weld throat is required to be not less than 2.5mm, so a single joint needs 3 welds to ensure the size of the weld throat. At present, most of the tube sheet welding equipment on the market do not have the function of multi-layer continuous wire welding because the rotation radius guide of the welding torch is manually adjust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/235B23K9/133B23K9/10
CPCB23K9/167B23K9/235B23K9/133B23K9/10
Inventor 费大奎张焱李荣靳彤齐万利杨战利孙少华李波杨义成赵树全曹永陈振伟张锋王春强
Owner HARBIN WELDING INST LTD