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Method for welding butt joint of large thick wall pipelines in nuclear power station

A technology of butt joints and large and thick walls, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., and can solve the problems of large gap between groups, inability to complete welding of pipe sections, and burn-through of blunt edges of grooves.

Inactive Publication Date: 2015-12-16
CHINA NUCLEAR IND 23 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, although tungsten staining and weld oxidation can be avoided, and the welding efficiency and the protective effect of the shielding gas can be improved, however, due to the large pair gap, the arc generated during welding is concentrated on the blunt edge of the groove, resulting in It is easy to be burned through due to excessive heat concentration, which will cause the butt welding of pipe sections to fail to complete

Method used

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  • Method for welding butt joint of large thick wall pipelines in nuclear power station
  • Method for welding butt joint of large thick wall pipelines in nuclear power station
  • Method for welding butt joint of large thick wall pipelines in nuclear power station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Welding a welding test piece at the 5G position, the material is TP316LN stainless steel, φ952.5×82.6mm, and the thickness of the blunt edge of the groove is 2.16-2.41mm

[0041] The specification of the welded test piece is φ952.5×82.6mm, that is, the outer diameter of the pipe is 952.5mm, the wall thickness is 82.6mm, the material is TP316LN stainless steel, and the unilateral slope of the groove is 5°. When welding, the welding equipment is the GTVI all-position automatic welding machine from LIBURDI Company in Canada; the tungsten electrode adopts polished cerium tungsten electrode, and the diameter of the tungsten electrode is 4.0mm, the taper is 30°, and the platform diameter is 0.8-1.2mm; the welding wire adopts It is ER316L welding wire (stainless steel welding wire produced by Manchester, UK), and the diameter of the welding wire is 1.0mm; the shielding gas is 99.999% Ar.

[0042] The corresponding values ​​of the pairing gap of the pipeline to be we...

Embodiment 2

[0049] Example 2: Welding a welding test piece at the 5G position, the material is TP316LN stainless steel, φ952.5×82.6mm, and the thickness of the blunt edge of the groove is 2.16-2.41mm

[0050] The specification of the welded test piece is φ952.5×82.6mm, that is, the outer diameter of the pipe is 952.5mm, the wall thickness is 82.6mm, the material is TP316LN stainless steel, and the unilateral slope of the groove is 5°. When welding, the welding equipment is the GTVI all-position automatic welding machine from LIBURDI Company in Canada; the tungsten electrode adopts polished cerium tungsten electrode, and the diameter of the tungsten electrode is 4.0mm, the taper is 30°, and the platform diameter is 0.8-1.2mm; the welding wire adopts It is ER316L (stainless steel welding wire produced by British Manchester Company), and the diameter of the welding wire is 1.0mm; the shielding gas is 99.999% Ar.

[0051] The corresponding values ​​of the pairing gap of the pipe to be welded at...

Embodiment 3

[0058] Example 3: Welding a welding test piece at the 6G position, the material is TP316LN stainless steel, φ457×45mm, and the thickness of the blunt edge of the groove is 2.16-2.41mm

[0059] The specification of the welded test piece is φ457×45mm, that is, the outer diameter of the pipe is 457mm, the wall thickness is 45mm, the material is TP316LN stainless steel, and the unilateral slope of the groove is 6°. When welding, the welding equipment is the GTVI all-position automatic welding machine from LIBURDI Company in Canada; the tungsten electrode adopts polished cerium tungsten electrode, and the diameter of the tungsten electrode is 4.0mm, the taper is 30°, and the platform diameter is 0.8-1.2mm; the welding wire adopts It is ER316L (stainless steel welding wire produced by British Manchester Company), and the diameter of the welding wire is 1.0mm; the shielding gas is 99.999% Ar.

[0060] The values ​​corresponding to the pair gaps of the pipes to be welded at different ...

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Abstract

The invention relates to the field of building of nuclear power stations, in particular to a method for welding a butt joint formed by assembling large thick wall pipelines in a nuclear power station, and provides a method for welding a butt joint of large thick wall pipelines of a nuclear power station to lower welding difficulty and improve the welding efficiency and effect. The outer diameter of the large thick wall pipelines ranges from 450 mm to 1,100 mm, the pipe wall thickness ranges from 30 mm to 100 mm, and the pipelines are assembled to form an assembling clearance gradually increased from the 0-degree position of the butt joint to the 180-degree position of the butt joint. Back argon shielding is carried out in the welding process. Melt welding is carried out to form a penetration weld bead, and welding current is gradually increased. Support welding is carried out to form a plurality of supporting weld beads, and bottoming welding is completed. Filling welding is carried out, and when the root width of weld seams is smaller than or equal to 10 mm, single-layer and single-weld-bead welding is adopted. When the root width of the weld seams is larger than 10 mm, single-layer and multi-weld-bead welding is adopted till filling welding is completed. Covering welding is carried out to form a covering weld bead, and welding is finished. The welding method is low in operation difficulty, good in welding effect and high in efficiency.

Description

technical field [0001] The invention relates to the field of nuclear power plant construction, in particular to a method for welding the butt joints formed by pairs of large thick-walled pipelines in the nuclear power plant. Background technique [0002] During the construction of AP1000 of the third-generation nuclear power plant, the interconnected devices were all connected by pipelines. Pipelines in nuclear power plants are usually formed by connecting multiple pipe sections by welding. When welding two adjacent pipe sections of the main pipe in a nuclear power plant, that is, a large thick-walled pipe, a slope is usually provided at the end of the pipe section, and a single U-shaped slope is formed after the two adjacent pipe sections are paired. mouth. In the early stage of welding, the root width of the weld seam narrows with the increase of the number of weld bead layers, even less than 5mm, while the diameter of the tungsten electrode used for welding is usually 4...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235
CPCB23K9/167B23K9/0026B23K9/235
Inventor 冯英超申浩李竹渊范凯张东辉张伟栋张岩
Owner CHINA NUCLEAR IND 23 CONSTR
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