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Heat exchanger pipe-pipe plate assembling structure and welding method thereof

An assembly structure and heat exchange tube technology, which is applied in the direction of heat exchanger shell, welding equipment, arc welding equipment, etc., can solve the difficulty in positioning of the tube-tube sheet welding head, the easy deformation of turning and transfer, and the difficulty in positioning of heat exchange tubes and other problems, to avoid thermal influence, easy to melt pool shape, easy to observe the effect

Inactive Publication Date: 2018-10-19
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the tube-tube sheet assembly and welding of the product have difficulties in positioning the heat exchange tubes, and are easily deformed during the turning and transfer process, making assembly difficult; the maximum thickness of the tube sheet is 32.1mm, and its own rigidity is poor, and warping deformation is easily generated during the welding process ;The plane width of the tube sheet is only 128.8mm, and the positioning of the tube-tube sheet welding head is difficult; the distance between the upper and lower tube sheets is large, and if all-position welding is used, the welding operation is difficult

Method used

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  • Heat exchanger pipe-pipe plate assembling structure and welding method thereof
  • Heat exchanger pipe-pipe plate assembling structure and welding method thereof
  • Heat exchanger pipe-pipe plate assembling structure and welding method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A heat exchanger tube-tube plate assembly structure, which comprises: heat exchange tube 2, the heat exchange tube is a groove structure composed of a group of single tubes, and tubes are installed at both ends of the heat exchange tube Plate 1, the protruding length of the heat exchange tube and the end face of the tube plate is 1.5mm, the bevel of the tube plate is 2×45°C; the central axis of the welding torch 4 is 15°C from the vertical centerline of the heat exchange tube Angle, the material of the tube sheet is 022Cr19Ni10, its thickness is 5-32.1mm, the single tube material of the heat exchange tube is 022Cr19Ni10, the diameter is Φ38×2mm, and the heat exchange tube passes through a set of grooves on the fixture 3 The plate is fixed in a horizontal position in the said clamp.

Embodiment 2

[0026] A welding method using the heat exchanger tube-tube sheet assembly structure described in Embodiment 1, the method includes the following steps: installing the heat exchange tube on a fixture, and passing through a set of grooved plates on the fixture The bolts at both ends are pressed tightly, and a tube sheet is installed at both ends of the heat exchange tube. The heat exchange tube adopts an extension structure, and the extension length is 1.5mm from the tube sheet. The specific welding steps are as follows:

[0027] (1) Welding position: Based on the structural characteristics of the heat exchanger, the method of positioning all the heat exchange tubes first and then installing the tube sheet is adopted, and the tube-tube sheet welds are placed in the flat welding position; a fixed-distance assembly combining flexibility and rigidity is designed The fixture, the fixture has the functions of positioning and lifting support, and the middle layer is made of rubber mate...

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Abstract

The invention relates to a heat exchanger pipe-pipe plate assembling structure and a welding method thereof. In current product pipe-pipe plate assembling and welding, positioning of a heat exchangingpipe is difficult, deformation is likely to happen in the overturning and transferring process, the assembling difficulty is large, warping deformation is generated in the welding process, positioning of a pipe-pipe plate welding machine head is difficult, all-position welding is used, and the welding operation is difficult. The heat exchanger pipe-pipe plate assembling structure comprises a heatexchanging pipe (2), and the heat exchanging pipe is of a groove-shaped structure composed of one set of single pipes; the two ends of the heat exchanging pipe are each provided with a pipe plate (1); the end face stretch-out length of the heat exchanging pipe and the pipe plates is 1.5 mm, and pipe plate bevels are 2x45 degrees; a center shaft of a welding gun (4) and the vertical center line ofthe heat exchanging pipe form a 15-degree included angle; the pipe plates are made from a 022Cr19Ni10 material, and the thickness of the pipe plates is 5-32.1 mm; the single pipes of the heat exchanging pipe are made from a 022Cr19Ni10 material, and the diameter is Phi 38x2 mm; and the heat exchanging pipe is fixed to the horizontal position of a fixture through a set of groove-shaped plates on the fixture (3). The heat exchanger pipe-pipe plate assembling structure is used for assembling the heat exchanger pipe with the pipe plates.

Description

Technical field: [0001] The invention relates to a tube-tube sheet assembly structure of a heat exchanger and a welding method thereof. Background technique: [0002] A nuclear power ACP1000 pressurized water reactor nuclear power unit passive containment heat export system heat exchanger, this equipment is a vertical single-pass double tube sheet U-shaped tube structure, which is very different from the conventional shell-and-tube heat exchanger product structure. There is no shell cladding structure, the tube sheet is a "crescent" structure, the length of the tube sheet is about 2m, and the distance between the upper and lower tube sheets is about 5m. Crevice corrosion and other occasions, so the quality of pipe-tubesheet welded joints directly affects the economy and safety of the overall operation of nuclear power units. [0003] At present, the tube-tube sheet assembly and welding of the product have difficulties in positioning the heat exchange tubes, and are easily d...

Claims

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Application Information

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IPC IPC(8): F28F9/18B23K9/167B23K101/14
CPCB23K9/167F28F9/18
Inventor 李淼升马鸣李宜男徐祥久
Owner HARBIN BOILER
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