Electron beam welding method for variable-section gas turbine casing

An electron beam welding and gas turbine technology, which is applied in electron beam welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems such as the inability to meet the cylinder body and the variable-section horizontal flange, and achieve convenient welding methods and welding seam forming. The effect of good quality, improving product quality and production efficiency

Active Publication Date: 2012-04-18
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing welding method between the cylinder body and the horizontal flange with equal cross-section in the casing of the gas turbine can not satisfy the problem of welding the cylinder body and the horizontal flange with variable cross-section, and then provide a gas turbine casing with variable cross-section structure electron beam welding method

Method used

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  • Electron beam welding method for variable-section gas turbine casing
  • Electron beam welding method for variable-section gas turbine casing
  • Electron beam welding method for variable-section gas turbine casing

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specific Embodiment approach 1

[0007] Specific implementation mode one: combine Figure 1 ~ Figure 2 Illustrate embodiment, the electron beam welding method of a kind of variable section structure gas turbine case of present embodiment is to realize according to the following steps: one, select electron beam welding machine; The surface of the workbench in the vacuum chamber of the welding machine; the casing 1 is composed of two variable-section horizontal flanges 1-1 and a cylinder body 1-2; 3. Put the casing and the tooling fixture cleaned in step 2 into the welding machine. On the workbench in the vacuum chamber of the machine, assemble the casing 1 on the tooling fixture, adjust the parallelism and verticality of the two variable-section horizontal flanges 1-1 and the cylinder body 1-2; adjust the electron gun 2 and the variable-section horizontal method The distance between the flanges 1-1, the two variable cross-section horizontal flanges 1-1 and the cylinder 1-2 are positioned and spot welded, 4. El...

specific Embodiment approach 2

[0008] Specific implementation mode two: combination figure 2 The embodiment is described. The difference between this embodiment and the first embodiment is that the distance f between the electron gun 2 and the lower surface I of the variable cross-section horizontal flange 1-1 in step 4 is 200mm-350mm. Others are the same as in the first embodiment.

[0009] The cleaning of each surface of the casing, the surface of the fixture and the surface of the workbench in the vacuum chamber of the welding machine described in this embodiment is mainly to remove the rust, scale, paint, oil, emulsion, etc. on the surfaces of the parts to be welded, focusing on the horizontal method Clean the butt surface of the flange and the cylinder to be welded and the surrounding area of ​​20mm, and at the same time clean the dust, oil and other dirt on the surface of the workbench and each fixture.

[0010] The distance between the electron gun 2 and the lower surface I of the variable-section ...

Embodiment

[0011] Example: such as image 3 As shown, in this embodiment, the selected voltage is 60KV, and the vacuum chamber volume of 60KW is 49M 3 Electron beam welding machine with a thickness of 16.7mm ~ 36.3mm and a length of 692mm for welding with a variable cross-section horizontal flange and the cylinder, and the vacuum degree in the vacuum chamber reaches 5.5×10 -2 Pa~8.8×10 -2 Pa, the vacuum degree of the electron gun of the welding machine is 8.0×10 -3 Pa~9.6×10 -3 Under the condition of Pa, the variable cross-section flange is divided into 9 sections for welding. The first section is electron beam welding with thickness D1 of 16.7mm and displacement L1 of 17mm; the second section is of thickness D1 from 16.7mm to D2. 21.7mm, displacement L2 is 60mm variable thickness electron beam welding; the third section is thickness D2 is 21.7mm, displacement L3 is 68.5mm equal thickness electron beam welding; the fourth section is thickness D2 is 21.7 to D1 is 16.7mm, displacement L...

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Abstract

The invention relates to an electron beam welding method for a variable-section gas turbine casing, relating to a welding method for a gas turbine casing and solving the problem that the existing welding method for a cylinder and a horizontal flange of the same section in the gas turbine casing cannot meet welding requirements for the cylinder and the horizontal flange of the variable section. The method comprises: 1, selecting an electron beam welding machine; 2, cleaning; 3, arranging the cleaned casing and a tool clamp onto a workbench in a vacuum chamber of the welding machine, assemblingthe casing onto a tool, positioning two variable-section horizontal flanges and a cylinder, and carrying out spot welding; and 4, carrying out electron beam welding. The multi-section welding is adopted for the variable-section horizontal flanges with different thicknesses, the welding of the horizontal flanges of different thicknesses for the variable-section casing can be realized through adjusting and selecting the current, voltage, gun distance and other parameters of the welding machine, and the product quality and the production efficiency can be improved greatly. The method can be applied in welding of the variable-section gas turbine casing.

Description

technical field [0001] The invention relates to a welding method for a casing of a gas turbine. Background technique [0002] The welding quality of the horizontal flange of the gas turbine casing is very important to the production of the product. The existing horizontal flange of the casing is a welded structure of equal thickness, and the process parameters remain basically unchanged during welding. For a good welded joint, the electron beam welding of variable thickness parts is much more complicated, especially the form and area of ​​thickness change, which is the most difficult requirement for electron beam welding technology, while the existing horizontal flange process method of equal thickness welding structure And the welding parameters cannot meet the requirements of the horizontal flange with variable cross-section welding structure. The reason is that the change rate of the multi-section variable-thickness horizontal flange joints is different and the stroke is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06
Inventor 王金刚焦俊锋张修環石淑莲宫在龙刘滨黄荣海彭勇李旭瑞门士然
Owner HARBIN TURBINE
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