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Pipe-shell type heat converter pipe plate and hemispherical closing head single-side welding narrow gap welding technology

A heat exchanger and welding process technology, applied in heat exchange equipment, welding equipment, manufacturing tools, etc., can solve the problems of increasing the labor intensity of welding operators, an alarming amount of welding materials, and low product production efficiency, and shorten the production cycle. , The assembly is simple and easy, and the effect of improving the quality of welding

Inactive Publication Date: 2008-04-23
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the main ring seams with relatively large thickness in the heat exchangers produced by power stations in my country are welded by electrode arc welding 1, 2 double-sided welding + ordinary submerged arc automatic welding 3, such as figure 1 As shown, but the main weld of some heat exchangers is restricted by the structure, and the interior cannot be welded, and only one-sided welding can be used. Manual tungsten argon arc welding 4+ electrode arc welding 2+ ordinary submerged arc automatic welding are used. Welding process 3, such as figure 2 As shown, due to the large thickness of the weld, the groove a of the two welded welds increases with the increase of thickness, the thickness changes in the range of 78-280mm, and the value of a changes between 42-92mm, so the welding Long working hours greatly increase the labor intensity of welding operators, and consume an astonishing amount of welding materials, resulting in low production efficiency and prolonging the production cycle

Method used

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  • Pipe-shell type heat converter pipe plate and hemispherical closing head single-side welding narrow gap welding technology
  • Pipe-shell type heat converter pipe plate and hemispherical closing head single-side welding narrow gap welding technology
  • Pipe-shell type heat converter pipe plate and hemispherical closing head single-side welding narrow gap welding technology

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Experimental program
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Embodiment

[0027] Such as image 3 As shown, it is a schematic diagram of welding the tube sheet of the shell-and-tube heat exchanger and the hemispherical head, and the main weld 7 of the tube sheet 5 of the shell-and-tube heat exchanger and the hemispherical head 6 is welded.

[0028] Such as Figure 4 As shown, it is a schematic diagram of the narrow gap welding process of the tube sheet and the hemispherical head of the shell-and-tube heat exchanger. The method is:

[0029] Step 1: Determine the main weld groove width

[0030] The main weld groove angle β decreases with the increase of the thickness, the thickness H is in the range of 170mm, and the angle changes at 1°, ensuring that the width of the main weld groove a is 32mm;

[0031] Step 2: The bottom layer is welded with a model NSA4-300 manual argon arc welding machine with a pen-type manual argon arc welding torch. The welding material is a mushroom-shaped melting lining ring. The thickness of the bottom layer is 3mm. Flow...

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Abstract

The present invention relates to a shell-and-tube heat exchanger and hemispherical head one-side weld narrow gap welding process. It is characterized by that its backing weld adopts pen-type manual argon shielded are welding process, its welding material adopts mushroom-type consumable backing ring; the transion weld adopts electrode electric arc welding process, adopts spray coating spatter-proof material; and its main weld adopts narrow gap submerged-arc automatic welding process.

Description

technical field [0001] The invention relates to a single-side welding narrow gap welding process between a tube plate and a hemispherical head of a shell-and-tube heat exchanger, in particular to a main annular seam between a relatively thick hemispherical head and a tube plate of a shell-and-tube heat exchanger The invention relates to a narrow-gap welding process of single-side welding, which can be used for welding main ring seams or ring seams of heat exchangers and other pressure vessels, and belongs to the field of welding technology. Background technique [0002] At present, the main ring seams with relatively large thickness in the heat exchangers produced by power stations in my country are welded by electrode arc welding 1, 2 double-sided welding + ordinary submerged arc automatic welding 3, such as figure 1 As shown, but the main weld of some heat exchangers is restricted by the structure, and the interior cannot be welded, and only one-sided welding can be used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/18B23K9/095B23K9/235B23K33/00B23K101/14
Inventor 陈龙鹤周彦伟王晖
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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