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Bore welding method of heat exchange tube and tube plate in heat exchanger

A welding method and technology of heat exchange tubes, which are applied in welding equipment, hollow objects, arc welding equipment, etc., can solve the problems of circulating flow, damaged weld seam, difficult repair, etc., and achieve the elimination of welding stress, excellent welding performance, and avoid accumulation The effect of liquid corrosion

Active Publication Date: 2010-01-20
SICHUAN BLUSR MACHINERY
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  • Abstract
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  • Claims
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Problems solved by technology

However, due to the existence of the annular groove on the tube plate in this welding method, the corrosive liquid in the annular groove cannot circulate with the shell side medium, so it is easy to form effusion corrosion, damage the weld and make it difficult to repair

Method used

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  • Bore welding method of heat exchange tube and tube plate in heat exchanger
  • Bore welding method of heat exchange tube and tube plate in heat exchanger
  • Bore welding method of heat exchange tube and tube plate in heat exchanger

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Embodiment Construction

[0020] All the features disclosed in this specification, or all disclosed methods or steps in the process, except for mutually exclusive features and / or steps, can be combined in any manner.

[0021] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless specifically stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is just one example of a series of equivalent or similar features.

[0022] Such as figure 1 with figure 2 As shown, in the method for welding the inner holes of the heat exchange tube and the tube sheet in the heat exchanger of the present invention, a circular hole 2 is first processed on the tube sheet 1, and the diameter of the circular hole 2 is required to be 0.1~larger than the outer diameter of the heat exchange tube 3. 0.3mm, here is designed to be 0.15mm; then overlap the welded end of the heat exchange tube 3 on the circ...

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Abstract

The invention discloses a bore welding method of a heat exchange tube and a tube plate in a heat exchanger, comprising the following steps: processing a circular hole (2) on the tube plate (1), overlapping the welding end of the heat exchange tube (3) on the circular hole (2) of the tube plate (1) during the welding process, performing bore welding at the joint, and inserting the welding end of the heat exchange tube (3) into the circular hole (2) by 0.3-1.8 mm, wherein the diameter of the circular hole (2) on the tube plate (1) is 0.1-0.3 mm larger than the external diameter of the heat exchange tube (3). By welding the heat exchange tube and the tube plate with the method, the invention improves the welding quality and effectively avoids crevice corrosion and deposit fluid corrosion after welding. The bore welding method of a heat exchange tube and a tube plate in a heat exchanger has simple technological operation and excellent welding performance, greatly improves the quality of the heat exchanger and prolongs the service life.

Description

Technical field [0001] The invention relates to a welding method, in particular to a method for welding the inner hole of a heat exchange tube and a tube plate in a heat exchanger. Background technique [0002] The heat exchanger is a widely used equipment in petrochemical and other industries. The welding of the heat exchange tube and the tube sheet is an important process in the manufacture of the heat exchanger, so the welding quality of the heat exchange tube and the tube sheet directly determines the heat exchanger The quality and service life. [0003] The welding of heat exchange tube and tube sheet in traditional heat exchanger is like figure 1 As shown, the corner joint structure is mainly adopted, that is, the heat exchange tube is penetrated into the front end of the tube sheet to form a fillet weld, including three joint forms of flat fillet weld, extended fillet weld and internal fillet weld. In this welding method, there is a gap between the heat exchange tube and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/028B23K101/14
Inventor 刘代富张继云罗晓成向仕荣
Owner SICHUAN BLUSR MACHINERY
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