An electron beam welding method for heat exchange tubes and tube sheets in a tube heat exchanger
A tubular heat exchanger and electron beam welding technology, which is applied to electron beam welding equipment, welding equipment, hollow objects, etc., can solve problems affecting production efficiency, improve production efficiency, reduce production costs, and avoid occlusion problems Effect
Active Publication Date: 2019-04-02
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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Problems solved by technology
[0005] The invention patent application with the application number CN201610396529.9 discloses an electron beam welding method for tubes and tube sheets in titanium alloy heat exchangers. Although this method can solve the welding problem of heat exchange tubes and tube sheets in this type of heat exchanger, However, for tube sheets with larger diameters and heat exchangers with more heat exchange tubes, it is not easy to achieve heat exchange by moving in two horizontal directions (movement on X track and Y track in CN201610396529.9) The result of the final rotation of the tube around its own axis will affect the production efficiency. Therefore, it is necessary to propose a new electron beam welding method to improve the welding efficiency of the heat exchange tube and the tube sheet in this type of heat exchanger, and to make up for the above patent application. Disadvantages of the disclosed technical solutions
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Embodiment 1
[0047] According to the above specific implementation manner, taking the welding between the heat exchange tube and the tube sheet made of titanium alloy as an example, the present invention, especially the application of some parameters therein, is further described.
[0048] In this embodiment, the material of the heat exchange tube and the tube sheet are both TA2, the specification of the heat exchange tube is Φ15×2 (that is, the outer radius R of the heat exchange tube is 7.5mm, and the thickness is 2mm), and the heat exchange tube extends out of the tube sheet The length of the upper end is 500mm, and the distance between the centerlines of adjacent heat exchange tubes is 20mm.
[0049] The specific operation steps are as follows:
[0050] 1) Clean the remaining oil on the heat exchange tubes and tube sheets to be welded by pickling, and then wipe them with acetone.
[0051] 2) Install the plurality of heat exchange tubes 1 to be welded into the corresponding mounting ho...
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By means of an electron beam welding method for heat exchange pipes and a pipe plate in a tubular heat exchanger, beam spots of an electron beam can do circular motion around a point, the heat exchange pipes and the heat plate do horizontal motion together with the point as the circle enter, and therefore the beam spots can move on weld joints between the to-be-welded heat exchange pipes and the pipe plate all the time, and welding between the heat exchange pipes and the pipe plate is achieved. Due to the adoption of the electron beam welding method, the shielding problem caused when the heat exchange pipes are welded on the pipe plate in batches can be avoided, the heat exchange pipes and the pipe plate can be reliably welded in batches, operation is easy and convenient, the production efficiency can be improved, and the production cost can be reduced.
Description
technical field [0001] The invention belongs to the field of metal material welding, and in particular relates to an electron beam welding method for a heat exchange tube and a tube plate in a tube heat exchanger. Background technique [0002] Tubular heat exchangers have a series of advantages such as extremely high thermal conductivity, good isothermal properties, compact structure, and controllable temperature. At present, they are widely used in metallurgy, chemical industry, oil refining, boilers, machinery and other industries, and have achieved significant economic benefits. It also has a very broad application prospect in the field of marine ships and submarines. In the traditional heat exchanger, the connection between the tube and the tube sheet is a simple form of end sealing welding, and only ordinary automatic or manual TIG welding (tungsten inert gas welding) can be used to meet the requirements. [0003] However, for a new type of heat exchanger such as figu...
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IPC IPC(8): B23K15/00
CPCB23K15/0006B23K15/0033B23K2101/14
Inventor 耿永亮高奇刘希林郭立栋韩林举
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP