Method for welding inner hole of heat exchanger

A welding method and heat exchanger technology, applied in welding equipment, arc welding equipment, heat exchange equipment, etc., can solve the problems of inconvenient observation of welding quality, inability to release stress, affecting welding quality, etc., and achieve good welding. performance, reducing welding stress and increasing service life

Active Publication Date: 2006-06-28
TIANJI COAL CHEM IND GROUP +1
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Problems solved by technology

[0006] Although this inner hole welding method is simple to process the tube sheet, the heat exchange tube can be inserted into the concave platform during welding, and the butt connection between the heat exchange tube and the tube sheet is convenient, but there are also shortcomings. First, the stress after welding cannot be released; secondly, During welding, the temperature rise of the tube sheet is slower than that of the heat exchange tube, which affects the welding quality; at the same time, since the weld seam is located inside the tube sheet, it is not convenient to observe the quality of the welding after welding

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  • Method for welding inner hole of heat exchanger

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Embodiment Construction

[0018] The low-pressure reaction water condenser is an important equipment for the production of nitric acid. The equipment is a shell-and-tube heat exchanger with a total length of 14.6m and a tube plate diameter of φ2124mm. There are 2020 heat exchange tubes evenly distributed on the tube plate, and the heat exchange area of ​​the equipment is 1798m2 2 , net weight 48055Kg.

[0019] When manufacturing a low-pressure reaction water condenser, the internal parts of the condenser, including tube sheets, heat exchange tubes, baffles, and tie rods, are processed first, and then the blanking and rolling of the tube sections and the assembly between the tube sections are carried out. And welding and other processes, the simplified body of the heat exchanger is made, and then the tube bundle is assembled and the heat exchange tube is threaded, and then the tube bundle is inserted into the heat exchanger cylinder, and the inner hole welding is prepared for butt joint with the tube pla...

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Abstract

An internal hole welding method for heat exchanger includes such steps as machining circular hole on tube plate, machining a circular slot around the circular hole for releasing stress, butt connection between heat exchanging tube and the boss between slot and hole, inserting the argon arc welding torch in the hole, and welding.

Description

technical field [0001] The invention relates to a welding method, which is suitable for the argon arc welding between the heat exchange tube and the tube plate of the heat exchanger. Background technique [0002] The common welding method between the heat exchange tube and the tube sheet of the heat exchanger is on the outside of the tube sheet, and the heat exchange tube passing through the tube sheet is welded together with the tube sheet by means of argon arc welding, which belongs to the form of fillet weld . In this welding method, when the process medium flows into the heat exchange tube, it will directly wash the weld seam. [0003] The low-pressure reaction water condenser is an important equipment for the production of nitric acid, and its function is to quickly condense the condensate in the nitrogen oxide gas. The tube-side medium of the heat exchanger is nitrogen oxide (moderate hazard), and the shell-side medium is condensed water. Due to the harsh working en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/028B23K101/14
Inventor 郭继承陈亮王彦灵彭卫华姬天德
Owner TIANJI COAL CHEM IND GROUP
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