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Heat exchange pipe and pipe plate welding method and application thereof

A technology for tube-sheet welding and heat exchange tubes, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of poor fusion of the joint root and the joint structure hindering fluid flow, etc., to strengthen the bonding force and prevent the root gap. Corrosion and the effect of avoiding residual fluid accumulation

Pending Publication Date: 2020-01-14
LUXI IND EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention provides a heat exchange tube and tube sheet welding method and its application to overcome the problems of poor fusion of the root of the welded joint between the heat exchange tube and the tube sheet, joint structure hindering fluid flow, etc.

Method used

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  • Heat exchange pipe and pipe plate welding method and application thereof
  • Heat exchange pipe and pipe plate welding method and application thereof
  • Heat exchange pipe and pipe plate welding method and application thereof

Examples

Experimental program
Comparison scheme
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no. 1 example

[0035] First embodiment , Exemplify a process of welding heat exchange tubes and tube sheets using the method of the present invention, the thickness of the tube sheet 2 is 30mm, and the specifications of the heat exchange tube 2 are made of Φ38×3.5 heat exchangers, and the polishing accuracy requires Ra0.1. Including the following steps:

[0036] (1) Groove processing: reference figure 2 , Use a milling machine to process all pipe holes 4 as required, the pipe hole diameter is φ32.35 0 +0.2 , The groove depth 6 is 6mm, the groove angle 7 is 5mm, and the root arc radius 8 is R5; after completion, the burr of the tube plate hole is cleaned with a wire wheel and an internal grinder and the groove surface is smoothed. Dedicated pipe hole processing size inspection template, timely rectification if the size is unqualified, to ensure that the pipe hole processing size meets the requirements;

[0037] (2) Cleaning the tube plate hole: Use cotton yarn to remove the oil and water stains ...

no. 2 example

[0044] Second embodiment , Exemplify another process of welding heat exchange tubes and tube sheets using the method of the present invention, which specifically includes the following steps:

[0045] (1) Groove processing: use a milling machine to process all pipe holes 4 as required, the pipe hole diameter is φ 32.35 0 +0.2 , The groove depth 6 is 10mm, the groove angle 7 is 6mm, and the root arc radius 8 is R4; after completion, the burr of the tube plate hole is cleaned with a wire wheel and an internal grinder and the groove surface is smoothed. Dedicated pipe hole processing size inspection template, timely rectification if the size is unqualified, to ensure that the pipe hole processing size meets the requirements;

[0046] (2) Cleaning the tube plate hole: Use cotton yarn to remove the oil and water stains on the tube hole groove and the surface of the tube plate. If necessary, use alcohol to clean it.

[0047] (3) Heat exchange tube pairing: Insert heat exchange tube 2 into...

no. 3 example

[0052] The third embodiment , Illustrate another process of welding the heat exchange tube and the tube sheet using the method of the present invention, the same as the second embodiment, the difference is: (1) Groove processing: groove depth 6 is 8mm, groove angle 7 is 4mm, The root arc radius 8 is R6; after completion, use a wire wheel and an internal grinder to clean the burrs of the tube sheet hole and smooth the groove surface. According to the special tube hole processing size inspection template, timely correction of the unqualified size , To ensure that the pipe hole processing size meets the requirements;

[0053] (3) Heat exchange tube pair: the height of the end of the heat exchange tube to be welded below the end surface of the tube plate is 3.0mm.

[0054] After polishing, the nuclear industry-grade penetrant is used for 100% penetrant testing, which meets the requirements of NB / T47013-2015 and is qualified as Class I.

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Abstract

The invention relates to the technical field of heat exchanger preparation, in particular to a heat exchange pipe and pipe plate welding method and application thereof. The method comprises the following steps of (1) chamfering at the edge of a pipe hole, and then inserting a heat exchange pipe into the pipe hole so as to be paired with a pipe plate, wherein the end port of the end to be welded ofthe heat exchange pipe is lower than the end surface of the pipe plate, but the pipe wall of the heat exchange pipe can always contact the wall surface of the pipe hole, and a 'U'-shaped groove is formed; and (2) welding the heat exchange pipe and the pipe plate which are assembled in the step (1), connecting the end surface of the pipe plate and the end port of the end to be welded of the heat exchange pipe through a welding seam, then processing the welding seam to form an arc shape, and enabling the form of the welding seam to be in a streamline shape. According to the heat exchange pipe and pipe plate welding method and the application thereof provided by the invention, the end port of the end to be welded of the heat exchange pipe is lower than the end surface of the pipe plate, namely, the heat exchange pipe is retracted for a certain distance relative to the end surface of the pipe plate, so that the form of the welding seam can be in the streamline shape, meanwhile, the thickness of the welding seam is larger than the thickness of a welding seam under a traditional welding manner, and the binding force between the heat exchange pipe and the pipe plate is improved.

Description

Technical field [0001] The invention relates to the technical field of heat exchanger preparation, in particular to a method for welding a heat exchange tube and a tube sheet and its application. Background technique [0002] The information disclosed in the background of the present invention is only intended to increase the understanding of the overall background of the present invention, and is not necessarily regarded as an acknowledgement or any form of suggestion that the information constitutes the prior art known to those of ordinary skill in the art. [0003] The traditional welding method of heat exchange tube and tube sheet is generally to pass the heat exchange tube through the tube sheet, open a groove on the tube sheet, and then weld the two together (see the accompanying drawings in the manual) figure 1 ). For example, the patent document 201210266605.6 is a welding process for the tube head of a high-pressure heater of 300MW and above. It uses a strip surfacing tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K37/00
CPCB23K31/02B23K37/00
Inventor 黄孝鹏张文明白忠建张龙玲许燕芹
Owner LUXI IND EQUIP
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