Preparation method of titanium alloy pin fin tube by adopting electron beams

A titanium alloy needle and electron beam technology, applied in electron beam welding equipment, metal processing equipment, welding equipment, etc., can solve the problems that titanium alloy pin-fin tubes cannot be prepared, reduce the tube bundle diameter ratio, and weld defects, etc., and achieve Reliable preparation, reduced tube bundle diameter ratio, and compact tube bundle

Active Publication Date: 2018-02-02
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides an electron beam preparation method for titanium alloy pin-fin tubes, which solves the problem that the existing titanium alloy pin-fin tubes cannot be prepared, and at the same time can eliminate contact thermal resistance, increase the distribution density of pin-fins, and increase the The length-to-diameter ratio of the fins can obtain a larger secondary heat transfer surface, and can also reduce the section-to-diameter ratio of the tube bundle, making the tube bundle more compact
Avoid welding oxidation, welding defects and other problems

Method used

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  • Preparation method of titanium alloy pin fin tube by adopting electron beams
  • Preparation method of titanium alloy pin fin tube by adopting electron beams
  • Preparation method of titanium alloy pin fin tube by adopting electron beams

Examples

Experimental program
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Effect test

preparation example Construction

[0020] Such as figure 1 Shown, a kind of titanium alloy pin-fin tube electron beam preparation method comprises the following steps:

[0021] Step 1. Cleaning: Pickling the base pipe to be processed to remove the surface oxide film until the metallic luster is revealed, rinse the base pipe with water, and then clean the part to be welded with acetone or alcohol;

[0022] Step 2. Preparation: put the substrate tube to be processed together with the tooling into the area to be welded. For electron beam processing, it needs to be placed in a vacuum chamber and vacuumized; processing: for electron beam processing, when the vacuum degree reaches 5×10 -4 At mbar, start the welding process, use surface focus or upper focus, line scan, circular scan or helical scan, scan frequency 0-1000Hz, scan amplitude 0-5mm, manufacturing scan speed 0.1-5m / s, welding voltage 60- 150KV, beam current 1-20mA, electron beam focus radius 0.2-1mm, the base tube rotates on the tooling at a linear speed ...

Embodiment 1

[0024] Example 1 Titanium Alloy Helical Scanning

[0025] Pickle the Ti31 base pipe to be processed to remove the surface oxide film until the metallic luster is revealed, rinse with water, and then clean the part to be welded with acetone or alcohol;

[0026] Put the substrate tube to be processed into the area to be welded together with the tooling. For electron beam processing, it needs to be placed in a vacuum chamber and vacuumized; when the vacuum degree reaches 5×10 -4 At mbar, start welding, use surface focus, helical scanning, scanning frequency 1000Hz, scanning amplitude 1mm, manufacturing scanning speed 0.1m / s, welding voltage 150KV, beam current 2.5mA, electron beam focus radius 0.3mm, welding torch distance from workpiece The distance is 500mm.

[0027] After the processing is completed, the heat treatment furnace is used for vacuum stress relief annealing treatment, and the vacuum degree is 5×10 -3 Pa, temperature 450°C, time 30min. After heat treatment, the re...

Embodiment 2

[0028] Example 2 Titanium Alloy Linear Scanning

[0029] Pickle the Ti31 base pipe to be processed to remove the surface oxide film until the metallic luster is revealed, rinse with water, and then clean the part to be welded with acetone or alcohol;

[0030] Put the substrate tube to be processed into the area to be welded together with the tooling. For electron beam processing, it needs to be placed in a vacuum chamber and vacuumized; when the vacuum degree reaches 5×10 -4 At mbar, start welding, use surface focus, linear scanning, one-way scanning from both ends to the center, scanning frequency 1000Hz, scanning amplitude 10mm, manufacturing scanning speed 5m / s, welding voltage 90KV, beam current 20mA, electron beam focal radius 0.3mm, the distance between the welding torch and the workpiece is 1000mm.

[0031] After the processing is completed, the heat treatment furnace is used for vacuum stress relief annealing treatment, and the vacuum degree is 5×10 -3 Pa, temperatur...

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Abstract

The invention relates to a preparation method of a titanium alloy pin fin tube by adopting electron beams. The preparation method comprises the following steps: 1, cleaning; 2, starting welding according to design: scanning the surface of a parent tube by adopting the surface focus or upper focus according to the scanning frequency, the scanning amplitude, the manufacturing scanning speed, the welding voltage, the beam current and the electron beam focus radius, enabling the parent tube to rotate on the tooling at the linear speed of 0.2 m / min, and then performing electron beam welding according to that the welding distance between the welding gun and the workpiece is 200-1000 mm, wherein the electron beam machining is carried out in a vacuum chamber; and 3, performing vacuum destressing annealing treatment. The preparation method of the titanium alloy pin fin tube by adopting the electron beams has the benefits as follows: the problem that the conventional titanium alloy pin fin tubecannot be prepared is solved, the contact thermal resistance is eliminated, the distribution density of pin fins is improved, the length-to-diameter ratio of the pin fins is increased, a larger secondary heat-transfer surface is obtained, the pitch diameter ratio of the tube bundle is reduced, the tube bundle is more compact, problems such as welding oxidation and welding defects are avoided, andthe overall effective heat exchange area of the pin fins is greatly increased.

Description

technical field [0001] The invention relates to the technical field of processing titanium alloy components, in particular to an electron beam preparation method of a titanium alloy pin-fin tube. Background technique [0002] At present, the heat exchange of high-viscosity liquids in China mostly adopts bare tubes due to the serious fouling and coking. After a period of use, the heat transfer efficiency is extremely low due to fouling and coking, which cannot meet the production requirements. For the heat exchange of oil products, although low-fin threaded tubes have been used in recent years to expand the heat transfer area, there is still a certain limit to the enhanced heat transfer, and the serious coking has not been solved well, and it has not been applied to It is suitable for high-viscosity media such as residual oil, heavy oil and oil slurry, and the processing is troublesome. For the convection section and waste heat recovery in various industrial heating furnace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06
CPCB23K15/0006B23K15/0033B23K15/0046B23K15/06
Inventor 高福洋金向东高奇郁炎李培跃刘志颖蒋鹏
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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