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Seal welding method of titanium pipe and titanium tube plate of all-titanium condenser

A condenser and sealing welding technology, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of low connection strength, poor air tightness, leaking pipe and tube sheet joints of expansion tubes, etc., to avoid welding The effects of current fluctuations, shortening the construction period, and enhancing the protection effect

Inactive Publication Date: 2011-04-20
哈尔滨北方电力开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, another cause of leakage is caused by slight leakage at the connection between the tube and the tube sheet
The thin-walled titanium tube is very thin, with a wall thickness of only 0.5-0.7 mm, and poor expandability, so the connection strength of the expanded tube is low and the airtightness is poor

Method used

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  • Seal welding method of titanium pipe and titanium tube plate of all-titanium condenser
  • Seal welding method of titanium pipe and titanium tube plate of all-titanium condenser
  • Seal welding method of titanium pipe and titanium tube plate of all-titanium condenser

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A sealing welding method between titanium tube and titanium tube plate of an all-titanium condenser. The parameters are selected according to the requirements of the forming size. First, the width of the weld bead is required not to exceed half of the width of the hole bridge, that is, <3mm. Second, the weld bead reinforcement and the tube The size of the inner protrusion is even; when welding titanium, use argon gas to protect the front side of the weld, the reverse side of the weld and the welding area above 200 °C. The shape and penetration form of welding beads with different shielding gases are different. Firstly, the shape and penetration form of argon arc welding bead is adopted; secondly, the shape and penetration form of argon-helium mixed gas welding bead is used; the third is the shape and penetration form of helium welding bead. Melting form11.

Embodiment 2

[0031] The sealing welding method between titanium tube and titanium tube plate of the all-titanium condenser described in embodiment 1, the frontal protection of the weld seam: a single gas cylinder is used for the gas in the protective cover, which is not affected by the start and stop of welding according to a given The flow rate is continuous air supply; use a larger gas flow rate, and the gas flow rate in the protective cover is 4-6 liters per minute.

[0032] In the method of sealing welding between titanium tubes and titanium tube sheets of the all-titanium condenser, the protection of the back of the weld seam: first, the process of first expanding the tube and then welding is adopted, which can cut off the intrusion of air during welding and protect the back of the weld seam.

Embodiment 3

[0034] An all-titanium condenser titanium tube and titanium tube plate seal welding device, which consists of a protective cover 2 with an argon gas inlet 3, the protective cover 2 is connected to a titanium tube plate 4, and the titanium tube The plate 4 is connected to the titanium tube 5 , a spray gun 8 protrudes into the protective cover 2 , the spray gun 7 is connected to the hollow rod 6 , the spray gun 8 has a nozzle 1 , and the nozzle 1 is connected to the electrode 7 .

[0035] Example 3:

[0036] The titanium tube and titanium tube plate sealing welding method of the all-titanium condenser described in embodiment 1 or 2, the 1# machine of Shajiao Power Plant is a 200,000-kilowatt three-exhaust steam condenser unit, and the cooling pipe and the tube plate are all made of industrial pure Titanium, called all-titanium condenser. Its titanium is supplied by Kobe Steel, Japan.

[0037] The titanium tube plate uses the grade 3 titanium plate in the Japanese Industrial St...

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Abstract

The invention relates to a seal welding method of a titanium tube and a titanium tube plate of an all-titanium condenser. A turbine condenser requires higher air tightness, and the traditional copper alloy tube condenser can cause leakage for the corrosion and the destruction of a condensing tube and is an important reason for causing the unplanned outage of an electric power plant. The seal welding method of the titanium pipe and the titanium tube plate of an all-titanium condenser comprises the following steps of: selecting parameters according to the requirements of forming sizes, wherein the width of a welding channel is less than 3mm and does not exceed a half of the width of a hole bridge, and the size of the reinforcement of the welding channel corresponds to the inside raised size of the tube; and when welding titanium materials, a positive surface, a negative surface and a welding area above 200 DEG C are welded under argon protection. The invention is used for the seal welding of the titanium tube and the titanium tube plate of the all-titanium condenser.

Description

Technical field: [0001] The invention relates to a welding method in the field of welding, in particular to a sealing welding method of a titanium tube and a titanium tube plate of an all-titanium condenser. Background technique: [0002] Steam turbine condensers require high air tightness. In the past, copper alloy tube condensers often caused leakage due to corrosion and damage of condenser tubes, which was an important reason for unplanned shutdown of power plants. [0003] In addition, another cause of leakage is caused by slight leakage at the connection between the tube and the tube sheet. The thin-walled titanium tube is very thin, the wall thickness is only 0.5-0.7 mm, and the expandability is poor, so the connection strength of the expanded tube is low and the air tightness is poor. [0004] Large condensers are limited by transportation and other reasons. It is impossible to manufacture and assemble them in the factory and transport them to the site. They can only...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/095B23K9/235
Inventor 刘宏伟李媛支伟东
Owner 哈尔滨北方电力开发有限公司
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