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

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

Example Embodiment

[0028] Example 1:

[0029] An all-titanium condenser titanium tube and titanium tube sheet sealing welding method. 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, followed by the excess height of the weld bead and the tube. The size of the inner protrusions is flush; when welding titanium materials, argon gas is used to protect the front side of the weld, the reverse side of the weld and the welding area above 200°C. The shapes and penetration forms of different shielding gas welds are different. First, the argon arc weld bead shape and penetration form 9; secondly, the argon-helium mixed gas weld bead shape and penetration form 10; Penetration Form 11.

Example Embodiment

[0030] Example 2:

[0031] The sealing welding method of titanium tube and titanium tube sheet of the all-titanium condenser described in Example 1, the front protection of the welding seam: a gas cylinder is used alone in the protective cover, and it is not affected by the start and stop of welding according to the given value. The flow is continuously supplied with air; using a larger gas flow, the gas flow in the protective cover is 4-6 liters per minute.

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

Example Embodiment

[0033] Example 3:

[0034] An all-titanium condenser titanium tube and titanium tube sheet sealing welding device, which consists of a protective cover 2 with an argon gas inlet 3, the protective cover 2 is connected to the titanium tube sheet 4, the titanium tube The plate 4 is connected to the titanium tube 5 , a spray gun 8 is inserted 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 all-titanium condenser titanium tube and titanium tube sheet sealing welding method described in embodiment 1 or 2, Shajiao Power Plant 1# machine is a 200,000-kilowatt three-exhaust steam condenser unit, and the materials of cooling pipe and tube sheet are industrial pure Titanium, called all-titanium condenser. Its titanium material is supplied by Kobe Steel.

[0037] The titanium tube sheet uses the grade 3 titanium sheet in the Japanese indu...

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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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