Solid-phase diffusion bonding method for integrated expanded jointing and welding of tube sheet structure

A diffusion connection and tube-sheet technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as complex production process, high-temperature joint relaxation, crevice corrosion, etc., achieve simple process, enhanced joint sealing, avoid crack effect

Active Publication Date: 2016-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a tube sheet for solving the problems of high temperature joint relaxation, gap corrosion, complex production process and high cost when the connection between the he

Method used

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  • Solid-phase diffusion bonding method for integrated expanded jointing and welding of tube sheet structure
  • Solid-phase diffusion bonding method for integrated expanded jointing and welding of tube sheet structure
  • Solid-phase diffusion bonding method for integrated expanded jointing and welding of tube sheet structure

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specific Embodiment approach 1

[0021] Specific implementation mode one: combine Figure 1 to Figure 5 Describe this implementation mode, this implementation mode is realized through the following steps:

[0022] Step 1. Cleaning before welding: first remove the oxide film on the surface of the material of the tube 1 and tube sheet 2 to be welded by mechanical grinding, and then use an organic solvent or cleaning agent to wipe the surface of the tube 1 and tube sheet 2 to remove oil and metal dust;

[0023] Step 2, clamping of tube 1 and tube plate 2: when clamping, the gap between the outer wall of tube 1 and the inner hole of tube plate 2 is e, and the length of the upper end of tube 1 protruding from the upper end surface of tube plate 2 is k, see figure 1 ;

[0024] Step 3. Friction welding: the high-speed rotating friction head 3 is inserted into the inner hole of the pipe 1 at a certain pressing speed, so that the pipe 1 is rubbed between the friction head 3 and the pipe 1 to generate heat, and the h...

specific Embodiment approach 2

[0025] Specific implementation mode two: combination figure 1 To illustrate this embodiment, in this embodiment, the organic solvent in step 1 is alcohol or acetone. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Specific implementation mode three: combination figure 1 Describe this embodiment. In this embodiment, in step 2, the gap e between the outer wall of the tube 1 and the inner hole of the tube sheet 2 is 0.05 mm to 0.25 mm. Select the value of the gap e according to the selected material and performance. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a solid-phase diffusion bonding method for integrated expanded jointing and welding of a tube sheet structure, and aims to solve the problems that a high-temperature joint loosens and crevice corrosion occurs when a tube and a tube plate of a heat exchanger are connected according to an expanded jointing method, a fusion welding method as well as a method integrating the expanded jointing method and the fusion welding method. The solid-phase diffusion bonding method comprises the following steps; (1) surface oxidation films on materials in to-be-welded areas of the tube and the tube plate are removed by polishing at first, and then the surfaces of the tube and the tube plate are scrubbed by adopting an organic solvent or a cleaning agent; (2) when the tube and the tube plate are clamped together, the interval between the outer wall of the tube and an inner hole in the tube plate is e, and the length of the upper end, extending out of the upper end surface of the tube plate, of the tube is k; (3) a high-speed rotating friction head is inserted into an inner hole in the tube at a certain press-in speed, so that the tube is subjected to friction between the friction head and the tube plate, heat is generated due to the friction, and then the tube gradually reaches a thermoplastic state when being deformed to generate heat; when a shaft shoulder of the friction head is pressed in the upper surface of the tube plate at a depth of t, the friction head keeps rotating at a high speed and remains for 5 seconds, and then is lifted at a constant speed, so as to realize atomic diffusion between the tube plate and the tube as well as metallurgical bonding. The solid-phase diffusion bonding method is applicable to tube plate welding.

Description

technical field [0001] The invention relates to a friction welding method, in particular to a solid phase diffusion connection method which utilizes friction heat as a heat source to realize the integration of expansion and welding of tube and plate structures. Background technique [0002] The tube sheet structure is the most widely used form of heat exchanger at present. After connecting the heat exchange tube and the tube sheet, it can be used as a device to realize the function of heat exchange. Heat exchangers occupy an important position in many industrial productions such as chemical industry, petroleum, and food, and are widely used. The tube-sheet structure is a common combination structure in heat exchangers. It is often connected by expansion joints, welding and expansion welding. Due to the long-term axial load generated by the pressure difference on the tube joints, the tube joints have been repeatedly cooled. , heating, high pressure and medium corrosion fatig...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/122B23K20/24
Inventor 黄永宪吕宗亮万龙黄体方吕世雄冯吉才
Owner HARBIN INST OF TECH
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