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A device and method of using coaxial spray cooling coupling auxiliary fsw

A technology of coaxial spraying and cooling liquid, which is applied in the fields of mechanical control technology and material engineering, can solve problems such as inability to fit welded joints tightly, hydrogenation of welded joints, and low cooling effect, so as to achieve effective welding quality control and avoid cold cracks , the effect of convenient operation

Active Publication Date: 2022-08-02
NANJING TECH UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a coaxial spray cooling coupling auxiliary FSW device and use method, realize precise cooling and quality control of friction stir welded parts, and solve "wet" cooling The resulting hydrogenation of welded joints, material corrosion and other problems, and at the same time solve the problem that the "dry" cooling cannot be closely attached to the welded joints, and the cooling effect is relatively low

Method used

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  • A device and method of using coaxial spray cooling coupling auxiliary fsw
  • A device and method of using coaxial spray cooling coupling auxiliary fsw
  • A device and method of using coaxial spray cooling coupling auxiliary fsw

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Effect test

Embodiment 1

[0035] Use fluid software to simulate the cooling effect of FSW welded joints under different jet flow rates when water is used as the cooling medium, and extract the temperature curve at the welded joints, such as image 3 As can be seen from the figure, when the jet flow rate of water is 0.01kg / s and 0.001kg / s, the flow rate is small, and when the water touches the surface of the test plate, it all evaporates, but due to the heat production rate of the stirring head It is much higher than the heat dissipation rate of the spray, so the cooling effect of the welded joint is poor. When the spray flow rate is increased to 0.1kg / s, the spray has a certain cooling effect on the welded joint.

Embodiment 2

[0037] Fluent fluid software was used to simulate the cooling effect of FSW welded joints under different jet flow rates when liquid nitrogen was used as the cooling medium, and the temperature curves at the welded joints were extracted, such as Figure 4 It can be seen from the figure that the size of the spray flow has a great influence on the effect of spray cooling. When the spray flow of liquid nitrogen is 0.001kg / s, its cooling effect on the welded joint is not obvious. When the mass flow rate increases, the cooling effect is more obvious. When the injection flow rate of liquid nitrogen is 0.01kg / s, liquid nitrogen cooling can rapidly cool the high temperature area of ​​the welded joint, but when the mass flow rate is higher, the welded joint will be instantly cooled. At room temperature, this situation is likely to lead to the generation of cold cracks. Combined with the actual situation and simulation results, it is more appropriate to select the spray flow rate of 0.01...

Embodiment 3

[0039] Combined with the simulation results, the experiment was carried out with a jet flow rate of 0.01kg / s. Since the temperature of the welded joint could not be directly measured in the experiment, K-type thermocouples were used to measure the distance from the center of the welded joint to the forward and backward sides of 25mm, 30mm and 35mm respectively. The temperature is measured at six points. The temperature curve of the conventional FSW monitoring point is as follows: Figure 5 As shown, the temperature curve of the liquid nitrogen cooling assisted FSW is as follows Image 6 As can be seen from the figure, the use of liquid nitrogen to cool the welded joint can effectively reduce the peak temperature and increase the post-weld cooling rate.

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Abstract

The invention discloses a device and a method of using a coaxial spray cooling coupling auxiliary FSW, comprising friction stir welding equipment, an atomizing nozzle, a surrounding coil, a thermometer, a cooling liquid inlet pipe and a test plate. The outer side of the main shaft of the welding machine is connected to the outer shell of the friction stir welding equipment, so that the surrounding coil and the stirring shaft move synchronously. The invention sprays the cooling liquid through the atomizing nozzle, quickly takes away the heat generated in the welding process, effectively reduces the peak temperature of the welded joint, increases the cooling rate after welding, and the crystal grains do not have sufficient energy to grow up, which inhibits the growth of the crystal grains. Small and uniform grains are obtained in the joint, which reduces or eliminates the residual stress and deformation of the welded joint and improves the mechanical properties of the joint.

Description

technical field [0001] The invention relates to a coaxial spray cooling coupling auxiliary FSW device and a use method, which can be used for precise cooling and quality control of friction stir welding parts, and belong to the fields of mechanical control technology and material engineering. Background technique [0002] Friction stir welding (Friction Stir Welding, FSW) is a new type of solid phase joining technology, which has the advantages of small welding deformation, high welding quality, green environmental protection, etc. However, due to the high heat input, the cooling rate of the welded joint decreases, resulting in a wider heat-affected zone, which seriously deteriorates the mechanical properties of the welded joint and affects the reliability of the welded joint. [0003] At present, some researchers change the welding thermal cycle and temperature field distribution by adding cooling conditions, so as to achieve the effect of improving the formation of frictio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/122B23K20/26
Inventor 王健周进鹏马杰陆晓峰
Owner NANJING TECH UNIV
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