Three-step approach four-interface system-based heterogeneous material joint structure and heterogeneous material connection method

A technology of heterogeneous materials and connection methods, applied in the direction of welding/welding/cutting items, welding equipment, welding equipment, etc., can solve problems such as difficult fusion, difficult thermal conductivity, uniform heating, and inability to withstand dynamic loads, etc., to achieve Effects of eliminating performance deterioration of welded joints, improving performance of welded joints, and increasing joint strength

Active Publication Date: 2017-04-19
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Fusion welding can be used to connect two materials with similar melting points. For two materials with large melting point differences, they cannot be molten or molten at the same time, especially carbon materials and ceramic materials with high melting points. The melting point even exceeds The boiling point of some non-ferrous metals makes it difficult to fuse the two, the difference in thermal conductivity makes it difficult for the two to heat evenly, and the difference in linear expansion coefficient causes residual thermal stress on the side of the welded joint during the welding process, causing serious deformation of the joint, and This kind of deformation cannot be eliminated by heat treatment, which affects the performance of the joint; some ceramics and carbon materials can use the direct metal brazing process below the melting point of the two materials, and the brazing material composition is reasonably selected to control the interfacial bonding process to obtain Dissimilar metal joints with good mechanical properties; using riveting structure can almost realize the solid phase connection of the above materials, but this method has great requirements on the size of the workpiece and cannot solve the structural deformation caused by different elastic modulus; use Adhesives can also realize the connection of metal materials and non-metallic materials, but the adhesive materials limit the use of workpieces and cannot bear dynamic loads

Method used

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  • Three-step approach four-interface system-based heterogeneous material joint structure and heterogeneous material connection method
  • Three-step approach four-interface system-based heterogeneous material joint structure and heterogeneous material connection method
  • Three-step approach four-interface system-based heterogeneous material joint structure and heterogeneous material connection method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: Cold spraying-brazing composite connection method of aluminum alloy 6063 / 316L stainless steel

[0031] The thickness of the aluminum alloy 6063 and 316L stainless steel plate is 4 mm, and the aluminum-silicon alloy powder with a particle size of 10-50 μm is selected as the spraying material. The surfaces of the aluminum alloy 6063 and 316L stainless steel plates to be welded were sandblasted and fixed on the fixture, and a 200 μm aluminum-silicon alloy coating was deposited on the surfaces to be welded of the two base metals by cold spraying, with a coating area of ​​4 ×4cm. The cold spray gun adopts laval nozzle, and the spraying parameters are: spraying distance 20mm, spray gun moving speed 40mm / s, main gas pressure 3.8MPa, gas temperature 300°C. Then use the furnace to braze the assembly, use Al12Si wire, diameter 1.5mm, brazing temperature 610 ℃, holding time 5min, and cool with the furnace.

Embodiment 2

[0032] Example 2: 316L stainless steel pipe / carbon fiber composite pipe cold spraying-laser welding composite connection method

[0033] 316L stainless steel pipe and carbon fiber composite pipe have an inner diameter of 8mm and an outer diameter of 12mm. Copper powder with a particle size of 10-50μm is used as the spraying material. The butt surface of the carbon fiber composite pipe and the stainless steel pipe was sandblasted and fixed on the fixture, and a 2mm copper coating was deposited on the surface to be welded by cold spraying. The cold spray gun adopts laval nozzle, and the spraying parameters are: spraying distance 20mm, spray gun moving speed 60mm / s, main gas pressure 4.0MPa, gas temperature 500°C. Then the 5kW laser welding method is used to join the two materials at one time.

Embodiment 3

[0034] Embodiment 3: Titanium alloy TC4 and carbon fiber plate spraying-brazing composite connection method

[0035] The length and width of the titanium alloy plate are 1000mm and 200mm respectively, and the length and width of the carbon fiber composite plate are 3000mm and 200mm. Pure titanium powder with a particle size of 10-45 μm is selected as the spraying material. The carbon fiber plate and the titanium alloy plate need to be sandblasted on the joint surface and fixed on the fixture. The cold spray method is used to deposit a 200-300 μm pure titanium layer. The coating area is the area of ​​the lap joint. The cold spray gun adopts laval nozzle, and the spraying parameters are: spraying distance 20mm, spray gun moving speed 40mm / s, main gas pressure 5.0MPa, gas temperature 600°C. Grind the coating so that the upper and lower surfaces make the gap between the contact surfaces less than 0.5mm, and the misalignment less than 0.2mm. The assembly is then furnace brazed. ...

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Abstract

The invention discloses a three-step approach four-interface system-based heterogeneous material joint structure and heterogeneous material connection method. The method includes the following steps that: 1) the connecting surfaces of a base material A and a base material B are pre-treated; 2) cold spraying is performed on the connecting surface of the base material A, so that a coating C can be formed, cold spraying is performed on the connecting surface of the base material B, so that a coating layer D can be formed; and 3) the coating C and the coating D are welded through a butt-joint or lap-joint manner, so that a welding seam E is formed, welding parameters are controlled in a welding process, so that the interfaces of the base materials A, B and the cold-sprayed coatings C, D will not be melt or locally melt. According to the three-step approach four-interface system-based heterogeneous material joint structure and heterogeneous material connection method of the present invention, the connection of two heterogeneous materials which have little possibility of being connected is converted into the connection of materials which have high possibility of being connected through coating technologies; and the thermal input of the interfaces is reasonably controlled, so that various limitations caused by huge thermal performance difference of heterogeneous materials in conventional connection methods can be eliminated, and the connection performance of the joint can be improved. A novel method is provided for the connection of the heterogeneous materials.

Description

technical field [0001] The invention belongs to the field of material processing and relates to a connection structure and method of two heterogeneous materials. Background technique [0002] Non-ferrous metals have the characteristics of light weight, high specific strength, good thermal conductivity, high specific strength electrical conductivity, corrosion resistance and reliable performance, and have become one of the most widely used light metal materials. The heterogeneous composite structure of ferrous metal and non-ferrous metal can give full play to the inherent advantages of the two materials. It has special physical properties, light weight, high strength and good corrosion resistance. It is more and more widely used in automobile manufacturing, aerospace and other fields. more and more widely. Non-metallic materials such as carbon materials and silicates also have very special physical properties and play an irreplaceable role in specific fields. However, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K37/00B23K103/18
CPCB23K31/02B23K37/00B23K2103/18
Inventor 李成新刘森辉付斯林谭香张山林雒晓涛杨冠军李长久
Owner XI AN JIAOTONG UNIV
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