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Method for improving connection strength of thermoplastic composite and metal

A composite material and metal connection technology, applied in the field of welding, can solve the problems of small heat-affected zone, insufficient connection, high cost of implanted materials, etc., and achieve the effect of increasing the contact area and improving the connection strength

Inactive Publication Date: 2018-07-20
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the resistance implantation welding process is simple, the equipment is flexible, and no surface treatment is required, but during the welding process, the welding head will introduce impurities, thereby reducing the fatigue performance of the welding head and the uniformity of electrical properties; electromagnetic induction welding can be carried out continuously Welding, however, has problems such as high cost of implanted materials, filler materials affecting welding strength, and difficulty in welding structures with complex welding surfaces; ultrasonic welding has the advantages of high welding efficiency and high joint strength, but it has difficulties in making energy directors and Limitation of small weldable area at one time
[0004] Laser welding has the advantages of simple process, low cost, fast heating speed, strong penetration ability, small heat-affected zone, high joint strength, uniform composition, etc., and can complete one-time large-area welding, but compared with other methods, it faces A key problem: low connection strength
There are two main reasons for the low strength of fiber-reinforced thermoplastic composites and metal laser connections: one is that the resin content of fiber-reinforced thermoplastic composites is low, resulting in less resin for fusion bonding fiber-reinforced thermoplastic composites and metals. Insufficient; the other is that the metal surface is smooth, so that the contact area between the fiber-reinforced thermoplastic composite and the metal is small, and the occlusal structure cannot be formed

Method used

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  • Method for improving connection strength of thermoplastic composite and metal
  • Method for improving connection strength of thermoplastic composite and metal
  • Method for improving connection strength of thermoplastic composite and metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, follow the steps below to laser weld thermoplastic composites to metals:

[0033] 1. Using a nanosecond laser (wavelength 532nm, pulse width 20ns, power 30W, frequency 5KHz) and a scanning galvanometer (scanning speed 5m / s) to micro-texture the surface of aluminum alloy (7075), the micro-texture is a grid shape structure, the scanning line spacing is d=0.1mm; the scanning electron microscope image of the prepared microtexture is as follows figure 2 As shown, the text in the figure has no other meaning except for the necessary information such as magnification and length; it can be seen that regular dimples and protrusions are formed on the surface of the aluminum alloy, which increases the contact between the aluminum alloy and the thermoplastic composite material during connection. area, improve connection strength;

[0034] 2. Lay polyamide resin with a thickness of 25 μm on the microstructure, which is just large enough to completely cov...

Embodiment 2

[0039] Follow the steps below to laser weld thermoplastic composites to metals:

[0040] 1. Using a picosecond laser (wavelength 1064nm, pulse width 40ps, power 20W, frequency 30MHz) and a scanning galvanometer (scanning speed 8m / s) to process the microtexture of the stainless steel surface, the microtexture is an inverted cone structure;

[0041] 2. Lay polymethyl methacrylate resin with a thickness of 100 μm on the micro texture, which is just large enough to completely cover the micro texture of the stainless steel surface;

[0042] 3. Place the glass fiber-reinforced polymethyl methacrylate on the stainless steel, with the microstructure and polymethyl methacrylate resin layer between the two, clamp the combined workpiece together by pneumatic tooling, and apply 0.5 The pressure of MPa makes the polymethyl methacrylate composite material and stainless steel stick together;

[0043] 4. Use a 532nm green laser (power 100W) to focus on the stainless steel surface, and scan (...

Embodiment 3

[0046] Follow the steps below to laser weld thermoplastic composites to metals:

[0047] 1. Using a femtosecond laser (pulse width 200fs, power 5W, frequency 100MHz) and a scanning galvanometer (scanning speed 10m / s) to process the microtexture of the titanium alloy surface, the microtexture is a slightly convex structure;

[0048] 2. Lay polyphenylene sulfide resin with a thickness of 50 μm on the microstructure, which is just large enough to completely cover the microstructure on the surface of the titanium alloy;

[0049] 3. Place the aramid fiber-reinforced polyphenylene sulfide on the titanium alloy, with the microstructure and polyphenylene sulfide resin layer in between, clamp the combined workpiece together by pneumatic tooling, and apply 0.4MPa Pressure, so that the polyphenylene sulfide composite material and the titanium alloy are bonded together;

[0050] 4. Use a 266nm ultraviolet laser (power 40W) to focus on the surface of the titanium alloy, and scan the surface...

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Abstract

The invention belongs to the technical field of welding and discloses a method for improving connection strength of a thermoplastic composite and metal. The method comprises the following steps that S1, a micro texture is prepared in a to-be-connected area of the surface of the metal through a short-pulse laser; S2, a layer of thermoplastic resin material is laid on the surface of the micro texture; and S3, heat conduction connection is conducted on the thermoplastic composite and the metal through a laser. According to the method, on the one hand, the micro texture is prepared in the to-be-connected area of the surface of the metal, the contact area of the thermoplastic composite and the metal is increased, and an occlusion structure is formed; on the other hand, the layer of thermoplastic resin material is added between the thermoplastic composite and the metal, the thermoplastic resin material is in a molten state during laser welding, thus the thermoplastic resin material and the metal are fully connected, and finally the connection strength of the thermoplastic composite and the metal is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for improving the connection strength between a thermoplastic composite material and a metal. Background technique [0002] Thermoplastic composite materials have significant advantages such as high specific strength and specific modulus, excellent impact resistance, fatigue resistance, water resistance and fatigue resistance, repeatable processing, high molding processing efficiency, and low molding processing cost. Therefore, thermoplastic composite materials have broad application prospects in aerospace, wind power generation, transportation and other fields. The application of thermoplastic composite materials will inevitably produce connection problems with traditional metal materials such as steel and aluminum alloys. The welding of thermoplastic composite materials does not use adhesives, only the resin on the surface of the composite material is mel...

Claims

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Application Information

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IPC IPC(8): B29C65/16
CPCB29C65/1612B29C66/022B29C66/742B29C66/7422B29C66/74283B29C65/1606B29C65/1609B29C65/1616B29C65/1629B29C65/1654B29C65/44B29C65/8215B29C65/8253B29C66/0246B29C66/1122B29C66/30322B29C66/43B29C66/71B29C66/721B29C66/7212B29C66/7352B29C66/7392B29C66/7428B29C66/8242B29C66/929B29C66/939B29K2077/00B29K2023/06B29K2081/04B29K2033/12B29K2309/08B29K2307/04B29K2277/10
Inventor 盛立远
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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