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Methods of welding thermoplastic composites and doped resins used therein

A technology of composite material and welding method, applied in the field of welding method and doped resin used therein, can solve the problems of inability to realize the welding of CFRTP components, and achieve the effect of easy operation

Active Publication Date: 2018-06-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to provide a welding method for thermoplastic composite materials and the doped resin used in it to solve the above problems. Filling with the doped resin can realize laser welding of carbon fiber thermoplastic composite materials and solve the problem of laser penetration. The problem that penetration welding technology and laser direct connection technology cannot realize welding between CFRTP components

Method used

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  • Methods of welding thermoplastic composites and doped resins used therein
  • Methods of welding thermoplastic composites and doped resins used therein
  • Methods of welding thermoplastic composites and doped resins used therein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A welding method of thermoplastic composite material includes the following steps:

[0057] 1. Pre-treatment.

[0058] The welding surface of the doped resin and the carbon fiber thermoplastic composite member to be welded is cleaned with an organic solvent to remove stains.

[0059] 2. Material preparation.

[0060] The doped resin with a thickness of 0.2mm is placed between two carbon fiber thermoplastic composite materials to be welded, and the three are pressed together by the external force of a pneumatic device or a spring device.

[0061] The above-mentioned doping resin includes a matrix material and a doping material. The matrix material is a transparent thermoplastic resin (polyamide resin, PA), and the doping material is colored carbon black particles (8μm) that can absorb light energy and convert it into heat energy. , The volume percentage of the doping material in the doping resin is 0.05%.

[0062] 3. Welding.

[0063] Using a fiber laser with a wavelength of 1064nm...

Embodiment 2

[0067] A welding method of thermoplastic composite material includes the following steps:

[0068] 1. Pre-treatment.

[0069] The welding surface of the doped resin and the carbon fiber thermoplastic composite member to be welded is cleaned with an organic solvent to remove stains.

[0070] 2. Material preparation.

[0071] A doped resin with a thickness of 0.5mm is placed between two carbon fiber thermoplastic composite materials to be welded, and the three are pressed together by external force such as pneumatic devices or spring devices.

[0072] The above-mentioned doping resin includes a matrix material and a doping material. The matrix material is a transparent thermoplastic resin (polyethylene resin, PE), and the doping material is colored indium tin oxide particles (5 μm) that can absorb light energy and convert it into heat energy. ), the volume percentage of the doping material in the doping resin is 0.06%.

[0073] 3. Welding.

[0074] Using a fiber laser with a wavelength of ...

Embodiment 3

[0078] A welding method of thermoplastic composite material includes the following steps:

[0079] 1. Pre-treatment.

[0080] The welding surface of the doped resin and the carbon fiber thermoplastic composite material component to be welded is cleaned with an organic solvent to remove stains.

[0081] 2. Material preparation.

[0082] The doped resin with a thickness of 1mm is placed between two carbon fiber thermoplastic composite materials to be welded, and the three are pressed together by external force such as pneumatic devices or spring devices.

[0083] The above-mentioned doped resin includes a base material and a dopant material. The base material is a transparent thermoplastic resin (polymethylmethacrylate resin, PMMA), and the dopant material is a colored copper oxide that can absorb light energy and convert it into heat. Particles (10 μm), the volume percentage of the doping material in the doping resin is 0.08%.

[0084] 3. Welding.

[0085] Using a fiber laser with a wavel...

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Abstract

The invention relates to a welding method of carbon fiber thermoplastic composites and doped resin used in the welding method, and belongs to the technical field of composite connection and fixation. The doped resin is prepared from a matrix material and a doped material, wherein transparent thermoplastic resin serves as the matrix material, colored particles capable of absorbing light energy and converting the light energy into heat energy serve as the doped material, and the volume percent of the doped material in the doped resin ranges from 0.01% to 1%. The doped resin can serve as filling resin for welding of the carbon fiber thermoplastic composites. In the welding process, the space between the carbon fiber thermoplastic composites to be welded is filled with a layer of doped resin, the doped resin is subjected to laser radiation, a laser beam is transmitted in the doped resin and absorbed by the doped resin to form a heat source band, the doped resin for filling and matrix resin of the carbon fiber thermoplastic composites are heated and molten, the resin material in a molten state flows, disperses and solidifies under the action of external pressure, and thus welding can be achieved.

Description

Technical field [0001] The invention relates to the technical field of connection and fixation of composite materials, in particular to a welding method of thermoplastic composite materials and the doped resin used in the welding method. Background technique [0002] Carbon fiber thermoplastic composite material (CFRTP) has the characteristics of high specific strength, corrosion resistance, fatigue resistance, and good heat resistance. It has good application prospects in automobile lightweight, drone manufacturing, aerospace, national defense and military industry. [0003] However, due to the limitation of the forming mold, large and complex CFRTP components are generally connected by multiple parts, and the joint part is often the weakest part of the entire structure. The quality of the joint will directly determine the quality of the CFRTP component. Fatigue strength and service life. Realizing the high-quality connection of CFRTP material is the key to its engineering applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/00C08L23/06C08L33/12C08L25/06C08L69/00C08L27/06C08L59/00C08L21/00C08L71/12C08L81/06C08K3/04C08K3/22B29C65/16
CPCB29C65/16C08K3/04C08K3/22C08K2003/2231C08K2003/2248C08K2201/003C08K2201/014C08L2201/10C08L77/00C08L23/06C08L33/12C08L25/06C08L69/00
Inventor 焦俊科王强王飞亚昝少平张文武
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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