CN-119773246-B - Welding method for resin matrix composite material for realizing reinforced fiber connection

CN119773246BCN 119773246 BCN119773246 BCN 119773246BCN-119773246-B

Abstract

The invention discloses a welding method of a resin matrix composite material for realizing reinforcement fiber connection, and relates to the field of welding methods of resin matrix composite materials. The invention aims to solve the technical problem that the joint strength of the resin matrix composite obtained by the traditional ultrasonic welding is low. The method comprises the steps of firstly, selecting a joint form and processing a composite material, secondly, heating a to-be-welded area, removing a resin matrix of the to-be-welded area to expose reinforcing fibers, thirdly, welding the reinforcing fibers by using a horizontal vibration ultrasonic welding method to enable the reinforcing fibers to be connected, and fourthly, pouring resin again in the welding area after the fibers are connected. The invention not only realizes the connection of the resin matrix, but also realizes the connection of the carbon fiber in the resin matrix, and the obtained joint has high strength, and the method can realize the welding of various composite materials, such as carbon fiber/glass fiber and other resin-based composite materials. The welding method is used for welding the resin matrix composite material connected by the reinforced fibers.

Inventors

XU YANG
FU QIANGANG
FAN XIAOLI

Assignees

西北工业大学

Dates

Publication Date: 20260505
Application Date: 20250211

Claims (7)

1. The welding method for the resin matrix composite material for realizing the connection of the reinforcing fibers is characterized by comprising the following steps of: 1. pre-clamping a joint to be welded of the resin matrix composite material, heating a zone to be welded, removing a resin matrix of the zone to be welded, and exposing part of reinforcing fibers; 2. Welding the exposed reinforcing fibers of the to-be-welded joint treated in the first step by adopting a horizontal vibration ultrasonic welding method, wherein the reinforcing fibers of the to-be-welded joint are connected together; 3. pouring resin again from the reinforced fibers connected in the step two, filling in a vibration auxiliary mode while pouring, and applying pressure for forming after pouring to finish the process; The welding process parameters comprise that the power of ultrasonic waves is 100-3000W, the pressure maintaining time before the ultrasonic waves is 0.1-100 s, the ultrasonic time is 0.01-100 s, the pressure of an ultrasonic head is 0.01-2 MPa, the frequency of the ultrasonic waves is 15 kHz-60 kHz, and the amplitude of the ultrasonic waves is 1-100 mu m; The third step of controlling vibration parameters, wherein the power is 10-3000W, the vibration time is 10-100 s, the vibration frequency is 15 Hz-60 kHz, and the amplitude is 1 mu m-1 mm; and step three, the applied pressure is 0.01-5 MPa.
2. The method for welding a resin-based composite material for reinforcing fiber attachment according to claim 1, wherein in the step one, the resin-based composite material is carbon fiber/glass fiber reinforced polyphenylene sulfide or carbon fiber/glass fiber reinforced polyetheretherketone.
3. The welding method for resin matrix composites for reinforcement fiber attachment according to claim 1, wherein the pre-clamping step is a step of lapping the resin matrix composites with a lapping width of 10mm.
4. The welding method for the resin matrix composite material for realizing the connection of the reinforcing fibers according to claim 1, wherein the heating temperature in the step one is 20-50 ℃ higher than the melting temperature of the resin matrix in the resin matrix composite material.
5. The welding method of resin matrix composite materials for reinforcement fiber connection according to claim 1, wherein step one uses tweezers or a cutter to remove the resin matrix melted by heating.
6. The welding method for the resin matrix composite material for realizing the connection of the reinforcing fibers according to claim 1, wherein the step two is to stagger and lap the reinforcing fibers exposed from the joint to be welded.
7. A method of welding a resin-based composite material for reinforcement fiber attachment according to claim 1, wherein step three removes the ultrasonic head and then re-casts resin to the weld area.

Description

Welding method for resin matrix composite material for realizing reinforced fiber connection Technical Field The invention relates to the field of welding methods of resin matrix composite materials. Background Resin-based composite materials are widely used in the fields of aerospace, advanced manufacturing and the like due to the advantages of low density, high strength and the like. Similar to other materials, resin-based composite materials are also difficult to achieve complex build one-shot molding during application. Therefore, in the practical application process, a welding or bonding method is often required to prepare a simple piece of the resin matrix composite material into a complex component so as to be convenient for practical application. The welding method of the resin matrix composite material is various, such as induction welding, ultrasonic welding, resistance welding and the like. At present, the welding method of the resin matrix composite material with wider application is ultrasonic welding, and has the advantages of high welding efficiency, low welding cost, simple operation and the like. However, in the conventional ultrasonic welding process, whether or not the energy directors are used, the welding process only achieves the connection between the resins, and does not achieve the effective connection of the internal fibers such as carbon fibers or glass fibers. The joint strength of resin-based composites obtained by conventional ultrasonic welding is generally low. Disclosure of Invention The invention provides a welding method for a resin-based composite material for realizing reinforced fiber connection, which aims to solve the technical problem that the joint strength of the resin-based composite material obtained by the traditional ultrasonic welding is low. The welding method for the resin matrix composite material for realizing the connection of the reinforcing fibers comprises the following steps: 1. pre-clamping a joint to be welded of the resin matrix composite material, heating a zone to be welded, removing a resin matrix of the zone to be welded, and exposing part of reinforcing fibers; 2. Welding the exposed reinforcing fibers of the to-be-welded joint treated in the first step by adopting a horizontal vibration ultrasonic welding method, wherein the reinforcing fibers of the to-be-welded joint are connected together; 3. and (3) pouring the resin again with the reinforced fibers connected in the step two, and performing vibration assisted filling during pouring, and then performing pressure forming after pouring to finish the process. Further, in the step one, the resin-based composite material is carbon fiber/glass fiber reinforced polyphenylene sulfide or carbon fiber/glass fiber reinforced polyether-ether-ketone. Further, in the first step, the heating temperature is 20-50 ℃ higher than the melting temperature of the resin matrix in the resin matrix composite material. Further, the welding process parameters in the second step are that the power of ultrasonic waves is 100-3000W, the pressure maintaining time before ultrasonic waves is 0.1 s-100 s, the ultrasonic time is 0.01 s-100 s, the pressure of an ultrasonic head is 0.01 MPa-2 MPa, the frequency of ultrasonic waves is 15 kHz-60 kHz, and the amplitude of ultrasonic waves is 1 mu m-100 mu m. Further, the vibration parameters of the third step are that the power is 10-3000W, the vibration time is 10 s-100 s, the vibration frequency is 15 Hz-60 kHz, and the vibration amplitude is 1 mu m-1 mm. Further, the pressure applied in the third step is 0.01-5 MPa. The high-strength welding of the fiber reinforced resin matrix composite is realized by the methods of resin removal, ultrasonic welding of reinforced fibers and resin casting. The method comprises the steps of firstly, selecting a joint form and processing a composite material, secondly, heating a to-be-welded area, removing a resin matrix of the to-be-welded area to expose reinforcing fibers, thirdly, welding the reinforcing fibers by using a horizontal vibration ultrasonic welding method to enable the reinforcing fibers to be connected, fourthly, pouring resin again in the welding area after the fibers are connected, and finally, completing welding by using vibration matched with pressurization to enable the resin to be well filled among the fibers. The invention has the beneficial effects that: In order to obtain the high-strength resin-based composite material joint and promote the wide application of the joint in the current manufacturing industry, the invention provides a novel multi-step welding method of the resin-based composite material. The method can realize the connection of the reinforcing fibers in the resin matrix composite material and effectively improve the joint strength of the resin matrix composite material. In the welding process, firstly, resin at a position to be welded is removed, reinforcing fibers are exposed, and then, a horizontal ul