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Method for improving interface connection strength of dissimilar resin or dissimilar resin-based composite material welding joint

A technology for composite materials and welded joints, which is applied in the field of welding, can solve the problems of lack of resin in resin-based composite material joints, inability to form effective mechanical connections, weak diffusion connections at the interface, etc., to achieve joint forming and performance, and good practical application prospects , easy-to-obtain effect

Pending Publication Date: 2022-03-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is that the connection interface of the welded joint is relatively flat, there is almost no mechanical interlocking structure, and an effective mechanical connection cannot be formed. Therefore, the connection of the joint mainly depends on the mutual diffusion and entanglement between the molecular chains at the interface, but most dissimilar resins The compatibility is not high, resulting in weak diffusion connection at the interface, and the joint strength is not high
The second is the difference in melting point between dissimilar resins. At the initial stage of welding, the heating element at the interface heats the two materials at the same time, and the dissimilar resin or resin-based composite material with the lower melting point will melt first, and under the welding pressure along the Bleeding at the edge of the joint, resulting in large deformation of the resin joint or loss of resin in the resin-based composite joint

Method used

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  • Method for improving interface connection strength of dissimilar resin or dissimilar resin-based composite material welding joint
  • Method for improving interface connection strength of dissimilar resin or dissimilar resin-based composite material welding joint
  • Method for improving interface connection strength of dissimilar resin or dissimilar resin-based composite material welding joint

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Effect test

Embodiment 1

[0045] A method for improving the interfacial connection strength of a welded joint of heterogeneous resins or heterogeneous resin-based composite materials in this embodiment is specifically carried out in accordance with the following steps:

[0046] (1) The welding materials are dissimilar resins, which are PPS with a melting point of 295°C and PEEK with a melting point of 334°C. The size of the two resins is 120mm×30mm×3mm, and the overlapping area is 30mm×30mm.

[0047] (2) The composite film layer is composed of PEEK and PPS films with a size of 0.2mm×2mm×30mm, of which 7 PPS films and 8 PEEK films are arranged alternately to form a composite film with an area of ​​30mm×30mm, and The outermost of the composite membrane is PEEK membrane.

[0048] (3) Select the heating element, the heating element used is 200 mesh stainless steel wire mesh.

[0049] (4) Before welding, use absolute ethanol to wipe the test plate and composite film to be welded to remove surface impuritie...

Embodiment 2

[0055] A method for improving the interfacial connection strength of a welded joint of heterogeneous resins or heterogeneous resin-based composite materials in this embodiment is specifically carried out in accordance with the following steps:

[0056] (1) The welding materials are continuous carbon fiber reinforced PEEK composite material (Cf / PEEK) and continuous carbon fiber reinforced PPS composite material (Cf / PPS), with fiber mass fractions of 45% and 52%, respectively. The dimensions of both composites are 120mm×30mm×1.8mm, and the overlapping area is 30mm×30mm.

[0057] (2) The composite film layer is composed of PEEK and PPS films with a size of 0.15mm×2mm×30mm, of which 7 PPS films and 8 PEEK films are arranged alternately to form a composite film with an area of ​​30mm×30mm, and The outermost of the composite membrane is PEEK membrane.

[0058] (3) The heating element is selected, and the heating element used is a 250-mesh stainless steel wire mesh.

[0059] (4) Be...

Embodiment 3

[0063] A method for improving the interfacial connection strength of a welded joint of heterogeneous resins or heterogeneous resin-based composite materials in this embodiment is specifically carried out in accordance with the following steps:

[0064] (1)-(4): The implementation steps are the same as in the implementation case 1, and get image 3 Joints with composite membranes in Figure 7 Induction welding equipment shown in the welding.

[0065] (5) Place the joint with the composite film layer on the backing plate 1, place the pressure plate 2 on the joint, and then apply a pressure of 1.2MPa on the pressure device 3, turn on the power supply 5, the welding power is 1.8kW, and the induction coil 4 is energized to launch Electromagnetic field, the welding time is 120s.

[0066] (6) After the welding time is reached, cut off the power supply, keep the original welding pressure and cool down to room temperature, and the welding is completed.

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Abstract

The invention discloses a method for improving the interface connection strength of a dissimilar resin or dissimilar resin-based composite material welding joint, relates to the field of welding, and aims to improve mechanical interlocking connection in the dissimilar resin or dissimilar resin-based composite material welding joint, reduce melting and outflow of low-melting-point resin and achieve the effect of improving the quality of the joint. According to the method, a welding material and a heating element are selected, two kinds of welded resin or resin of two kinds of welded resin-based composite materials are used for manufacturing a composite film layer, a test piece is clamped, and welding is carried out. According to the method, a mechanical interlocking structure can be constructed on the joint interface, diffusion bonding of the joint interface of resin difficult to be compatible is improved, excessive melting and flowing out of low-melting-point resin or low-melting-point resin matrix resin in a resin-based composite material in the welding process are inhibited, joint forming and performance are improved, and the method has good practical application prospects. The method is applied to the field of dissimilar resin welding.

Description

technical field [0001] The invention relates to the field of welding, in particular to a method for improving the interfacial connection strength of welded joints of heterogeneous resins or heterogeneous resin-based composite materials. Background technique [0002] Special engineering resins have the characteristics of insulation, corrosion resistance, and high weather resistance. The fiber-reinforced resin base is composed of special resins such as polyphenylene sulfide (PPS) and polyether ether ketone (PEEK) as the matrix and glass fiber or carbon fiber as the reinforcing fiber. Composite materials have extremely high specific strength, so resin and fiber-reinforced resin-based composite materials have important applications in the aerospace field. Thermoplastic resins such as PPS and PEEK can be melted after being heated, and can still maintain their original physical and chemical properties after cooling and solidification, so they have weldability. At present, welding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C65/02B29C65/36
CPCB29C65/02B29C65/36B29C66/80
Inventor 许志武马钟玮李政玮陈姝闫久春
Owner HARBIN INST OF TECH
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