CN116222813A - Temperature monitoring method for welding joint of continuous carbon fiber reinforced thermoplastic composite material - Google Patents
Temperature monitoring method for welding joint of continuous carbon fiber reinforced thermoplastic composite material Download PDFInfo
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- CN116222813A CN116222813A CN202310078399.4A CN202310078399A CN116222813A CN 116222813 A CN116222813 A CN 116222813A CN 202310078399 A CN202310078399 A CN 202310078399A CN 116222813 A CN116222813 A CN 116222813A
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Abstract
The invention discloses a temperature monitoring method of a welding joint of a continuous carbon fiber reinforced thermoplastic composite material, which comprises the steps of carrying out surface treatment on an upper joint pair and a lower joint pair which are subjected to ultrasonic direct welding, fixing electrodes, and placing the electrodes in a temperature control box; and the signal processing end is used for collecting and analyzing signals obtained by the electrode, and comparing the signals with a temperature-resistance curve obtained by experiments to realize temperature monitoring of the welding joint. The invention monitors the internal temperature of the welding joint by utilizing the property of the material on the premise of no additional structure, lower cost, convenient operation and stability and reliability.
Description
Technical Field
The invention belongs to the technical field of temperature monitoring, and particularly relates to a method for monitoring the temperature of a welding joint of a continuous carbon fiber reinforced thermoplastic composite material.
Background
In the practical application process, the strength of the joint connected by welding is weaker than that of the material, and damage is firstly concentrated at the joint part when bearing a large load. Because the material itself has thermoplasticity, temperature monitoring in the service process has great influence on the structural reliability and safety in the joint use process. Meanwhile, the thermal conductivity of the thermoplastic matrix is poor, and the temperature change of the welding interface is difficult to obtain by measuring the surface layer temperature.
According to the prior art, the temperature of the welding joint can be monitored by arranging a sensor such as a thermocouple and the like and by other instruments such as an infrared thermometer and the like. However, the additional sensor brings extra cost, the firm fixation is difficult to realize, and the structure of the joint is possibly influenced when the temperature inside the joint is measured; other instruments such as an infrared thermometer are high in cost, and real-time internal monitoring of the welding joint is difficult to achieve.
Disclosure of Invention
The invention aims to solve the technical problem that the temperature of the welding joint of the continuous carbon fiber reinforced thermoplastic composite material cannot be measured by providing a temperature monitoring method for the welding joint of the continuous carbon fiber reinforced thermoplastic composite material.
The invention adopts the following technical scheme:
the invention relates to a temperature monitoring method for a welded joint of a continuous carbon fiber reinforced thermoplastic composite material, which comprises the following steps:
s1, performing surface treatment on an upper joint pair and a lower joint pair which are subjected to ultrasonic direct welding, fixing electrodes, and placing the electrodes in a temperature control box;
s2, acquiring and analyzing signals obtained by the electrode by using a signal processing end, and comparing the signals with a temperature-resistance curve obtained by experiments to realize temperature monitoring of the welding joint.
Specifically, in step S1, the matrix of the upper bonding couple and the lower bonding couple is made of a continuous carbon fiber reinforced thermoplastic composite material.
Further, the volume fraction of the carbon fiber in the continuous carbon fiber reinforced thermoplastic composite material is 20-60%.
Still further, the continuous carbon fiber reinforced thermoplastic composite comprises polyethylene, polyetheretherketone, polyphenylene sulfide, and/or polyethylene terephthalate.
Specifically, in step S1, the surface treatment specifically includes:
the extrudate around the weld interface of the upper and lower bond pairs is cleaned.
Further, conductive paint is smeared on the interface of the cleaned extrudate of the upper joint couple pair and the lower joint couple pair, and then electrodes are respectively connected.
Specifically, in step S1, the electrodes are fixedly connected to the upper bonding couple and the lower bonding couple by means of mechanical compression.
Specifically, in step S1, electrodes are symmetrically disposed at one ends of the upper bonding couple pair and the lower bonding couple pair, respectively.
Specifically, in step S2, a resistance value is recorded once every time the temperature changes by 5 ℃, and the temperature of the temperature control box needs to be kept unchanged for 1 minute when the resistance is recorded every time.
Specifically, in step S2, the actually measured signal is compared with the curve of interface resistance and temperature change, so as to obtain the real-time temperature inside the welded joint.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the temperature monitoring method for the welding joint of the continuous carbon fiber reinforced thermoplastic composite material, the internal temperature of the welding joint is directly monitored by monitoring the change of interface resistance or voltage in the service process of the welding joint, so that the damage to the welding joint structure caused by overhigh or overlow temperature is avoided; by utilizing the characteristic that the resistance of the carbon fiber reinforced material changes along with the change of the environmental temperature, the temperature of a welding interface is monitored in a mode of fixing electrodes at two ends of a conductive network formed after welding, the linearity of a temperature-resistance fitting curve is high, the monitoring sensitivity is high, and the response to the temperature change is rapid.
Furthermore, the carbon fiber has excellent conductivity, and the interface monitoring by utilizing a conductive network naturally formed after the welding is completed is the core of the invention; meanwhile, the carbon fiber reinforced thermoplastic composite material has the advantages of light weight, high modulus, high strength, designability, high temperature resistance, excellent thermal stability, fatigue resistance, corrosion resistance, good manufacturability and the like, and is widely applied.
Further, the volume fraction of matrix fibers of the continuous carbon fiber reinforced thermoplastic composite is between 20% and 60%, and too low or too high a fiber volume fraction results in a decrease in the splice doublet performance.
Further, the continuous carbon fiber reinforced thermoplastic composite matrix comprises polyethylene, polyether ether ketone, polyphenylene sulfide and/or polyethylene terephthalate and other common thermoplastic materials.
Further, after the welding is completed, the thermoplastic matrix is melted and extruded under the combined action of welding heat and welding pressure, and part of fibers are moved together. The fiber wrapped in the polymer can be exposed by removing the superfluous polymer, so that the contact area between the monitoring head and the conductive network during resistance or voltage signal monitoring is increased.
Further, a conductive paint is arranged between the upper bonding couple pair and the lower bonding couple pair, and is used for maximally improving the electric contact between the welding interface and the copper foil and improving the stability of a conductive network.
Furthermore, the electrodes are connected with the conductive network in a mechanical compression mode, so that the electrodes are ensured to be in close contact with the conductive network.
Furthermore, the electrodes are symmetrically arranged along the length direction of the joint couple pair, and the arrangement mode can completely reflect the characteristics of a conductive network formed by ultrasonic welding, so that the monitoring precision is improved.
Further, each time the temperature changes, the temperature is recorded at 5 ℃, so that a more uniform interface temperature gradient is obtained, and the subsequent fitting result is more accurate; when the resistance is recorded, the temperature of the temperature control box is kept stable for 1 minute, and the purpose is to make the interface temperature and the interface resistance stable and then measure so as to obtain a more accurate corresponding relation between the interface temperature and the interface resistance.
Further, the real-time temperature inside the welded joint can be obtained by comparing the actually measured signal with the curve of interface resistance and temperature change.
In summary, the invention monitors the internal temperature of the welding joint by utilizing the performance of the material on the premise of not adding an additional structure, being lower in cost, convenient to operate, stable and reliable.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic diagram of the temperature monitoring principle of a welded joint according to the present invention;
FIG. 2 is a schematic diagram of an interface monitoring method in an ultrasonic welding process;
FIG. 3 is a graph showing the interfacial resistance as a function of temperature as measured by a gradient temperature experiment;
wherein: 11. upper splice mating; 12. a lower splice doublet; 13. a conductive network; 14. an electrode; 15. a signal processing end; 21. a temperature control box; 25. a resistance meter; 26. and (5) conducting wires.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
The invention provides a temperature monitoring method for a welded joint of a continuous carbon fiber reinforced thermoplastic composite material, electrodes are paved at two ends of the joint formed after welding, wherein the electrodes are in contact with a conductive network formed by welding, and are connected with a signal processing end, when the temperature changes, the resistance of the conductive network correspondingly changes due to the comprehensive influence of a thermoplastic matrix and carbon fibers on the temperature change, and the temperature of the welded joint can be monitored by monitoring an electric signal obtained by the signal processing end, so that early warning is carried out on dangerous working temperature, and the influence of overhigh or overlow temperature on the normal working of the welded joint is avoided.
Referring to fig. 1, the theoretical basis of the present invention is as follows:
the two workpieces to be welded are arranged up and down to form an upper joint pair 11 and a lower joint pair 12, the lower surface of the upper joint pair 11 is contacted with fibers on the upper surface of the lower joint pair 12 to form a conductive network 13, the joint of one end of the upper joint pair 11 and the lower joint pair 12, and the joint of one end of the lower joint pair 12 and the upper joint pair 11 is respectively provided with an electrode 14, and the two electrodes 14 are respectively connected with a signal processing end 15 of a resistor.
After the welding process of the carbon fiber reinforced thermoplastic composite material, after the thermoplastic matrix with a thinner surface is melted and extruded, the carbon fiber structures of the welding interfaces of the upper workpiece and the lower workpiece are contacted to form a conductive loop marked black in the figure 1, when the temperature changes, the resistance of the conductive loop can correspondingly change due to the comprehensive influence of the thermoplastic matrix and the carbon fiber on the temperature change, the resistance or the voltage monitoring system can be used for measuring, and the temperature measured by the method is the internal temperature of the welding joint.
The invention discloses a temperature monitoring method for a welded joint of a continuous carbon fiber reinforced thermoplastic composite material, which comprises the following steps:
s1, carrying out surface treatment on the joint pair subjected to direct welding, cleaning redundant extrudate around a welding interface, coating conductive paint on the treated interface, and fixing an electrode connected with a signal processing end.
The matrix in the carbon fiber reinforced material facing the monitoring method is a thermoplastic polymer material, can be repeatedly heated and melted, and can flow after being softened at high temperature, and the matrix comprises polymers such as polyethylene, polyether-ether-ketone, polyphenylene sulfide, polyethylene terephthalate and the like, but is not limited to the polymers, so that the requirement of fusion of the matrix during welding is met; the reinforced carbon fiber has good conductivity and excellent performance, and the two continuous carbon fibers connected in even pairs can be contacted in the welding process to form a conductive network. The mechanical and chemical changes of the matrix and the carbon fibers occurring when the temperature changes can jointly influence the resistance of the conductive network. It should be noted that, since the load carried by the welded joint also affects the conductive network, the temperature monitoring method is mainly applied to the welded joint which is subjected to non-varying load.
After the welding is completed, the thermoplastic matrix is melted and extruded under the combined action of welding heat and welding pressure, and part of fibers are moved together. The fiber wrapped in the polymer can be exposed by removing the superfluous polymer, so that the contact area between the monitoring head and the conductive network during resistance or voltage signal monitoring is increased. Likewise, the arrangement of extremely thin electrodes and the application of conductive paint to the electrode and monitoring area can also increase the electrical contact between the electrode and the conductive network at the interface of the electrode and the junction, thereby avoiding the influence on interface resistance or voltage monitoring caused by poor contact between the electrode and the conductive network. Alternatively, the combination of the extremely thin electrode and the conductive paint can be replaced by conductive glue with strong adhesion. Under the scheme, after the excessive polymer is cleaned, a layer of conductive glue can be directly smeared on the interface after the cleaning is finished, the lead is inserted into the glue layer before the conductive glue is not cured, and the connection of the monitoring circuit is finished after the glue is cured. The mechanical compression can also ensure the close contact of the electrode with the conductive network.
S2, acquiring and analyzing the obtained signals, and comparing the signals with a temperature-resistance curve obtained through experiments, so that the temperature of the welding joint at the moment is obtained.
The real-time temperature of the welding interface can be obtained by comparing the actually measured signal with the curve of the interface resistance and the temperature change in fig. 3.
The invention utilizes the characteristic that the resistance of the carbon fiber in the conductive network changes along with the temperature, and can be applied to other welding processes capable of forming the conductive network in the welding process, such as induction welding, resistance welding and the like, and the two former patents are mainly applied to the monitoring field of ultrasonic welding of continuous carbon fiber reinforced thermoplastic composite materials. According to the above distinguishing points, the final effect is different, the invention mainly focuses on the monitoring of the temperature inside the welding joint, and the first two patents mainly focuses on the monitoring of the ultrasonic welding interface and the welding quality detection.
The mode for monitoring the temperature by utilizing the characteristic that the resistance of the carbon fiber reinforced material is changed along with the change of the temperature is not only limited to the condition of direct connection between the carbon fiber reinforced materials, but also can be applied to the connection between thermoplastic composite materials which use the interface reinforced material with continuous carbon fiber structures (such as carbon nano tubes, graphene and the like) as a reinforced phase.
Meanwhile, because the carbon fiber and the thermoplastic matrix have different changes on temperature change, the response of the material resistance to the temperature change does not have monotonicity, and the temperature measurement interval is required to be definitely or approximately definitely the temperature change trend in actual use so as to accurately measure the temperature change in a certain temperature range.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the embodiments 1 and 2 of the invention, continuous carbon fiber reinforced polycarbonate composite plates with the length of 101.6mm, the width of 25.4mm and the thickness of 2mm are used, wherein the volume fraction of the carbon fibers is 20% -60%.
Referring to fig. 2, the upper bonding couple 11 and the lower bonding couple 12 are placed in a temperature control box 21, and an electrode 14 at a connection between one end of the upper bonding couple 11 and the lower bonding couple 12, and an electrode 14 at a connection between one end of the lower bonding couple 12 and the upper bonding couple 11 are electrically connected to a signal processing end 15 of a resistor 25 through wires 26, respectively.
The present invention will be described in detail with reference to the accompanying drawings.
Example 1
In the temperature interval: and (3) carrying out isothermal difference temperature change experiments on the test piece within 25-85 ℃, and determining the relation between interface resistance and joint temperature:
no reinforcing phase is arranged at a welding interface, and the two composite plates are welded together by ultrasonic direct welding, wherein the welding parameters are welding pressure: 2bar; welding time: 1.2s; and (3) cooling the test piece to room temperature, removing redundant extrudates in the front-back direction of a welded interface, exposing surface carbon fibers, coating conductive silver paint on the interface after the excessive mixture is cleaned, coating the two sides of the conductive silver paint parallel to the length direction of the composite board, covering the part coated with the conductive silver paint with a copper foil of 0.1mm connected with a wire by using an adhesive tape after the conductive silver paint is solidified, fixing the copper foil, and respectively connecting the two wires at the positive electrode and the negative electrode of a resistor to monitor the interface resistance.
And (3) placing the treated test piece in a temperature control box for resistance measurement experiments at a specific temperature, recording a resistance value once when the temperature changes by 5 ℃, keeping the temperature of the temperature control box unchanged for 1 minute when the resistance is recorded each time, recording the initial temperature of 25 ℃ and the final temperature of 85 ℃, wherein the schematic diagram of the monitoring method is shown in figure 2.
The initial resistance was measured to be 0.878Ω, the interfacial resistance was continuously increased with increasing temperature, and the interfacial resistance was 1.024 Ω when the welded joint was stabilized at 85 ℃.
In the temperature range of 25-85 ℃, the resistance is in positive temperature coefficient change (PTC effect) along with the temperature, which is caused by the difference of thermal expansion coefficients between a resin matrix and reinforcing fibers in the composite material, and as the temperature rises, the node spacing between adjacent carbon fibers is increased due to the fact that the thermal expansion coefficient of the resin matrix is far greater than that of the carbon fibers, the conductive paths in the composite material are damaged, particle transition of tunnel current is hindered, and the resistivity is gradually increased. As the temperature increases further, the matrix continues to expand, and the nodes of the conductive network become detached, resulting in a continued increase in the resistivity of the composite material, which overall exhibits the PTC effect.
Example 2
In the temperature interval: and (3) carrying out isothermal difference temperature change experiments on the test piece within 85-105 ℃, and determining the relation between interface resistance and joint temperature:
no reinforcing phase is arranged at a welding interface, and the two composite plates are welded together by ultrasonic direct welding, wherein the welding parameters are welding pressure: 2bar; welding time: 1.2s. And (3) cooling the test piece to room temperature, removing redundant extrudates in the front-back direction of a welded interface, exposing surface carbon fibers, coating conductive silver paint on the interface after the excessive mixture is cleaned, coating the two sides of the conductive silver paint parallel to the length direction of the composite board, covering the part coated with the conductive silver paint with a copper foil of 0.1mm connected with a wire by using an adhesive tape after the conductive silver paint is solidified, fixing the copper foil, and respectively connecting the two wires at the positive electrode and the negative electrode of a resistor to monitor the interface resistance.
And (3) placing the treated test piece in a temperature control box for resistance measurement experiments at a specific temperature, recording a resistance value once when the temperature changes by 5 ℃, keeping the temperature of the temperature control box unchanged for 1 minute when the resistance is recorded each time, and recording the initial temperature of 85 ℃ and the final temperature of 105 ℃, wherein the schematic diagram of the monitoring method is shown in figure 2.
The initial resistance was measured to be 1.026Ω, the interfacial resistance was continuously reduced with an increase in temperature, and the interfacial resistance was 0.867Ω when the welded joint was stabilized at 105 ℃. This is because the carbon fibers composited in the resin matrix have a negative temperature coefficient effect, promote charge thermal activation jump between local fibers at this high temperature, weaken the influence of the tunneling effect between fibers on the conductivity, and thus enhance the conductivity of the whole fiber conductive network.
The overall process interface resistance versus temperature profile from 25 ℃ to 105 ℃ for both examples is shown in figure 3.
Example 3
In the temperature interval: and (3) carrying out a random temperature change experiment on the test piece within 15-75 ℃, and verifying the relation between interface resistance and joint temperature:
in this embodiment, the samples are directly welded by ultrasound to connect, and the welding parameters are as follows: welding pressure: 2bar; welding time: 1.2s, after the test piece is cooled to room temperature, removing redundant extrudates in the front-back direction of a welded interface, exposing surface carbon fibers, coating conductive silver paint on the interface after the excessive mixture is cleaned, coating the two sides of the conductive silver paint to be parallel to the length direction of a composite board, covering a part coated with the conductive silver paint with a copper foil of 0.1mm, which is connected with a wire, by using an adhesive tape after the conductive silver paint is solidified, fixing the copper foil, and respectively connecting the two wires at the positive electrode and the negative electrode of a resistor to monitor the resistance of the interface.
The temperature change is measured continuously within 10 minutes at 15-75 ℃ in the temperature random change environment, and the change of the environmental temperature is recorded.
The measured resistance change trend is consistent with the temperature change trend, the resistance change curve is processed by using the corresponding relation of the resistance and the temperature in the embodiment 1, and the obtained temperature change curve has higher coincidence degree with the actual temperature change curve and smaller error.
In summary, the temperature monitoring method for the welding joint of the continuous carbon fiber reinforced thermoplastic composite material has the advantages of no complex sensor or instrument installation process, simple operation, low cost, high efficiency, stability and no damage to the welding joint structure; the method has the advantages of high sensitivity, simple and convenient installation, simple material, lower cost, high efficiency, stability, no additional structure, wide application range and wide application prospect along with the wide application of the welding of the carbon fiber reinforced thermoplastic composite material.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The method for monitoring the temperature of the welded joint of the continuous carbon fiber reinforced thermoplastic composite material is characterized by comprising the following steps of:
s1, performing surface treatment on an upper joint pair and a lower joint pair which are subjected to ultrasonic direct welding, fixing electrodes, and placing the electrodes in a temperature control box;
s2, acquiring and analyzing signals obtained by the electrode by using a signal processing end, and comparing the signals with a temperature-resistance curve obtained by experiments to realize temperature monitoring of the welding joint.
2. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 1, wherein in the step S1, the matrix of the upper and lower bonding pairs is made of a continuous carbon fiber reinforced thermoplastic composite material.
3. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 2, wherein the volume fraction of carbon fibers in the continuous carbon fiber reinforced thermoplastic composite material is 20% to 60%.
4. A method of monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite according to claim 3, wherein the continuous carbon fiber reinforced thermoplastic composite comprises polyethylene, polyetheretherketone, polyphenylene sulfide and/or polyethylene terephthalate.
5. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 1, wherein in step S1, the surface treatment is specifically:
the extrudate around the weld interface of the upper and lower bond pairs is cleaned.
6. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 5, wherein conductive paint is applied to the interface between the cleaned extrudate of the upper and lower pairs of pairs, and then electrodes are connected respectively.
7. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 1, wherein in the step S1, the electrodes are fixedly connected to the upper and lower bonding pairs, respectively, by means of mechanical compression.
8. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 1, wherein in the step S1, electrodes are symmetrically placed at one ends of an upper bonding couple pair and a lower bonding couple pair, respectively.
9. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 1, wherein in the step S2, the resistance value is recorded every time the temperature changes by 5 ℃, and the temperature of the temperature control box is kept unchanged for 1 minute when the resistance is recorded every time.
10. The method for monitoring the temperature of a welded joint of a continuous carbon fiber reinforced thermoplastic composite material according to claim 1, wherein in step S2, the actual measured signal is compared with the curve of interface resistance and temperature change to obtain the real-time temperature inside the welded joint.
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