Ultrasonic welding process for metal-based composite material

Abstract

The invention discloses an ultrasonic welding process for a metal-based composite material, and relates to the technical field of welding, the ultrasonic welding process comprises the following steps: impurity treatment: polishing the surface of the welding position of the metal-based composite material, and then cleaning the polished metal-based composite material; oxidation layer treatment, wherein plasma cleaning is conducted on the polished position of the metal matrix composite with the impurities removed; material attribute acquisition: randomly selecting a batch of metal-based composite materials, and measuring metal material attributes of the metal-based composite materials; according to the technical key points, by knowing the characteristics of the metal-based composite material and further analyzing and calculating the characteristics of the metal-based composite material, accurate ultrasonic welding parameters of the metal-based composite material are obtained, the link of repeated trial and error in the ultrasonic welding process of the metal-based composite material can be omitted, and the ultrasonic welding efficiency is improved. Therefore, the preorder working time of the metal-based composite material is greatly shortened, the efficiency is high, and the application prospect is good.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to an ultrasonic welding process for metal-based composite materials. Background Art

[0002] With the rapid development of industry, the environment in which workpieces are located is becoming more and more complex. A single material can no longer meet the requirements in different occasions. Combining different materials can give full play to the excellent properties of each material and make the application range of the materials wider. Therefore, people have developed various metal-based composite materials.

[0003] Metal matrix composites are composite materials that are made of metals and their alloys as the matrix and artificially combined with one or more metal or non-metal reinforcements.

[0004] Traditional welding methods cannot perform well due to the large differences in the physical properties of dissimilar metals, especially when applied to metal-based composite materials.

[0005] Ultrasonic welding uses high-frequency vibration waves to transmit to the surfaces of two objects to be welded. Under pressure, the two surfaces of the objects rub against each other to form a fusion between the molecular layers.

[0006] The invention patent with the existing application publication number and the name of an ultra-thin aluminum-copper ultrasonic welding process records that 1060 aluminum alloy plate is used as the base material, T2 copper plate is used as the weldment, and overlapping ultrasonic welding is performed, including the following steps: the surface of the aluminum alloy plate is polished with 800 mesh and 2000 mesh sandpaper respectively; the aluminum alloy plate with the surface polished is first alkali-washed and then pickled, the copper plate is pickled, and then wiped with alcohol, and blown dry with a hair dryer for standby use; the aluminum alloy plate is placed on a surface contact fixture, and the copper plate is overlapped on the upper surface of the aluminum alloy plate, with an overlap width of 24-25mm, and then the two plates are fixed with a fixture; the fixed plates are sent into an ultrasonic welder for welding, and the welding parameter range is as follows: welding pressure 25-70Psi, welding power 450J, welding amplitude 32-60μm, welding time 0.26s; post-weld inspection and analysis: after welding, the appearance of the weld is checked, the mechanical properties of the weld joint are tested, and the weld is deeply observed using SEM.

[0007] However, according to the above contents and in combination with the prior art, the central solution of the solution recorded in the above patent is to introduce the normal metal ultrasonic welding process and provide a complete set of metal ultrasonic welding solutions.

[0008] However, the above scheme has great defects in actual use. In actual use, due to the different metal-based composite materials, the amplitude, pressure and welding time used in ultrasonic welding are different, and the effects achieved are also different. In the existing use process, each material needs to go through many experiments to obtain a more appropriate amplitude, pressure and time data. The process is very cumbersome, and testing is required after each welding. The whole process is very long, which affects the production cycle and does not meet people's use requirements. For this reason, we have developed an ultrasonic welding process for metal-based composite materials. Summary of the invention

[0009] 1. Technical issues to be resolved

[0010] In view of the shortcomings of the prior art, the present invention provides an ultrasonic welding process for metal-based composite materials. The ultrasonic welding process understands the characteristics of the metal-based composite materials, further analyzes and calculates the characteristics of the metal-based composite materials, and thus obtains more accurate ultrasonic welding parameters for the metal-based composite materials. The process of repeated trial and error in ultrasonic welding of metal-based composite materials can be saved, thereby greatly reducing the preliminary working time of the metal-based composite materials. The process is highly efficient, has good use effect, and has good prospects for use.

[0011] (II) Technical solution

[0012] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0013] An ultrasonic welding process for metal matrix composite materials comprises the following steps:

[0014] Debris treatment: Grind the surface of the metal matrix composite material welding position, and then clean the polished metal matrix composite material;

[0015] Oxide layer treatment: Plasma cleaning of the polished area of ​​the metal matrix composite material to remove impurities;

[0016] Material property acquisition: randomly select a batch of metal matrix composite materials and measure the metal material properties of the metal matrix composite materials;

[0017] Welding parameter analysis: Analyze the properties of metal materials and calculate the parameters of ultrasonic welding based on the properties of metal materials;

[0018] Ultrasonic welding: The calculated ultrasonic welding parameters are used to perform ultrasonic welding on the metal matrix composites after plasma cleaning.

[0019] Preferably, in the debris processing step, an angle grinder is used to grind the surface of the welding position of the metal-based composite material at a grinding speed of 10 m / s, and the grinding is carried out to 20-30 mm outside the welding position. During cleaning, the grinding position of the metal-based composite material is first cleaned with a grinding liquid cleaning agent, and then the grinding position of the metal-based composite material is cleaned with deionized water.

[0020] Preferably, a radio frequency plasma cleaning machine is used for plasma cleaning. When the radio frequency plasma cleaning machine cleans the metal-based composite material, a mixed gas of 50% hydrogen and 50% argon is used. The cleaning power of the radio frequency plasma cleaning machine is 220-280W, the cleaning time is 200-300s, the gas flow rate during cleaning is 200sccm, and the gas pressure is 100-200Pa.

[0021] Preferably, the metal material properties of the metal matrix composite material measured include thermal conductivity, specific heat capacity, linear expansion coefficient, thickness of the upper metal matrix composite material, Brinell hardness and oxidizability.

[0022] Preferably, the properties of the metal material are analyzed, and the parameters for ultrasonic welding are calculated according to the properties of the metal material, including:

[0023] Calculate the pressure of ultrasonic welding based on the Brinell hardness;

[0024] Calculate the amplitude of ultrasonic welding based on thermal conductivity, thickness and specific heat capacity;

[0025] The duration of ultrasonic welding is calculated based on the ultrasonic welding pressure, ultrasonic welding amplitude, linear expansion coefficient and oxidation resistance.

[0026] Preferably, the calculation formula for calculating the pressure of ultrasonic welding according to the Brinell hardness is as follows:

[0027]

[0028] Wherein, Hjyl is the calculated ultrasonic welding pressure, δ is the influence coefficient of shear strength on ultrasonic welding pressure, Yd is the Brinell hardness of the metal matrix composite material, a is a constant, and a>1.

[0029] Preferably, the ultrasonic welding amplitude is calculated according to the thermal conductivity, the thickness of the upper metal matrix composite material and the specific heat capacity as follows:

[0030]

[0031] Wherein, Hjzf is the calculated ultrasonic welding amplitude, Hd is the thickness of the metal matrix composite material at the ultrasonic welding position, α is the coefficient of the thickness on the ultrasonic welding amplitude, Brr is the specific heat capacity of the metal matrix composite material, β is the coefficient of the specific heat capacity on the ultrasonic welding amplitude, Drl is the thermal conductivity of the metal matrix composite material, and γ is the coefficient of the thermal conductivity on the ultrasonic welding amplitude.

[0032] Preferably, the duration of ultrasonic welding is calculated according to the pressure of ultrasonic welding, the amplitude of ultrasonic welding, the linear expansion coefficient and the oxidizability:

[0033]

[0034] Wherein, Hjsc is the calculated ultrasonic welding time, A is the influence coefficient of ultrasonic welding pressure and ultrasonic welding amplitude on ultrasonic welding time, Xpz is the linear expansion coefficient, B is the influence coefficient of linear expansion coefficient on ultrasonic welding time, Djds is the electrode potential value, and C is the influence coefficient of oxidation on ultrasonic welding time.

[0035] Preferably, a constant frequency is used during welding, and the metal matrix composite material is welded according to the calculated ultrasonic welding pressure, ultrasonic welding amplitude and ultrasonic welding duration.

[0036] Preferably, the tensile shear force of ultrasonic welding and the average tensile shear force of the metal matrix composite material measured by manual welding are obtained after welding. CS ≥(1+3%)×LSJC rg , that is, the metal matrix composite material welding is qualified, when LSJC CS <(1+3%)×LSJC rg When the welding of metal matrix composite materials is determined to be unqualified.

[0037] (III) Beneficial effects

[0038] The present invention provides an ultrasonic welding process for metal matrix composite materials, which has the following beneficial effects:

[0039] 1. The present invention provides an ultrasonic welding process for metal-based composite materials. The process understands the characteristics of metal-based composite materials, further analyzes and calculates the characteristics of metal-based composite materials, and thus obtains relatively accurate ultrasonic welding parameters for metal-based composite materials. The process of repeated trial and error in ultrasonic welding of metal-based composite materials can be saved, thereby greatly reducing the pre-working time of metal-based composite materials. The process is highly efficient, has good use effect, and has good prospects for use.

[0040] 2. The present invention records an ultrasonic welding process for metal-based composite materials, which processes the metal-based composite materials before ultrasonic welding. The surface of the welding position of the metal-based composite materials is first polished and cleaned to remove debris and part of the oxide layer, and then plasma cleaning is used to completely remove the oxide layer of the metal-based composite materials. In addition, the plasma reacts with the metal surface at the nanoscale to form a microscopically rough and clean metal surface, thereby improving the adhesion between the metal material surface and other materials, and at the same time increasing the roughness of the metal-based composite material surface, so that the metal-based composite materials can generate heat quickly during the ultrasonic welding process, the welding speed is faster, the efficiency is higher, and it has a good prospect for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The present invention is a flow chart of an ultrasonic welding process for a metal-based composite material. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Reasons for research

[0044] The existing ultrasonic welding process is mature, but due to the different metal-based composite materials, the amplitude, pressure and welding time used in ultrasonic welding are different, and the effects achieved are also different. In the current use process, each material needs to go through many experiments to obtain a more appropriate amplitude, pressure and time data. The process is very cumbersome, and testing is required after each welding. The whole process is very long, which affects the production cycle, and the cost is relatively high, which does not meet people's usage requirements.

[0045] Design ideas

[0046] Most of the existing systems are for the welding process of a certain metal or plastic material, and their overall applicability is very low. When welding different materials, separate trial and error are required, resulting in very high manpower and material costs and relatively low efficiency.

[0047] Therefore, during the research and development process, the initial idea was to study the correlation between the material properties and the parameters in the ultrasonic welding process, conduct a large number of experimental tests, and use computer simulations to come up with a basic solution.

[0048] However, in actual use, it was found that due to the differences in materials, the oxide layer on the surface of materials with strong oxidizing properties and materials with weak oxidizing properties has a great influence on welding when used. This is also the reason why the basic plan is very accurate for some materials when implemented, while not so accurate for some materials, and does not meet people's usage requirements.

[0049] Therefore, in the later stage of research and development, the idea was changed. The surface of the material to be welded was ground and polished before ultrasonic welding. Not only the stains on the surface of the material to be welded were removed, but also the oxide layer structure on the surface of the welding material was removed to facilitate better welding. The following ultrasonic welding process for metal-based composite materials was developed.

[0050] Study plan

[0051] An ultrasonic welding process for metal matrix composite materials comprises the following steps:

[0052] Debris treatment: Grind the surface of the metal matrix composite material welding position, and then clean the polished metal matrix composite material;

[0053] In the debris processing step, an angle grinder is used to grind the surface of the welding position of the metal-based composite material at a grinding speed of 10m / s, and the grinding is performed to 20mm-30mm outside the welding position. The selection is mainly based on the accuracy of the ultrasonic welding equipment. 20mm is selected for high accuracy, 30mm is selected for low accuracy, and 25mm is selected for normal accuracy. When cleaning, the grinding position of the metal-based composite material is first cleaned with a grinding liquid cleaning agent. The grinding liquid cleaning agent is selected according to the metal-based composite material. The grinding liquid cleaning agent cleans away the grinding debris, and then deionized water is used to clean the grinding position of the metal-based composite material. The deionized water removes excess grinding liquid cleaning agent.

[0054] Oxide layer treatment: Plasma cleaning of the polished area of ​​the metal matrix composite material to remove impurities;

[0055] A radio frequency plasma cleaning machine is used for plasma cleaning. When the radio frequency plasma cleaning machine cleans metal-based composites, a mixed gas of 50% hydrogen and 50% argon is used. The cleaning power of the radio frequency plasma cleaning machine is 2-0-280W, the cleaning time is 2-0-300s, the gas flow rate during cleaning is 200sccm, and the gas pressure is 1-0-200Pa.

[0056] Due to the different metal matrix composite materials, the cleaning time of the RF plasma cleaning machine is different. The higher the hardness of the metal matrix composite material, the stronger the oxidizing property, the greater the cleaning power, cleaning time, gas flow rate and gas pressure during cleaning.

[0057] The present invention records an ultrasonic welding process for metal-based composite materials, which processes the metal-based composite materials before ultrasonic welding. The surface of the metal-based composite materials at the welding position is first polished and cleaned to remove debris and part of the oxide layer, and then plasma cleaning is used to completely remove the oxide layer of the metal-based composite materials. In addition, the plasma reacts with the metal surface at the nanometer level to form a microscopically rough and clean metal surface, thereby improving the adhesion between the metal material surface and other materials, and at the same time increasing the roughness of the metal-based composite material surface, so that the metal-based composite materials can quickly generate heat during the ultrasonic welding process, the welding speed is faster, the efficiency is higher, and the metal-based composite materials have good application prospects.

[0058] Material property acquisition: randomly select a batch of metal matrix composite materials and measure the metal material properties of the metal matrix composite materials;

[0059] The thermal conductivity, specific heat capacity, linear expansion coefficient, Brinell hardness and oxidizability of the same batch of metal matrix composites are the same, but there are certain differences in the thickness of the upper layer of the metal matrix composite.

[0060] The metal material properties measured for MMCs include thermal conductivity, specific heat capacity, linear expansion coefficient, thickness of the upper MMC layer, Brinell hardness, and oxidation resistance.

[0061] Welding parameter analysis: Analyze the properties of metal materials and calculate the parameters of ultrasonic welding based on the properties of metal materials;

[0062] Analyze the properties of metal materials and calculate the parameters of ultrasonic welding based on the properties of metal materials, including:

[0063] Calculate the pressure of ultrasonic welding based on the Brinell hardness;

[0064] The hardness of materials is different. For the same material, within a certain range, as the pressure increases, the friction temperature rises faster, the ultrasonic welding temperature rises faster, and the ultrasonic welding time is shorter. However, when the pressure increases to a certain level, the material will be deformed and the friction of the material movement will be affected, resulting in a slow temperature rise, which in turn prolongs the temperature rise rate. Therefore, strict restrictions on welding are required.

[0065] The formula for calculating the pressure of ultrasonic welding based on the Brinell hardness is as follows:

[0066]

[0067] Where Hjyl is the calculated ultrasonic welding pressure, δ is the influence coefficient of shear strength on ultrasonic welding pressure, Yd is the Brinell hardness of the metal matrix composite material, a is a constant, a>1;

[0068] After testing, it was found that a is related to metal matrix composite materials. For normal aluminum alloy materials, a is 2. After a lot of data and experiments, δ is calculated by computer and is 35-40, and is normally 36.

[0069] Calculate the amplitude of ultrasonic welding based on thermal conductivity, thickness and specific heat capacity;

[0070] The higher the amplitude, the faster the temperature rises. However, if the temperature is too high, the metal matrix composite material will partially melt. Therefore, the amplitude cannot be increased indefinitely. Different thicknesses and thermal conductivity, different thermal conductivity rates, different specific heat capacities, and different rising temperatures will ensure that the temperature rises to a certain level within a period of time and that the speed of ultrasonic welding is guaranteed. Therefore, thermal conductivity, thickness, and specific heat capacity must be considered.

[0071] The calculation formula for ultrasonic welding amplitude is calculated based on thermal conductivity, thickness of upper metal matrix composite material and specific heat capacity as follows:

[0072]

[0073] Wherein, Hjzf is the calculated ultrasonic welding amplitude, Hd is the thickness of the metal matrix composite material at the ultrasonic welding position, α is the coefficient of the thickness on the ultrasonic welding amplitude, Brr is the specific heat capacity of the metal matrix composite material, β is the coefficient of the specific heat capacity on the ultrasonic welding amplitude, Drl is the thermal conductivity of the metal matrix composite material, and γ is the coefficient of the thermal conductivity on the ultrasonic welding amplitude;

[0074] α, β and γ are obtained by computer statistics after analyzing previous data.

[0075] The duration of ultrasonic welding is calculated based on the ultrasonic welding pressure, ultrasonic welding amplitude, linear expansion coefficient and oxidation resistance.

[0076] For the same material, the ultrasonic welding time is inversely proportional to the ultrasonic welding pressure and the ultrasonic welding amplitude. However, in application, it is found that due to the characteristics of the material, the material with large ultrasonic welding pressure and ultrasonic welding amplitude generally has a low linear expansion coefficient, high oxidation resistance, and a high melting point, and the ultrasonic welding time required is also long.

[0077] By using computers to analyze previous alloy materials, the following formula was obtained.

[0078] Because welding is done in the air, and plasma cleaning to ultrasonic welding are located in two stations and exist for a period of time, local oxidation will still occur. Therefore, oxidation still needs to be considered, but plasma cleaning greatly reduces the impact of oxidation.

[0079] The duration of ultrasonic welding is calculated based on the pressure of ultrasonic welding, the amplitude of ultrasonic welding, the linear expansion coefficient and the oxidation resistance:

[0080]

[0081] Wherein, Hjsc is the calculated ultrasonic welding time, A is the influence coefficient of ultrasonic welding pressure and ultrasonic welding amplitude on ultrasonic welding time, Xpz is the linear expansion coefficient, B is the influence coefficient of linear expansion coefficient on ultrasonic welding time, Djds is the electrode potential value, and C is the influence coefficient of oxidation on ultrasonic welding time.

[0082] The oxidizability can be directly obtained from the electrode potential value.

[0083] The above parameters are mainly applicable to the welding of the same metal matrix composite materials. Although the above scheme can also be used for dissimilar materials, the results need to be adaptively adjusted. For example, for two groups of metal matrix composite materials with a large difference in melting points, a certain ratio needs to be extended.

[0084] Ultrasonic welding: The calculated ultrasonic welding parameters are used to perform ultrasonic welding on the metal matrix composites after plasma cleaning.

[0085] A constant frequency is adopted during welding, and the metal matrix composite material is welded according to the calculated ultrasonic welding pressure, ultrasonic welding amplitude and ultrasonic welding time.

[0086] For example, aluminum alloys usually use a frequency of 20-70Khz, which is selected based on the thickness and type of metal matrix composite material.

[0087] After welding, the tensile shear force of ultrasonic welding and the average tensile shear force measured by manual welding of the metal matrix composite material were obtained. CS ≥(1+3%)×LSJC rg , that is, the metal matrix composite material welding is qualified, when LSJC CS <(1+3%)×LSJC rg When the welding of metal matrix composite materials is determined to be unqualified.

[0088] LSJC CS <(1+3%)×LSJC rg It is usually the welding of dissimilar metal-based composite materials, and the error is not large. In this case, it is necessary to increase the pressure, amplitude and duration of ultrasonic welding. It can be adjusted based on experience and trial and error, or it can be increased by 1% each time. It only takes a few times to get the appropriate ultrasonic welding parameters.

[0089] The present invention provides an ultrasonic welding process for metal-based composite materials. The process understands the characteristics of the metal-based composite materials, further analyzes and calculates the characteristics of the metal-based composite materials, thereby obtaining relatively accurate ultrasonic welding parameters for the metal-based composite materials. The process of repeated trial and error during ultrasonic welding of the metal-based composite materials can be saved, thereby greatly reducing the pre-working time of the metal-based composite materials. The process has high efficiency, good use effect, and good use prospects.

[0090] The above formula is a formula obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0091] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0092] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0093] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. An ultrasonic welding process for metal matrix composite materials, characterized in that: The following steps are involved: Debris treatment: Grind the surface of the metal matrix composite material welding position, and then clean the polished metal matrix composite material; Oxide layer treatment: Plasma cleaning of the polished area of ​​the metal matrix composite material to remove impurities; Material property acquisition: randomly select a batch of metal matrix composite materials and measure the metal material properties of the metal matrix composite materials; Welding parameter analysis: Analyze the properties of metal materials and calculate the parameters of ultrasonic welding based on the properties of metal materials; Ultrasonic welding: The calculated ultrasonic welding parameters are used to perform ultrasonic welding on the metal matrix composites after plasma cleaning.

2. The ultrasonic welding process for metal matrix composite materials according to claim 1, characterized in that: In the debris processing step, an angle grinder is used to grind the surface of the welding position of the metal-based composite material at a grinding speed of 10 m / s, and the grinding speed is 10 m / s to 20-30 mm outside the welding position. When cleaning, the grinding position of the metal-based composite material is first cleaned with a grinding liquid cleaning agent, and then the grinding position of the metal-based composite material is cleaned with deionized water.

3. The ultrasonic welding process for metal matrix composite materials according to claim 2, characterized in that: A radio frequency plasma cleaning machine is used for plasma cleaning. When the radio frequency plasma cleaning machine cleans metal-based composite materials, a mixed gas of 50% hydrogen and 50% argon is used. The cleaning power of the radio frequency plasma cleaning machine is 220-280W, the cleaning time is 200-300s, the gas flow rate during cleaning is 200sccm, and the gas pressure is 100-200Pa.

4. The ultrasonic welding process for metal matrix composite materials according to claim 3, characterized in that: The metal material properties measured for MMCs include thermal conductivity, specific heat capacity, linear expansion coefficient, thickness of the upper MMC layer, Brinell hardness, and oxidation resistance.

5. The ultrasonic welding process for metal matrix composite materials according to claim 4, characterized in that: Analyze the properties of metal materials and calculate the parameters of ultrasonic welding based on the properties of metal materials, including: Calculate the pressure of ultrasonic welding based on the Brinell hardness; Calculate the amplitude of ultrasonic welding based on thermal conductivity, thickness and specific heat capacity; The duration of ultrasonic welding is calculated based on the ultrasonic welding pressure, ultrasonic welding amplitude, linear expansion coefficient and oxidation resistance.

6. The ultrasonic welding process for metal matrix composite materials according to claim 5, characterized in that: The formula for calculating the pressure of ultrasonic welding based on the Brinell hardness is as follows: Wherein, Hjyl is the calculated ultrasonic welding pressure, δ is the influence coefficient of shear strength on ultrasonic welding pressure, Yd is the Brinell hardness of the metal matrix composite material, a is a constant, and a>1.

7. The ultrasonic welding process for metal matrix composite materials according to claim 6, characterized in that: The calculation formula for ultrasonic welding amplitude is calculated based on thermal conductivity, thickness of upper metal matrix composite material and specific heat capacity as follows: Wherein, Hjzf is the calculated ultrasonic welding amplitude, Hd is the thickness of the metal matrix composite material at the ultrasonic welding position, α is the coefficient of the thickness on the ultrasonic welding amplitude, Brr is the specific heat capacity of the metal matrix composite material, β is the coefficient of the specific heat capacity on the ultrasonic welding amplitude, Drl is the thermal conductivity of the metal matrix composite material, and γ is the coefficient of the thermal conductivity on the ultrasonic welding amplitude.

8. The ultrasonic welding process for metal matrix composite materials according to claim 7, characterized in that: The duration of ultrasonic welding is calculated based on the pressure of ultrasonic welding, the amplitude of ultrasonic welding, the linear expansion coefficient and the oxidation resistance: Wherein, Hjsc is the calculated ultrasonic welding time, A is the influence coefficient of ultrasonic welding pressure and ultrasonic welding amplitude on ultrasonic welding time, Xpz is the linear expansion coefficient, B is the influence coefficient of linear expansion coefficient on ultrasonic welding time, Djds is the electrode potential value, and C is the influence coefficient of oxidation on ultrasonic welding time.

9. The ultrasonic welding process for metal matrix composite materials according to claim 8, characterized in that: A constant frequency is adopted during welding, and the metal matrix composite material is welded according to the calculated ultrasonic welding pressure, ultrasonic welding amplitude and ultrasonic welding time.

10. The ultrasonic welding process for metal matrix composite materials according to claim 9, characterized in that: After welding, the tensile shear force of ultrasonic welding and the average tensile shear force measured by manual welding of the metal matrix composite material were obtained. CS ≥(1+3%)×LSJC rg , that is, the metal matrix composite material welding is qualified, when LSJC CS <(1+3%)×LSJC rg When the welding of metal matrix composite materials is determined to be unqualified.

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