Method for improving fatigue strength of high-strength aluminum alloy friction welding joint through electric pulse aging treatment

Abstract

The invention discloses a method for improving the fatigue strength of a high-strength aluminum alloy friction welding joint through electric pulse aging treatment. The method is specifically implemented according to the following steps that 1, a 7050 aluminum alloy welding structural part is prepared through a linear friction welding method; 2, a needed strip-shaped sample is prepared on the welded joint through a linear cutting method, and then the surface of the sample is pre-ground; 3, clamping the strip-shaped sample treated in the step 2 between two copper electrodes of electric pulse equipment; 4, the electric pulse processing range is controlled by adjusting the clamping distance; the pulse current density is controlled by adjusting the electric pulse charging voltage, the pulse frequency and the pulse time; and 5, after electric pulse treatment, the sample is air-cooled to the room temperature, then aging treatment is conducted, the aging treatment temperature and time are regulated and controlled, and after the sample is cooled again to the room temperature, the high-cycle fatigue strength of the sample is tested. According to the method, the 7050 aluminum alloy friction welding joint structure is regulated and controlled through electric pulse and aging treatment, so that the high-cycle fatigue performance of the joint is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric pulse aging treatment methods, and specifically relates to a method for improving fatigue strength of a high-strength aluminum alloy friction welding joint through electric pulse aging treatment. Background Art

[0002] Due to its excellent strength, good fatigue performance and corrosion resistance, 7050 aluminum alloy is widely used in the aerospace field, especially in the aircraft fuselage, wing beams, wing ribs and other load-bearing components, as well as the aircraft's structural components, wings and tail frame parts. Traditional large aircraft structural load-bearing components are prepared by forging and milling methods, which results in serious material waste. Linear friction welding (LFW), as a high-quality solid-phase connection method, can overcome the shortcomings of traditional fusion welding processes. The aluminum alloy structural parts prepared by it are not constrained by the size of the welding section. The preformed semi-finished parts can be directly welded into an integral structure, and then the joints with similar strength to the overall structural parts can be obtained through fine machining. However, the high thermal conductivity of aluminum alloy makes it easy for the joints to produce tiny defects during the welding process, forming weak joints; in addition, due to the large differences in the organization of the joints in various regions, the grains in the heat-affected zone are distorted, and there is a large residual stress, which reduces the fatigue performance of the joints. Summary of the invention

[0003] The purpose of the present invention is to provide a method for improving fatigue strength of high-strength aluminum alloy friction welding joints by electric pulse aging treatment, and to regulate the microstructure of 7050 aluminum alloy friction welding joints by electric pulse plus aging treatment, thereby improving the high cycle fatigue performance of the joints.

[0004] The technical solution adopted by the present invention is a method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment, which is specifically implemented according to the following steps: Step 1, preparing 7050 aluminum alloy welded structural parts by linear friction welding method; Step 2: Prepare the required strip specimens from the welded joint by wire cutting method, and then pre-grind the surface of the specimens; Step 3, clamping the strip sample processed in step 2 between two copper electrodes of an electric pulse device; Step 4, controlling the range of the electric pulse treatment by adjusting the clamping distance; controlling the pulse current density by adjusting the electric pulse charging voltage, pulse frequency and pulse time; Step 5: After the electric pulse treatment, the sample is air-cooled to room temperature, and then subjected to aging treatment. The aging treatment temperature and time are adjusted. After cooling to room temperature again, the high cycle fatigue strength of the sample is tested.

[0005] The present invention is also characterized in that: In step 1, the process parameter range of linear friction welding of 7050 aluminum alloy is: vibration frequency 20 Hz ~ 50 Hz, amplitude 2 mm ~ 5 mm, welding pressure 50 MPa ~ 100 MPa, upsetting pressure 50 MPa ~ 100 MPa, and holding time 5 s ~ 20 s.

[0006] In step 2, the sample size is 90 mm × 20 mm × 3 mm.

[0007] In step 2, the surface of the sample is ground by a grinder to control the surface processing accuracy within 0.03 mm.

[0008] In step 3, the dimensions of the two copper electrodes are both 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0009] In step 4, the electric pulse processing parameter range is: charging voltage is 10V~80V, pulse frequency is 50Hz~300Hz, and pulse time is 50s~200s.

[0010] In step 5, the aging treatment is carried out in a high temperature box-type resistance furnace, the aging temperature is 100° C. to 300° C., and the aging time is 10 h to 30 h.

[0011] In step 5, the high cycle fatigue strength of the joint is tested using fatigue specimens, and the high cycle fatigue performance of the joint under different electric pulse plus aging treatment parameters is analyzed.

[0012] The beneficial effect of the present invention is that the method of improving fatigue strength of high-strength aluminum alloy friction welding joints by electric pulse aging treatment can achieve local regulation of joint structure without affecting the parent material structure. Through this method, not only can the good strength of the joint be guaranteed, but also the high-cycle fatigue performance of the joint can be significantly improved, which has significant practical application value and can improve the overall reliability and service life of aluminum alloy welded structural parts, especially in high-requirement fields such as aerospace. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the experimental process of the method for improving fatigue strength of the friction welded joint of high-strength aluminum alloy by electric pulse aging treatment; Figure 2 This is the microstructure diagram of the weld zone of the welded joint obtained in Example 2 of the method for improving fatigue strength of a high-strength aluminum alloy friction welded joint by electric pulse aging treatment of the present invention; Figure 3 This is a fatigue fracture position diagram of the untreated joint after welding in Example 2 of the method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment of the present invention; Figure 4This is a fatigue fracture morphology diagram of an untreated joint after welding in Example 2 of the method for improving fatigue strength of a high-strength aluminum alloy friction welded joint by electric pulse aging treatment of the present invention; Figure 5 This is the microstructure diagram of the weld zone of the electric pulse plus aging treatment joint obtained in Example 2 of the method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment of the present invention; Figure 6 This is a fatigue fracture position diagram of a joint subjected to electric pulse aging treatment obtained in Example 2 of the method for improving fatigue strength of a high-strength aluminum alloy friction welded joint subjected to electric pulse aging treatment of the present invention; Figure 7 This is a fatigue fracture morphology diagram of a joint subjected to electric pulse aging treatment obtained in Example 2 of the method for improving fatigue strength of a high-strength aluminum alloy friction welded joint subjected to electric pulse aging treatment of the present invention; Figure 8 This is a schematic diagram of the microstructure evolution of the weld zone of the joint before and after the electric pulse plus aging treatment obtained in Example 2 of the method for improving fatigue strength of a high-strength aluminum alloy friction welded joint by electric pulse aging treatment of the present invention. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment of the present invention is specifically implemented according to the following steps: Step 1, preparing 7050 aluminum alloy welded structural parts by linear friction welding method; In step 1, the process parameter range of linear friction welding of 7050 aluminum alloy is: vibration frequency 20Hz~50Hz, amplitude 2mm~5mm, welding pressure 50MPa~100MPa, upsetting pressure 50MPa~100MPa, holding time 5s~20s; Step 2: Prepare the required strip specimens from the welded joint by wire cutting method, and then pre-grind the surface of the specimens; In step 2, the sample size is 90 mm × 20 mm × 3 mm, and the sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm; Step 3, clamping the strip sample processed in step 2 between two copper electrodes of an electric pulse device; In step 3, the dimensions of the two copper electrodes are both 240 mm × 30 mm × 3.2 mm, and the effective distance between the two copper electrodes is 50 mm; Step 4, controlling the range of the electric pulse treatment by adjusting the clamping distance; controlling the pulse current density by adjusting the electric pulse charging voltage, pulse frequency and pulse time; In step 4, the electric pulse treatment parameter range is: charging voltage is 10V~80V, pulse frequency is 50Hz~300Hz, and pulse time is 50s~200s; Step 5: After the electric pulse treatment, the sample is air-cooled to room temperature, and then subjected to aging treatment. The aging treatment temperature and time are adjusted. After cooling to room temperature again, the high cycle fatigue strength of the sample is tested. In step 5, the aging treatment is carried out in a high-temperature box-type resistance furnace, the aging temperature is between 100°C and 300°C, the aging time is between 10h and 30h, the high-cycle fatigue strength of the joint is tested using fatigue specimens, and the high-cycle fatigue performance of the joint under different electric pulse plus aging treatment parameters is analyzed.

[0016] The present invention combines the methods of electric pulse treatment and aging treatment to coordinately regulate the organizational properties of the joint. As a local rapid heat treatment technology, electric pulse treatment uses the synergistic effect of the electron wind non-thermal effect and the Joule thermal effect to locally regulate the joint without affecting other areas. Since the peak temperature of the electric pulse is only a few dozen degrees, the electron wind non-thermal effect is mainly used to reduce the nucleation energy of recrystallization, promote grain refinement, and then transform the joint structure into an almost completely recrystallized equiaxed structure. At the same time, electric pulse treatment can open dislocation entanglements, improve the plasticity of the joint, and reduce the crack propagation rate, thereby effectively improving the fatigue performance of the joint. Aging treatment further homogenizes the joint structure and reduces residual stress.

[0017] Example 1 The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment is specifically implemented in the following steps: Step 1: Prepare 7050 aluminum alloy welded structural parts by linear friction welding method. The process parameters of 7050 aluminum alloy linear friction welding are: vibration frequency 30 Hz, amplitude 4 mm, welding pressure 100 MPa, upsetting pressure 100 MPa, and holding time 5 s; Step 2: The sample size is 90 mm × 20 mm × 3 mm. The sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm. Step 3: clamp the processed strip sample between two copper electrodes of the electric pulse device. The dimensions of the two copper electrodes are 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0018] Step 4: Adjust the electric pulse processing parameters as follows: charging voltage is 30 V, pulse frequency is 300 Hz, and pulse time is 200 s.

[0019] Step 5: After the electric pulse treatment, air cool to room temperature, and carry out aging treatment in a high-temperature box-type resistance furnace. The aging temperature is adjusted to 100°C and the aging time is 30h. The high-cycle fatigue strength of the joint is tested using fatigue specimens.

[0020] After the above steps, the high cycle fatigue strength of the joint reaches 200MPa.

[0021] Example 2 The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment is specifically implemented in the following steps: Step 1: Prepare 7050 aluminum alloy welded structural parts by linear friction welding method. The process parameters of 7050 aluminum alloy linear friction welding are: vibration frequency 40 Hz, amplitude 3 mm, welding pressure 80 MPa, upsetting pressure 80 MPa, and holding time 10 s; Step 2: The sample size is 90 mm × 20 mm × 3 mm. The sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm. Step 3: clamp the processed strip sample between two copper electrodes of the electric pulse device. The dimensions of the two copper electrodes are 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0022] Step 4: Adjust the electric pulse processing parameters as follows: charging voltage is 40V, pulse frequency is 250Hz, and pulse time is 150s.

[0023] Step 5: After the electric pulse treatment, air cool to room temperature, and carry out aging treatment in a high-temperature box-type resistance furnace. The aging temperature is adjusted to 150°C and the aging time is 28h. The high-cycle fatigue strength of the joint is tested using fatigue specimens.

[0024] After the above steps, the high cycle fatigue strength of the joint reaches 200MPa. The microstructure evolution of the weld zone of the joint before and after the electric pulse aging treatment is as follows: Figure 8 shown.

[0025] Example 3 The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment is specifically implemented in the following steps: Step 1: Prepare 7050 aluminum alloy welded structural parts by linear friction welding method. The process parameters of 7050 aluminum alloy linear friction welding are: vibration frequency 40 Hz, amplitude 4 mm, welding pressure 70 MPa, upsetting pressure 70 MPa, and holding time 10 s; Step 2: The sample size is 90 mm × 20 mm × 3 mm. The sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm. Step 3: clamp the processed strip sample between two copper electrodes of the electric pulse device. The dimensions of the two copper electrodes are 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0026] Step 4: Adjust the electric pulse processing parameters as follows: charging voltage is 50 V, pulse frequency is 200 Hz, and pulse time is 150 s.

[0027] Step 5: After the electric pulse treatment, air cool to room temperature, and carry out aging treatment in a high-temperature box-type resistance furnace. The aging temperature is adjusted to 200°C and the aging time is 24h. The high-cycle fatigue strength of the joint is tested using fatigue specimens.

[0028] After the above steps, the high cycle fatigue strength of the joint reaches 200MPa.

[0029] Example 4 The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment is specifically implemented in the following steps: Step 1: Prepare 7050 aluminum alloy welded structural parts by linear friction welding method. The process parameters of 7050 aluminum alloy linear friction welding are: vibration frequency 50 Hz, amplitude 3 mm, welding pressure 80 MPa, upsetting pressure 80 MPa, and holding time 15 s; Step 2: The sample size is 90 mm × 20 mm × 3 mm. The sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm. Step 3: clamp the processed strip sample between two copper electrodes of the electric pulse device. The dimensions of the two copper electrodes are 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0030] Step 4: Adjust the electric pulse processing parameters as follows: charging voltage is 60V, pulse frequency is 100Hz, and pulse time is 100s.

[0031] Step 5: After the electric pulse treatment, air cool to room temperature, and carry out aging treatment in a high-temperature box-type resistance furnace. The aging temperature is adjusted to 250°C and the aging time is 20h. The high-cycle fatigue strength of the joint is tested using fatigue specimens.

[0032] After the above steps, the high cycle fatigue strength of the joint reaches 200MPa.

[0033] Example 5 The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment is specifically implemented in the following steps: Step 1: Prepare 7050 aluminum alloy welded structural parts by linear friction welding method. The process parameters of 7050 aluminum alloy linear friction welding are: vibration frequency 50 Hz, amplitude 5 mm, welding pressure 50 MPa, upsetting pressure 50 MPa, and holding time 20 s; Step 2: The sample size is 90 mm × 20 mm × 3 mm. The sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm. Step 3: clamp the processed strip sample between two copper electrodes of the electric pulse device. The dimensions of the two copper electrodes are 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0034] Step 4: Adjust the electric pulse processing parameters as follows: charging voltage is 80 V, pulse frequency is 50 Hz, and pulse time is 200 s.

[0035] Step 5: After the electric pulse treatment, air cool to room temperature, and carry out aging treatment in a high-temperature box-type resistance furnace. The aging temperature is adjusted to 300°C and the aging time is 25h. The high-cycle fatigue strength of the joint is tested using fatigue specimens.

[0036] After the above steps, the high cycle fatigue strength of the joint reaches 200MPa. Example 6 The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment is specifically implemented in the following steps: Step 1: Prepare 7050 aluminum alloy welded structural parts by linear friction welding method, and the process parameters of 7050 aluminum alloy linear friction welding are: vibration frequency 50 Hz, amplitude 5 mm, welding pressure 100 MPa, upsetting pressure 100 MPa, and holding time 20 s; Step 2: The sample size is 90 mm × 20 mm × 3 mm. The sample surface is ground by a grinder to control the surface processing accuracy within 0.03 mm. Step 3: clamp the processed strip sample between two copper electrodes of the electric pulse device. The dimensions of the two copper electrodes are 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

[0037] Step 4: Adjust the electric pulse processing parameters as follows: charging voltage is 80 V, pulse frequency is 300 Hz, and pulse time is 200 s.

[0038] Step 5: After the electric pulse treatment, air cool to room temperature, and carry out aging treatment in a high-temperature box-type resistance furnace. The aging temperature is adjusted to 300°C and the aging time is 30h. The high-cycle fatigue strength of the joint is tested using fatigue specimens.

[0039] After the above steps, the high cycle fatigue strength of the joint reaches 200MPa.

[0040] Figure 1 The present invention is a schematic diagram of the experimental process of the method for improving fatigue strength of high-strength aluminum alloy friction welding joints by electric pulse aging treatment. In this experiment, 7050 aluminum alloy linear friction welding joints were subjected to electric pulse treatment by electroplastic pulse equipment. In the experiment, the sample was clamped between the electrodes using the positive and negative electrode clamps of the pulse power supply. The clamps were made of pure copper material and had a size of 240 mm × 30 mm × 3.2 mm. A digital oscilloscope was connected to the positive and negative electrodes of the pulse power supply to test and record the relevant parameters of the pulse current during the experiment. By adjusting variables such as pulse charging voltage, pulse frequency and pulse time, precise control of the joint structure can be achieved. After the treatment is completed, the sample is air-cooled to room temperature and then subjected to aging heat treatment in a high-temperature box-type resistance furnace. By adjusting the temperature and time of the aging treatment, the organizational properties of the joint are further optimized, and the desired sample is finally obtained.

[0041] Figure 2 This is the microstructure diagram of the weld area of ​​the welded joint obtained in Example 2. The lamellar grains existing in the original base material disappear, the grains are significantly refined and more uniform, the matrix α solid solution is equiaxed and part of the structure is recrystallized, and a small amount of corrosion phase and residual second phase structure exist between the dendrites.

[0042] Figure 3 This is a fatigue fracture position diagram of the untreated joint after welding in Example 2. Figure 3 It can be seen that the crack initiation zone of the original welded joint is located in the center of the weld, and the crack propagates in a straight line along the weld area, with almost no bending in the entire crack propagation path. This shows that the welded joint has a certain fatigue sensitivity, and the crack is easy to initiate in the weld area and propagate in a straight line.

[0043] Figure 4 Fatigue fracture morphology of the untreated joint after welding in Example 2. It can be seen from the figure that the fatigue source ( Figure 4 a) There is no obvious radial crack extension direction in the crack extension zone ( Figure 4 b) shows a typical river pattern structure, and a small amount of fatigue bands are observed. In the instantaneous fracture zone, intergranular fracture characteristics can be clearly seen. Therefore, the fracture mode of the original welded joint is a typical cleavage fracture, indicating that its fatigue performance is poor, the crack propagates rapidly, and intergranular fracture is prone to occur.

[0044] Figure 5This is the microstructure diagram of the weld zone of the joint treated with electric pulse and aging obtained in Example 2. Through the electric pulse and aging treatment, the grains in the weld zone are significantly refined, forming an almost completely equiaxed recrystallized structure, and the second phase precipitated in the weld zone increases. This change is caused by the coordinated regulation of electron wind and Joule heat. In this process, the nucleation barrier is reduced, making dislocation entanglement a nucleation site for recrystallization, thereby promoting the refinement of grains in the weld zone and the homogenization of the structure.

[0045] Figure 6 This is the fatigue fracture position diagram of the joint treated with electric pulse and aging obtained in Example 2. As can be seen from the figure, the fatigue crack propagation path of the joint after electric pulse and aging treatment presents a tortuous shape. The crack initiation position is located in the weld area, and gradually turns to the thermally affected zone as the crack propagates. This shows that the electric pulse and aging treatment effectively changes the crack propagation behavior of the joint, making it present a more complex crack propagation path than the untreated joint, reflecting the stronger crack resistance of the joint under fatigue load.

[0046] Figure 7 This is the fatigue fracture morphology of the joint treated with electric pulse and aging obtained in Example 2. It can be seen from the figure that after the electric pulse and aging treatment, the fatigue source ( Figure 7 a) shows obvious radial crack extension direction, indicating that there is significant crack extension activity in the initial stage. Figure 7 b) A large number of clear fatigue bands can be seen. The presence of such fatigue bands usually indicates the regularity of the crack propagation path and the lower crack propagation rate, which is beneficial to improving the fatigue resistance and fatigue strength of the joint. Figure 7 c) is composed of a large number of equiaxed dimples, which are typical ductile fracture modes, indicating that the fatigue resistance of the joint is significantly improved and exhibits good fatigue strength. Overall, after the electric pulse plus aging treatment, the fatigue performance of the joint has been significantly improved.

[0047] In summary, the high cycle fatigue strength of the 7050 aluminum alloy joint is lower than 57% of the base material in the welded state, and is increased to more than 67% of the base material after electric pulse plus aging treatment, indicating that this treatment method can effectively regulate the organizational structure of the joint and significantly improve the fatigue performance of the joint. This result not only has important theoretical significance, but also has a wide range of engineering application value, especially in structural connectors such as aerospace that require extremely high strength and high fatigue performance, proving the great potential of this method in improving the fatigue performance of aluminum alloy joints.

Claims

1. A method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment, characterized in that: Follow the steps below to implement it: Step 1, preparing 7050 aluminum alloy welded structural parts by linear friction welding method; Step 2: Prepare the required strip specimens from the welded joint by wire cutting method, and then pre-grind the surface of the specimens; Step 3, clamping the strip sample processed in step 2 between two copper electrodes of an electric pulse device; Step 4, controlling the range of the electric pulse treatment by adjusting the clamping distance; controlling the pulse current density by adjusting the electric pulse charging voltage, pulse frequency and pulse time; Step 5: After the electric pulse treatment, the sample is air-cooled to room temperature, and then subjected to aging treatment. The aging treatment temperature and time are adjusted. After cooling to room temperature again, the high cycle fatigue strength of the sample is tested.

2. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In the step 1, the process parameter range of the linear friction welding of 7050 aluminum alloy is: vibration frequency 20 Hz to 50 Hz, amplitude 2 mm to 5 mm, welding pressure 50 MPa to 100 MPa, upsetting pressure 50 MPa to 100 MPa, and holding time 5 s to 20 s.

3. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In step 2, the sample size is 90 mm×20 mm×3 mm.

4. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In step 2, the surface of the sample is ground by a grinder to control the surface processing accuracy within 0.03 mm.

5. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In step 3, the dimensions of the two copper electrodes are both 240 mm×30 mm×3.2 mm, and the effective distance between the two copper electrodes is 50 mm.

6. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In step 4, the electric pulse treatment parameter range is: charging voltage is 10V~80V, pulse frequency is 50Hz~300Hz, and pulse time is 50s~200s.

7. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In the step 5, the aging treatment is carried out in a high-temperature box-type resistance furnace, the aging temperature is 100° C. to 300° C., and the aging time is 10 h to 30 h.

8. The method for improving fatigue strength of high-strength aluminum alloy friction welded joints by electric pulse aging treatment according to claim 1, characterized in that: In step 5, the high cycle fatigue strength of the joint is tested using fatigue specimens, and the high cycle fatigue performance of the joint under different electric pulse plus aging treatment parameters is analyzed.

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