Inertia friction welding system and method capable of adjusting pressure

Abstract

The invention provides an inertia friction welding system and method capable of adjusting pressure, relates to the field of inertia friction welding, and aims to solve the problems that cracks and flashes possibly appear in a welding area due to improper control of welding pressure and temperature at present, and particularly, a workpiece is prone to instability and deformation due to large post-peak torque in the welding ending stage. The torque of workpieces to be welded and the temperature of a welding friction interface in the welding process are obtained through the strain gauges and the temperature monitor, the pressure between the workpieces to be welded is adjusted through the servo feeding assembly, and temperature monitoring in the inertia friction welding process can be achieved through the temperature monitor; the structure property deterioration caused by too high welding temperature is avoided by adjusting the friction pressure, and the welding joint quality is improved; by means of the strain gauges, torque monitoring in the inertia friction welding process can be achieved, overlarge rear peak torque is avoided by adjusting friction pressure, instability deformation is prevented, welding forming is improved, and the quality problems of instability deformation, flash cracking and the like are effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of inertia friction welding, and in particular to an inertia friction welding system and method for adjusting pressure. Background Art

[0002] Inertia friction welding technology is an important connection method for axisymmetric parts such as pipes and bars in the current equipment manufacturing industry. It has the advantages of low heat input and few welding defects, and can achieve effective connection between homogeneous or heterogeneous metals. Its typical welding process is: before welding begins, the main motor is connected to the spindle and flywheel group through the clutch and drives it and the workpiece it holds to rotate, storing kinetic energy in the rotating flywheel group and the spindle. When the speed of the spindle and flywheel group reaches the set value, the main motor is disengaged from the flywheel group and the spindle, and the welding process begins. The servo feed assembly drives the tailstock and its clamped workpiece to move axially until it contacts the rotating workpiece. Under the action of friction pressure and torque, the kinetic energy stored in the spindle and flywheel group will be converted into heat energy at the friction interface of the workpiece, heating the workpiece to a thermoplastic state, and gradually extruding it to form a flash under the continuous action of friction pressure until the kinetic energy of the spindle and flywheel group is exhausted and stops rotating. After a certain period of pressure maintenance, the pressure is removed and the welding is completed. Inertia friction welding technology mainly includes three welding parameters: moment of inertia, initial speed and friction pressure. The moment of inertia is determined by the spindle and flywheel assembly and cannot be changed after the welding process begins. The initial speed depends on the set value before welding begins, and the speed decay during welding is spontaneous and cannot be directly controlled. The friction pressure is applied by the hydraulic system on the feed side and can be changed during the welding process.

[0003] A Chinese patent (publication number CN 108637464 A) discloses an inertia friction welding device, which sets and controls the pressure of the power pump group and the first-level pressure proportional adjustment output, the speed of the power device, detects the parameters during the welding process, and reads and stores the welding data during the welding process through a PLC control unit; the high-speed controller I is connected to the second-level pressure servo proportional adjustment output in the hydraulic system to adjust the pressure of the hydraulic balance piston of the top forging cylinder and the main shaft in the host system, and can control the time of the welding process; however, after the welding starts, there is a lack of effective control measures. For some special materials or thin-walled structural parts, the large "post-peak" torque near the end of welding is easy to cause unstable deformation, flash cracking, etc., which has an adverse effect on the welding quality. The above problems lead to the need for a large number of trial and error tests to explore suitable process parameters in the development of inertia friction welding process, consume a large amount of test materials, and increase the cost of process development; welding instability deformation will reduce the yield rate, cause waste of production materials and increase production costs, and limit the promotion and application of inertia friction welding technology. Summary of the invention

[0004] The purpose of the present invention is to provide an inertia friction welding system and method for adjusting pressure in response to the defects of the prior art. The system and method utilize strain gauges and temperature monitors to obtain the torque of the workpieces to be welded and the temperature of the welding friction interface during the welding process, and use a servo feed assembly to adjust the pressure between the workpieces to be welded, thereby accurately controlling the pressure and temperature during the welding process and effectively reducing quality problems such as unstable deformation and flash cracking.

[0005] The first object of the present invention is to provide an inertia friction welding system with regulated pressure, which adopts the following scheme:

[0006] include:

[0007] The inertia friction welding machine comprises a flywheel assembly and a tailstock which are arranged relatively, the flywheel assembly and the tailstock are respectively provided with a clamping assembly, the flywheel assembly is connected to a rotating driving element through a clutch, and the tailstock is connected to a servo feeding assembly;

[0008] The control component includes a controller, a strain gauge, and a temperature monitor. The strain gauge is provided with an application surface for being attached to the workpiece to be welded corresponding to the tailstock, and can measure the strain data of the workpiece to be welded and send it to the controller; the monitoring area of ​​the temperature monitor covers the welding area of ​​the workpiece to be welded, and can send the temperature of the welding area to the controller; the controller is used to control the servo feed component to adjust the pressure between the workpieces to be welded.

[0009] Furthermore, the clamping assembly on the flywheel assembly forms a first clamping portion, and the clamping assembly on the tailstock forms a second clamping portion, and the first clamping portion and the second clamping portion are coaxially distributed.

[0010] Furthermore, the inertia friction welding machine also includes a workbench, on which a guide rail parallel to the movement direction of the servo feed assembly is provided, and the tailstock cooperates with the guide rail to be slidably mounted on the workbench.

[0011] Furthermore, the strain gauge is connected to the controller via a strain-type torque measuring instrument, and the temperature monitor is an infrared temperature monitor.

[0012] Furthermore, the output end of the rotating driving element is connected to the input end of the clutch through a driving shaft, and the output end of the clutch is connected to the flywheel assembly through a rotating main shaft.

[0013] Furthermore, the rotary drive element and the clutch are respectively connected to a controller, and the controller is used to control the operating parameters of the rotary drive element and the working state of the clutch.

[0014] Furthermore, the servo feed assembly includes a hydraulic push rod, one end of which is fixed to the inertia friction welding machine, and the other end of which is connected to the tailstock to drive the tailstock to move relative to the flywheel assembly.

[0015] A second object of the present invention is to provide a working method of the inertia friction welding system with pressure adjustment as described in the first object, comprising:

[0016] The clamping assembly on the flywheel assembly and the clamping assembly on the tailstock respectively clamp the workpiece to be welded, the application surface of the strain gauge is pasted on the workpiece to be welded corresponding to the tailstock, and the temperature monitor monitors the temperature of the friction interface of the workpiece to be welded;

[0017] Start the rotating drive element, thereby driving the clamping assembly on the flywheel assembly and the workpiece to be welded to rotate. When the speed reaches the required speed, use the clutch to cut off the power between the rotating drive element and the workpiece to be welded;

[0018] The servo feed assembly pushes the tailstock and the clamped workpiece to be welded to move, so that the two workpieces to be welded are in contact and pressure is applied;

[0019] The temperature monitor continuously collects the temperature of the friction interface of the workpiece to be welded and sends it to the controller, and the strain gauge measures the strain data of the workpiece to be welded and sends it to the controller;

[0020] The controller controls the pressure applied by the servo feed assembly between the workpieces to be welded based on the monitoring data of the temperature monitor and / or the strain gauge, so that the joints of the workpieces to be welded are fully welded.

[0021] Furthermore, a target temperature range of the friction interface is preset, and the servo feed assembly is controlled to increase, decrease or maintain the pressure applied between the workpieces to be welded, so that the temperature of the friction interface is maintained within the target temperature range.

[0022] Furthermore, a target torque range of the workpiece to be welded is preset, the real-time torque collected by the strain gauge is compared with the target torque range, and the servo feed assembly is controlled to keep the real-time torque within the target torque range.

[0023] Compared with the prior art, the present invention has the following advantages and positive effects:

[0024] (1) Due to improper control of welding pressure and temperature, cracks and flash may appear in the welding area. Especially at the end of welding, the "post-peak" torque is large, which may easily cause the workpiece to become unstable and deformed. A temperature monitor and a strain gauge are used to obtain the temperature of the welding friction interface and the torque of the workpiece to be welded during the welding process, and a servo feed assembly is used to adjust the pressure between the workpieces to be welded. The temperature monitor can be used to monitor the temperature of the inertial friction welding process, and the friction pressure can be adjusted to avoid the deterioration of the microstructure caused by excessive welding temperature, thereby improving the quality of the welded joint. The strain gauge can be used to monitor the torque of the inertial friction welding process, and the friction pressure can be adjusted to avoid excessive "post-peak" torque, prevent instability and deformation, improve welding forming, and effectively reduce quality problems such as instability and deformation and flash cracking.

[0025] (2) Based on the temperature and torque monitoring data, the controller can automatically adjust the friction pressure of the inertia friction welding process without destroying or changing the original mechanical structure of the inertia friction welding machine. By adding external equipment and integrating data processing and control programs, the friction torque, friction heat generation rate and welding time can be changed by adjusting the friction pressure of the welding process, thereby improving welding forming, improving welding quality, and reducing the cost of inertia friction welding process development and application. It is simple to operate and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 Schematic diagram of an inertia friction welding system for adjusting pressure in Examples 1 and 2 of the present invention.

[0028] Among them, 1. workbench; 2. rotating drive motor; 3. driving shaft; 4. clutch; 5. rotating spindle; 6. flywheel assembly; 7. clamping assembly; 8. tailstock; 9. hydraulic push rod; 10. servo feed assembly; 11. guide rail; 12. controller; 13. strain gauge; 14. strain type torque meter; 15. infrared temperature monitor; 16. workpiece to be welded. DETAILED DESCRIPTION

[0029] Example 1

[0030] In a typical embodiment of the present invention, Figure 1 As shown, an inertia friction welding system with regulated pressure is provided.

[0031] After welding begins, there is a lack of effective control measures. For some special materials or thin-walled structural parts, the larger "post-peak" torque near the end of welding can easily cause unstable deformation, flash cracking, etc., which have an adverse effect on the welding quality. Based on this, a pressure-adjustable inertial friction welding system is provided in this embodiment, which improves the welding quality and yield rate, and reduces the process development cost and production material waste by accurately controlling the pressure and temperature during the welding process.

[0032] like Figure 1As shown, the inertial friction welding system for adjusting pressure includes an inertial friction welding machine and a control component, wherein the inertial friction welding machine is a workbench 1, on which a rotary drive element, a clutch 4, a flywheel assembly 6, a tailstock 8, a servo feed assembly 10 and a guide rail 11 are arranged. The flywheel assembly 6 is connected to the rotary drive element through the clutch 4 for storing and releasing rotational kinetic energy. A clamping assembly 7 is provided on the flywheel assembly 6, and the clamping assembly 7 forms a first clamping portion. The tailstock 8 is arranged opposite to the flywheel assembly 6 and is used to clamp the other end of the workpiece 16 to be welded. The tailstock 8 is also provided with a clamping assembly 7 to form a second clamping portion. The first clamping portion and the second clamping portion are coaxially distributed, they are on the same straight line, and the center points coincide, which helps to ensure that the clamped workpiece maintains a stable coaxiality during the welding process. The servo feed assembly 10 is connected to the tailstock 8 for accurately controlling the relative position and pressure between the workpieces 16 to be welded. The direction of the guide rail 11 is parallel to the movement direction of the servo feed assembly 10, so that the movement direction of the workpiece 16 to be welded clamped by the tailstock 8 and the clamping assembly 7 thereon meets the requirements of inertia friction welding. The tailstock 8 cooperates with the guide rail 11 and is installed on the workbench 1 in a sliding manner. The tailstock 8 performs linear motion on the workbench 1, thereby adjusting the distance between it and the flywheel assembly 6.

[0033] The control component includes a controller 12, a strain gauge 13, and a temperature monitor. The controller 12 is the core of the system and is responsible for receiving sensor data and issuing control instructions. The strain gauge 13 is attached to the application surface of the workpiece 16 to be welded corresponding to the tailstock 8, and is used to measure the strain data of the workpiece 16 to be welded to reflect the deformation of the workpiece. The monitoring area of ​​the temperature monitor covers the welding area of ​​the workpiece 16 to be welded, and obtains the temperature information of the welding area in real time.

[0034] The strain gauge 13 is connected to the controller 12 through the strain torque meter 14. The strain gauge 13 is used to monitor the torque changes generated during the welding process, thereby reflecting the welding status. The temperature monitor uses an infrared temperature monitor 15, which is also connected to the controller 12. The infrared temperature monitor 15 can monitor the temperature changes of the welding area in real time in a non-contact manner to ensure that the welding process is carried out within a safe and controllable range.

[0035] Specifically, Figure 1 As shown, the infrared temperature monitor 15 is arranged beside the friction interface, so that the friction interface during welding appears within the monitoring range of the infrared detector, and is effectively connected to the controller 12. The infrared temperature monitor 15 can select an area and output the temperature data of the area. The infrared temperature monitor 15 should ensure that the central axis and the friction interface are in the same plane. The strain type torque meter 14 is arranged beside the feed side workpiece and is effectively connected to the controller 12. The strain gauge 13 is pasted on the outer cylindrical surface of the unclamped part of the feed side workpiece and is effectively connected to the strain type torque meter 14.

[0036] In this embodiment, the controller 12 integrates a data processing and control program, and controls the servo feed assembly 10 on the feed side to adjust the friction pressure of the welding process after processing the collected temperature and torque data through the data processing and control program.

[0037] The output end of the rotary drive element is connected to the input end of the clutch 4 through the drive shaft 3, and the output end of the clutch 4 is connected to the flywheel group 6 through the rotating main shaft 5. The controller 12 accurately controls the rotation speed of the flywheel group 6 by controlling the working state of the rotary drive element and the clutch 4. The rotary drive element can be an electric motor, a hydraulic motor, etc., and according to specific needs, a DC motor, an AC motor, a servo motor or a stepper motor can be selected. The clutch 4 can be an electromagnetic clutch, a pneumatic clutch or a hydraulic clutch. The servo feed assembly 10 is mainly composed of a hydraulic push rod 9, a fixing device, a connecting piece and a control system. One end of the hydraulic push rod 9 is fixed on the inertia friction welding machine, and the other end is connected to the tailstock 8. Through collaborative work, it is ensured that the tailstock 8 can move smoothly and accurately relative to the flywheel group 6, so as to adjust the gap and contact pressure between the workpieces. The hydraulic push rod 9 is the core component of the servo feed assembly 10, which uses the hydraulic principle to realize telescopic movement. The hydraulic push rod 9 is usually composed of a cylinder body, a piston, a seal and a guide device. The cylinder is filled with hydraulic oil. When the piston is under pressure, it will reciprocate in the cylinder, thereby driving the parts connected to it to move.

[0038] Among them, the control system of the servo feed assembly 10 is responsible for receiving instructions from the controller 12 and controlling the telescopic movement of the hydraulic push rod 9. The control system is usually composed of a solenoid valve, a sensor, a controller 12 and a power supply. The solenoid valve is used to control the flow direction and flow rate of the hydraulic oil, thereby achieving precise control of the telescopic speed and displacement of the hydraulic push rod 9. The sensor is used to monitor parameters such as the position and speed of the hydraulic push rod 9 in real time, and feed this information back to the controller 12. The controller 12 calculates the gap and contact pressure that need to be adjusted based on this information and the preset welding parameters, and issues corresponding control instructions.

[0039] By designing the first clamping part and the second clamping part to be coaxially distributed, the coaxiality of the clamped workpiece during the welding process is ensured, and the welding quality and stability are improved. Through the precise control of the rotary drive element, the clutch 4 and the servo feed assembly 10 by the controller 12, the precise adjustment of the rotation speed of the flywheel group 6 and the moving distance of the tailstock 8 is achieved, thereby improving the controllability and accuracy of the welding process. Through the real-time monitoring of the strain gauge 13 and the infrared temperature monitor 15, abnormal conditions in the welding process, such as excessive torque, excessive temperature, etc., can be discovered in time, thereby avoiding the occurrence of welding defects and safety accidents.

[0040] Example 2

[0041] In another typical embodiment of the present invention, Figure 1 As shown, a working method of an inertia friction welding system with adjusted pressure is provided, using the inertia friction welding system with adjusted pressure as in Example 1.

[0042] A method for operating a pressure-regulated inertia friction welding system, comprising:

[0043] The clamping assembly 7 on the flywheel assembly 6 and the clamping assembly 7 on the tailstock 8 respectively clamp the workpiece 16 to be welded, the application surface of the strain gauge 13 is pasted on the workpiece 16 to be welded corresponding to the tailstock 8, and the temperature monitor monitors the temperature of the friction interface of the workpiece 16 to be welded;

[0044] The rotating driving element is started to drive the clamping assembly 7 on the flywheel assembly 6 and the workpiece 16 to be welded. When the rotation speed reaches the required speed, the clutch 4 is used to cut off the power between the rotating driving element and the workpiece 16 to be welded.

[0045] The servo feed assembly 10 pushes the tailstock 8 and the clamped workpiece 16 to be welded to move, so that the two workpieces 16 to be welded are in contact and pressure is applied;

[0046] The temperature monitor continuously collects the temperature of the friction interface of the workpiece 16 to be welded and sends it to the controller 12 , and the strain gauge 13 measures the strain data of the workpiece 16 to be welded and sends it to the controller 12 ;

[0047] The controller 12 controls the pressure applied between the workpieces 16 to be welded by the servo feed assembly 10 according to the monitoring data of the temperature monitor and / or the strain gauge 13 , so that the joints of the workpieces 16 to be welded are fully welded.

[0048] The target temperature range of the friction interface is preset, and the servo feed assembly 10 is controlled to increase, decrease or maintain the pressure applied between the workpieces 16 to be welded, so that the temperature of the friction interface is maintained within the target temperature range.

[0049] The target torque range of the workpiece 16 to be welded is preset, the real-time torque collected by the strain gauge 13 is compared with the target torque range, and the servo feed assembly 10 is controlled to keep the real-time torque within the target torque range.

[0050] Specific, combined Figure 1 , the working method of the inertia friction welding system with regulated pressure includes:

[0051] An infrared temperature monitor 15 is arranged next to the friction interface so that the friction interface during welding appears within the monitoring range of the infrared detector. A strain-type torque meter 14 is arranged next to the workpiece on the feed side, and a strain gauge 13 is pasted on the outer cylindrical surface of the unclamped part of the workpiece on the feed side. The inertial friction welding machine is controlled by a controller 12 to start working. The infrared temperature monitor 15 and the strain-type torque meter 14 transmit the obtained temperature and torque data to the controller 12, which controls the servo feed assembly 10 to adjust the friction pressure during the welding process after data processing and control program processing.

[0052] Before welding starts, the target temperature is set in the data processing and control program, and the monitoring area including the friction interface is selected in the infrared temperature monitor 15. After welding starts, the infrared temperature monitor 15 continuously collects and sends temperature data to the controller 12. The data processing and control program compares the collected temperature with the target temperature. When the collected temperature is higher than the target temperature, the servo feed assembly 10 is controlled to reduce the friction pressure. When the collected temperature is lower than the target temperature, the servo feed assembly 10 is controlled to increase the friction pressure to a preset value. The above monitoring and adjustment process is repeated until the welding is completed.

[0053] Before welding starts, the target torque is set in the data processing and control program. After welding starts, the strain-type torque meter 14 continuously collects and sends torque data to the controller 12. The data processing and control program compares the collected torque with the target torque. When the collected torque is greater than the target torque, the servo feed assembly 10 is controlled to reduce the friction pressure. When the collected torque is less than the target torque, the servo feed assembly 10 is controlled to increase the friction pressure to a preset value. The above monitoring and adjustment process is repeated until the welding is completed.

[0054] During the inertia friction welding process, when the friction interface temperature is too high, the metal near the interface will experience microstructural deterioration such as grain coarsening and dissolution of strengthening phases, which will reduce the joint performance. At the same time, the deformation resistance of overheated metal will decrease significantly, and unstable deformation will easily occur, affecting the joint forming. Frictional heat generation accounts for the vast majority of the heat generated during the inertia friction welding process and is the main factor in heating the workpiece. The frictional heat generation power P is related to the relative speed v and the friction force f, P = vf, and the friction force f is proportional to the normal pressure fn, f = μfn, which is proportional to the friction pressure p in inertia friction welding. Therefore, adjusting the friction pressure p can change the frictional heat generation power of the friction interface. When the friction interface temperature is too high, reducing the friction pressure can reduce the frictional heat generation power. When the interface heat generation power is less than the workpiece heat conduction, heat convection and heat radiation loss power, the interface temperature will drop, thereby avoiding excessive workpiece temperature from damaging the joint forming and performance.

[0055] In addition, during the inertia friction welding process, after the material reaches the thermoplastic state, the deformation resistance decreases. For some special materials and thin-walled structures, unstable deformation is prone to occur under the action of large friction torque, affecting the welding forming and quality. The friction torque M is proportional to the friction force f, so adjusting the friction pressure can change the friction force and interface friction torque. When the friction torque is detected to be too large, the friction pressure can be reduced to reduce the friction force and friction torque to prevent unstable deformation.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inertia friction welding system with adjustable pressure, characterized in that: include: The inertia friction welding machine comprises a flywheel assembly and a tailstock which are arranged relatively, the flywheel assembly and the tailstock are respectively provided with a clamping assembly, the flywheel assembly is connected to a rotating driving element through a clutch, and the tailstock is connected to a servo feeding assembly; The control component includes a controller, a strain gauge, and a temperature monitor. The strain gauge is provided with an application surface for being attached to the workpiece to be welded corresponding to the tailstock, and can measure the strain data of the workpiece to be welded and send it to the controller; the monitoring area of ​​the temperature monitor covers the welding area of ​​the workpiece to be welded, and can send the temperature of the welding area to the controller; the controller is used to control the servo feed component to adjust the pressure between the workpieces to be welded.

2. The pressure-regulated inertia friction welding system according to claim 1, characterized in that: The clamping assembly on the flywheel assembly forms a first clamping portion, and the clamping assembly on the tailstock forms a second clamping portion, and the first clamping portion and the second clamping portion are coaxially distributed.

3. The pressure-regulated inertia friction welding system according to claim 2, characterized in that: The inertia friction welding machine also includes a workbench, on which a guide rail parallel to the moving direction of the servo feed assembly is arranged, and the tailstock cooperates with the guide rail to be slidably mounted on the workbench.

4. The pressure-regulated inertia friction welding system according to claim 1, characterized in that: The strain gauge is connected to the controller through a strain type torque measuring instrument, and the temperature monitor is an infrared temperature monitor.

5. The pressure-regulated inertia friction welding system according to claim 1, characterized in that: The output end of the rotating driving element is connected to the input end of the clutch through the driving shaft, and the output end of the clutch is connected to the flywheel assembly through the rotating main shaft.

6. The pressure-regulated inertia friction welding system according to claim 5, characterized in that: The rotary drive element and the clutch are respectively connected to a controller, and the controller is used to control the operating parameters of the rotary drive element and the working state of the clutch.

7. The pressure-regulated inertia friction welding system of claim 1, wherein: The servo feed assembly comprises a hydraulic push rod, one end of which is fixed on the inertia friction welding machine, and the other end of which is connected to the tailstock to drive the tailstock to move relative to the flywheel assembly.

8. A method for operating a pressure-adjustable inertia friction welding system, using the pressure-adjustable inertia friction welding system as claimed in any one of claims 1 to 7, characterized in that: include: The clamping assembly on the flywheel assembly and the clamping assembly on the tailstock respectively clamp the workpiece to be welded, the application surface of the strain gauge is pasted on the workpiece to be welded corresponding to the tailstock, and the temperature monitor monitors the temperature of the friction interface of the workpiece to be welded; Start the rotating drive element, thereby driving the clamping assembly on the flywheel assembly and the workpiece to be welded to rotate. When the speed reaches the required speed, use the clutch to cut off the power between the rotating drive element and the workpiece to be welded; The servo feed assembly pushes the tailstock and the clamped workpiece to be welded to move, so that the two workpieces to be welded are in contact and pressure is applied; The temperature monitor continuously collects the temperature of the friction interface of the workpiece to be welded and sends it to the controller, and the strain gauge measures the strain data of the workpiece to be welded and sends it to the controller; The controller controls the pressure applied by the servo feed assembly between the workpieces to be welded based on the monitoring data of the temperature monitor and / or the strain gauge, so that the joints of the workpieces to be welded are fully welded.

9. The operating method of the pressure-adjustable inertia friction welding system according to claim 8, characterized in that: The target temperature range of the friction interface is preset, and the servo feed assembly is controlled to increase, decrease or maintain the pressure applied between the workpieces to be welded, so that the temperature of the friction interface is maintained within the target temperature range.

10. The operating method of the pressure-adjustable inertia friction welding system according to claim 8, characterized in that: The target torque range of the workpiece to be welded is pre-set, the real-time torque collected by the strain gauge is compared with the target torque range, and the servo feed assembly is controlled to keep the real-time torque within the target torque range.

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