A flash butt welding machine control system for welding titanium alloy bars and a method of using the same

Abstract

The application belongs to the technical field of non-ferrous metal processing equipment, and particularly discloses a flash butt welding machine control system for titanium alloy bar welding and a use method thereof. The control system comprises a man-machine interface, which is connected with a welding heat control unit and a mechanism action control unit through a PLC controller respectively, and the welding operation of the titanium alloy bar is realized through the coordinated linkage of the two. The welding heat control unit is divided into a flash establishment stage P1, a stable heating stage P2 and a stamping welding stage P3, and the current and duration of each stage can be set on the man-machine interface. The heat is controlled by a silicon controlled circuit board and two anti-parallel thyristors. The mechanism action control unit comprises a bar clamping cylinder and other components, and each component is connected with the PLC controller. The application can accurately control the heat, improve the butt welding success rate and the welding quality, and the equipment is programmed to run safely and reliably, thereby providing an efficient, stable and safe solution for the welding of titanium alloy bars of different specifications.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of non-ferrous metal processing equipment, and particularly relates to a flash butt welding machine control system for titanium alloy bar welding and a use method thereof. BACKGROUND

[0002] Titanium alloy materials are widely used in many fields such as aerospace, marine engineering and medical devices due to their high strength, low density, excellent corrosion resistance and biocompatibility. In the production process of titanium alloy products, the welding of bar materials is a key link, and the welding quality directly affects the performance and reliability of the final product.

[0003] Among them, the flash butt welding machine is widely used for longitudinal connection of bar materials. Its working principle is to use the contact of the bar materials at both ends of the electrode of the butt welding machine, and through low-voltage and large-current, the bar materials are heated to a certain temperature after softening, and then axial pressing and upsetting are performed to form a butt joint. It has the advantages of fast welding speed and relatively simple welding process. However, our company found in long-term use that the traditional flash butt welding machine has poor titanium alloy bar welding effect, especially the low success rate of titanium alloy welding of different specifications. The reasons are as follows:

[0004] First, the heat control is not accurate: in the welding process of the traditional flash butt welding machine, it is difficult to accurately control the welding heat according to the special physical and chemical properties of the titanium alloy bar material. Titanium alloy has high melting point, low thermal conductivity and strong chemical activity, which requires strict heat input during the welding process. In the welding of titanium alloy bars of different specifications, it is necessary to accurately adjust the heat at each stage of the welding process (such as flash establishment, stable heating and stamping welding stage). However, the traditional welding machine lacks effective means to realize such accurate heat control, which leads to the easy occurrence of overheating or insufficient heat at the welded joint, thereby affecting the quality of the weld, such as coarse grain, incomplete fusion, porosity, cracks and other defects in the weld, and reducing the success rate of butt welding of titanium alloy bars;

[0005] Second, the safety of the equipment is low: the mechanism motion control of the traditional flash butt welding machine is relatively simple, and there are safety hazards in the aspects of bar clamping, electrode clamp feeding and welding area protection during the welding process. For example, when clamping the material, the operator is easy to be touched by mistake due to the lack of effective protection and accurate control, causing burns or mechanical injuries; during the welding process, the running state of the equipment is unstable, and the equipment failure may be caused by unexpected situations, which not only affects the production efficiency, but also may cause more serious safety accidents, increasing the production risk and cost of the enterprise.

[0006] Third, inconvenient operation and lack of flexibility: the operation interface and control system of the traditional welding machine are not intelligent enough, and cannot quickly and accurately set the welding parameters according to titanium alloy bars of different specifications. The operator needs to adjust the welding current, time and other parameters based on experience and multiple tests, which not only consumes time and effort, but also is difficult to ensure the consistency and stability of each welding. At the same time, during the welding process, it is difficult to monitor the temperature, current and other key parameters of the welding area in real time, and it is difficult to adjust and optimize the welding process in time, which cannot meet the needs of modern industrial production for efficient and high-quality welding.

[0007] In summary, the existing flash butt welding machine has the above problems in the welding of titanium alloy bars, which seriously restricts the wide application and further development of titanium alloy materials in various fields, and therefore a new flash butt welding machine control system specially for the welding of titanium alloy bars is urgently needed to solve these problems.

[0008] Therefore, the present application is proposed. SUMMARY

[0009] The purpose of the present application is to overcome the shortcomings of the prior art and provide a flash butt welding machine control system for welding titanium alloy bars and a method for using the same, which is mainly used to solve the problems of inaccurate heat control, low equipment safety and inconvenient operation and lack of flexibility of traditional flash butt welding machines, resulting in poor welding quality of titanium alloy bars of different specifications, low production efficiency and frequent safety accidents.

[0010] The purpose of the present application is achieved by the following technical solutions:

[0011] In a first aspect, the present application provides a flash butt welding machine control system for welding titanium alloy bars, which comprises a human-machine interface, the human-machine interface is connected with a welding heat control unit and a mechanism action control unit through a PLC controller, and the welding heat control unit and the mechanism action control unit are cooperatively linked through the PLC controller for welding operation of the titanium alloy bars.

[0012] The welding heat control unit is divided into the following three stages when controlling heat: the first stage is a flash establishment stage P1, the second stage is a stable heating stage P2, and the third stage is a stamping welding stage P3. The corresponding durations of P1, P2 and P3 are T1, T2 and T3 respectively, and the current size and duration of each stage are set through the human-machine interface.

[0013] Further, the welding heat control unit comprises a silicon controlled rectifier control circuit board, a first thyristor and a second thyristor, the first thyristor and the second thyristor are connected with the silicon controlled rectifier control circuit board respectively, the silicon controlled rectifier control circuit board is connected with the PLC controller, and the silicon controlled rectifier control circuit board outputs continuous analog signals to adjust the conduction angle of the first thyristor and the second thyristor according to the control instruction signal of the PLC controller, so as to control the current size of each stage during welding.

[0014] Further, the first thyristor and the second thyristor are connected in anti-parallel.

[0015] Further, the silicon controlled rectifier control circuit board is a PAC16P single-phase phase-shifting voltage regulation board.

[0016] Further, the first thyristor and the second thyristor are both flat plate structures, and the model is KP500A, 1600V.

[0017] Further, the mechanism action control unit comprises a bar clamping air cylinder, an electrode clamp and a feeding oil cylinder.

[0018] The electrode clamp and the feeding oil cylinder are both arranged on the base body, the bar clamping air cylinder is arranged directly above the electrode clamp, is used for providing clamping force to the titanium alloy bar located on the electrode clamp, the feeding oil cylinder is located on one side of the electrode clamp, the piston rod end of the feeding oil cylinder is fixedly connected with the side wall of the electrode clamp, and the feeding oil cylinder is used for controlling the feeding of the electrode clamp during welding.

[0019] Further, the mechanism action control unit further comprises a welding guard plate and a limit switch arranged on the base body, and the limit switch is used for detecting the position of the welding guard plate.

[0020] Further, the bar clamping air cylinder, the electrode clamp, the feeding oil cylinder, the welding guard plate and the limit switch are all connected with the PLC controller.

[0021] Further, the human-computer interface mainly comprises a parameter setting area, an action start-stop button, a heating current monitoring part, a welding area temperature detection part and an over-temperature alarm part, and the current size and the duration of each stage are set through the parameter setting area of the human-computer interface.

[0022] In the second aspect, the application provides a use method of the flash butt welding machine control system for the titanium alloy bar welding.

[0023] Step 1, parameter setting: according to the specification of the titanium alloy bar to be welded, the heat required by each stage is determined, and then the current size and the duration of each stage are set in the human-computer interface according to the heat required by each stage.

[0024] Step 2, clamp material: after step 1) is completed, the welding shield of the mechanism action control unit is opened by the PLC controller, the titanium alloy bar to be welded is placed in the material clamping area, the bar clamping cylinder of the mechanism action control unit is controlled to extend, the electrode clamp clamps the titanium alloy bar, then the welding shield is closed, and after the limit switch of the mechanism action control unit detects that the welding shield is closed in place, the first thyristor and the second thyristor start to discharge by the welding heat control unit of the PLC controller, enter the flash establishing stage P1, the bar welding part is heated according to the set current, and after the duration T1 of the P1 stage ends, the electrode clamp is fed at a uniform speed by the feeding oil cylinder of the mechanism action control unit, and the first thyristor and the second thyristor discharge according to the current set in the stable heating stage P2, when the duration T2 of the P2 stage ends, the feeding oil cylinder reaches the stamping welding area, the first thyristor and the second thyristor discharge according to the current set in the stamping welding stage P3, the feeding oil cylinder continues to advance uniformly, when the duration T3 of the P3 stage ends, the stamping welding operation is completed, at this time, the welding shield is opened by the PLC controller, and the bar clamping cylinder and the feeding oil cylinder are reset, and the whole welding process is completed.

[0025] Step 3, welding: after step 2) is completed, the first thyristor and the second thyristor start to discharge by the welding heat control unit of the PLC controller, enter the flash establishing stage P1, the bar welding part is heated according to the set current, and after the duration T1 of the P1 stage ends, the electrode clamp is fed at a uniform speed by the feeding oil cylinder of the mechanism action control unit, and the first thyristor and the second thyristor discharge according to the current set in the stable heating stage P2, when the duration T2 of the P2 stage ends, the feeding oil cylinder reaches the stamping welding area, the first thyristor and the second thyristor discharge according to the current set in the stamping welding stage P3, the feeding oil cylinder continues to advance uniformly, when the duration T3 of the P3 stage ends, the stamping welding operation is completed, at this time, the welding shield is opened by the PLC controller, and the bar clamping cylinder and the feeding oil cylinder are reset, and the whole welding process is completed.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] The flash butt welding machine control system provided by the present application is mainly composed of a man-machine interface, a PLC controller, a welding heat control unit and a mechanism action control unit, and the welding heat control unit and the mechanism action control unit are both controlled by the PLC controller to realize cooperative linkage control and execute the welding indexes input by the man-machine interface. The welding heat control unit is connected with two anti-parallel thyristor elements through a silicon controlled circuit board, can accurately and stably control the heat of three stages (the flash establishing stage P1, the stable heating stage P2 and the stamping welding stage P3) in the butt welding process of titanium alloy bars of different specifications, successfully overcomes the difficulty of the traditional flash butt welding machine in adapting to the welding of titanium alloy bars of different specifications, greatly improves the butt welding success rate of the titanium alloy bars, especially the welding quality is obviously improved, and a good foundation is laid for subsequent processing; meanwhile, the control system improves the safety of the equipment from multiple aspects, not only accurately controls the welding shield, the bar clamping cylinder and the feeding oil cylinder and the like, eliminates the safety hazards caused by accidental touch and misoperation from the source, but also effectively reduces the equipment failure and the loss caused thereby on the basis of ensuring the production safety, plays a key role in improving the welding quality and ensuring the production safety, and brings a new solution of high efficiency, stability and safety for the titanium alloy bar welding production. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate the principles of the application, and, together with the description, serve to explain the application.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0030] Figure 1 is a schematic diagram of the control system of the flash butt welding machine for titanium alloy bar welding of the present application;

[0031] Figure 2 is a schematic diagram of the mechanism action control unit structure in the control system of the present application;

[0032] Figure 3 is a flowchart of the use method of the flash butt welding machine control system of the present application.

[0033] Among them:

[0034] 1 is a human-machine interface;

[0035] 2 is a PLC controller;

[0036] 3 is a welding heat control unit; 31 is a silicon controlled rectifier control circuit board; 32 is a first thyristor; 33 is a second thyristor;

[0037] 4 is a mechanism action control unit; 41 is a bar clamping cylinder; 42 is an electrode clamp; 43 is a feeding oil cylinder; 44 is a welding shield plate; 45 is a limit switch. DETAILED DESCRIPTION

[0038] The exemplary embodiments will be described in detail herein below with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatuses consistent with some aspects of the present application as detailed in the appended claims.

[0039] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0040] Please refer to Figures 1-2The flash butt welding machine control system for titanium alloy bar welding provided by the embodiment of the application comprises a man-machine interface 1, the man-machine interface 1 is connected with a welding heat control unit 3 and a mechanism action control unit 4 respectively through a PLC controller 2. In actual operation, the welding heat control unit 3 and the mechanism action control unit 4 realize a highly coordinated linkage operation mechanism under the accurate regulation of the PLC controller 2, and this mechanism can accurately and efficiently execute various instructions, thereby realizing the welding operation of titanium alloy bars A of different specifications.

[0041] In the embodiment of the application, the man-machine interface 1 mainly comprises a parameter setting area, an action start-stop button, a heating current monitoring part, a welding area temperature detection part and an over-temperature alarm part.

[0042] Specifically, in the embodiment of the application, the welding heat control unit 3 is the core of the entire control system, and when controlling heat, it is divided into the following three stages: the first stage is a flash establishment stage P1, which mainly realizes the rapid heating of the welding part by applying a relatively large current to the bar for a short time to form a spark current--flash, thereby establishing a welding part heating loop; the second stage is a stable heating stage P2, which mainly realizes the heating of the bar by continuously applying a relatively small current to the bar for a long time, so that the temperature of the bar in this area reaches the specified welding temperature; the third stage is a stamping welding stage P3, which mainly realizes the welding function by applying a relatively large current to the bar for a short time to make the bars extrude each other under the condition of top forging; in addition, the corresponding durations of the three stages P1, P2 and P3 are set as T1, T2 and T3 respectively. It is worth noting that in the entire welding process, the current size and duration required by each stage can be accurately set through the parameter setting area of the man-machine interface 1. Since in the actual welding scene, the voltage is usually constant, according to the Joule law (Q=I 2 RT, where Q represents heat, I is current, R is resistance, and T is time), under the condition of constant resistance and voltage, by accurately controlling the current size and duration of each stage, the total amount of heat released by each stage can be accurately controlled, thereby realizing fine and accurate control of the welding process, ensuring that the welding quality meets the expected standard, and meeting the stringent requirements of titanium alloy bar welding of different specifications for heat.

[0043] In the embodiment of the present application, the welding heat control unit 3 comprises a silicon controlled rectifier control circuit board 31, a first thyristor 32 and a second thyristor 33, the first thyristor 32 and the second thyristor 33 are connected with the silicon controlled rectifier control circuit board 31 respectively, the silicon controlled rectifier control circuit board 31 is connected with the PLC controller 2, and the silicon controlled rectifier control circuit board 31 outputs a continuous analog signal to adjust the conduction angle of the first thyristor 32 and the second thyristor 33 according to the control instruction signal of the PLC controller 2, so as to control the current size of each stage during welding.

[0044] Specifically, the first thyristor 32 and the second thyristor 33 both adopt a flat plate structure, and the model thereof is KP500A, 1600V. The selection of this model is based on the comprehensive consideration of the current carrying capacity and voltage stability during welding. In particular, the first thyristor 32 and the second thyristor 33 adopt an anti-parallel connection mode. After this connection, when the system is running, the welding current size can be accurately adjusted by adjusting the conduction angle of each thyristor, and then a complete and accurate heat control system is formed according to the pre-set duration of each stage. In this way, the welding heat control unit 3 can stably and accurately output the heat suitable for the welding process requirements of the titanium alloy bar in the flash establishment stage P1, the stable heating stage P2 and the stamping welding stage P3, thereby fundamentally guaranteeing the welding quality of the titanium alloy bar.

[0045] Among them, the silicon controlled rectifier control circuit board 31 selects a PAC16P single-phase phase-shifting voltage regulating board, which can output a continuous analog signal. The signal directly acts on the thyristor, which is used to accurately adjust the conduction angle of the thyristor, and then realizes the accurate control of the welding current size of the welding machine. In addition, the trigger pulse analog signal output by the silicon controlled rectifier control circuit board 31 has high symmetry and stability, and does not change with the environment temperature. In use, the pulse symmetry and limit do not need to be adjusted, and at the same time, it also has a perfect multi-way protection system such as overcurrent, overvoltage, current limiting and voltage limiting. Once a fault occurs, the protection system can act in a short time to reliably protect the thyristor.

[0046] In the embodiment of the present application, the PLC controller 2 should be able to output a 4-20mA analog current signal, thereby realizing the stable control of the trigger circuit of the silicon controlled rectifier control circuit board 31.

[0047] In the embodiment of the present application, the mechanism action control unit 4 is as follows Figure 2As shown, it includes a bar clamping cylinder 41, an electrode clamp 42 and a feeding oil cylinder 43. Among them, the electrode clamp 42 and the feeding oil cylinder 43 are both arranged on the base body, and the electrode clamp 42 is slidingly arranged in the horizontal direction, the bar clamping cylinder 41 is arranged directly above the initial position of the electrode clamp 42, used to provide clamping force to the titanium alloy bar A located on the electrode clamp 42, and the feeding oil cylinder 43 is located on one side of the electrode clamp 42, the piston rod end of the feeding oil cylinder 43 is fixedly connected with the side wall of the electrode clamp 42, and in the welding process, the feeding oil cylinder 43 plays a role in controlling the feeding of the electrode clamp 2, and by controlling the extension and retraction of the piston rod, the position of the electrode clamp 42 can be adjusted.

[0048] Further, the mechanism action control unit 4 also includes a welding shield 44 and a limit switch 45. The welding shield 44 plays a role in physical protection, preventing sparks, heat and other potential hazards in the welding process from causing harm to the operator, and the limit switch 45 is used to detect the position state of the welding shield 44 in real time and accurately. Only when the limit switch 45 detects that the welding shield 44 is in the closed state, the whole system will allow the heating butt welding operation to be performed, which eliminates the safety hazards caused by misoperation or accidental conditions from the source, and effectively guarantees the safety of the production process. Moreover, the bar clamping cylinder 41, the electrode clamp 42, the feeding oil cylinder 43, the welding shield 44 and the limit switch 45 are all connected with the PLC controller 2, so that the PLC controller 2 can cooperatively control these components, ensuring that the whole mechanism action control unit 4 can stably operate according to the preset program and parameters, providing a reliable guarantee for the welding operation of the titanium alloy bar, and greatly improving the automation degree and precise control ability of the welding process.

[0049] In addition, as shown, Figure 3 The present application also provides a use method of the flash butt welding machine control system for titanium alloy bar welding, and the specific process is as follows:

[0050] 1) Parameter setting: according to the specification of the titanium alloy bar A to be welded, the heat required in each stage is determined, and then the current size and duration of each stage are set on the man-machine interface 1 according to the heat required in each stage;

[0051] 2) Clamping material: after step 1) is completed, the welding shield 44 is controlled by the PLC controller 2, the titanium alloy bar A to be welded is placed in the material clamping area, the bar clamping cylinder 41 is controlled to extend, the electrode clamp 42 clamps the titanium alloy bar A, and then the welding shield 44 is closed, and when the limit switch 45 detects that the welding shield 44 is closed in place;

[0052] 3) welding: after step 2) is completed, the PLC controller 2 controls the thyristor control circuit board 31 to make the first thyristor 32 and the second thyristor 33 start the flash discharge, enter the flash establishing stage P1, and quickly heat the welding position of the rod material according to the set current, and after the duration T1 of the P1 stage ends; the PLC controller 2 controls the electrode clamp 42 to feed at a uniform speed through the feeding oil cylinder 43, so that the welding position is close, and the first thyristor 32 and the second thyristor 33 discharge according to the set current of the stable heating stage P2, and when the duration T2 of the P2 stage ends, the feeding oil cylinder 43 reaches the stamping welding area, the PLC controller 2 controls the thyristor control circuit board 31 to make the first thyristor 32 and the second thyristor 33 discharge according to the set current of the stamping welding stage P3, and the feeding oil cylinder 43 continues to feed uniformly, and when the duration T3 of the P3 stage ends, the stamping welding operation is completed; at this time, the PLC controller 2 controls the welding guard plate 44 to be opened, and the rod material clamping cylinder 41 and the feeding oil cylinder 43 are reset, and the whole welding process is completed.

[0053] The above description is merely a specific implementation of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application.

[0054] It should be understood that the present application is not limited to the above-described and described, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A control system for a flash butt welding machine for welding titanium alloy bars, characterized in that, The system includes a human-machine interface (1), which is connected to a welding heat control unit (3) and a mechanism motion control unit (4) via a PLC controller (2). The welding heat control unit (3) and the mechanism motion control unit (4) work together via the PLC controller (2) to perform welding operations on the titanium alloy bar (A). Among them, the welding heat control unit (3) is the core of the entire control system. When controlling the heat, it is divided into the following three stages: the first stage is the flash establishment stage P1. In this stage, the workpiece is rapidly heated by applying a short-term relatively large current to the bar stock to form a spark jet-flash, thereby establishing a workpiece heating circuit; the second stage is the stable heating stage P2. In this stage, the bar stock is heated by continuously applying a long-term relatively small current to the bar stock so that the temperature of the bar stock in this stage reaches the specified welding temperature; the third stage is the stamping welding stage P3. In this stage, the bar stock is squeezed against each other under upsetting by applying a short-term relatively large current to the bar stock to achieve the welding function; the durations corresponding to the three stages P1, P2 and P3 are T1, T2 and T3 respectively, and the current magnitude and duration of each stage are set through the human-machine interface (1); The welding heat control unit (3) includes a thyristor control circuit board (31), a first thyristor (32) and a second thyristor (33). The first thyristor (32) and the second thyristor (33) are respectively connected to the thyristor control circuit board (31). The thyristor control circuit board (31) is connected to the PLC controller (2). The thyristor control circuit board (31) outputs a continuous analog signal to adjust the conduction angle of the first thyristor (32) and the second thyristor (33) according to the control command signal of the PLC controller (2), so as to control the current magnitude at each stage of welding. The first thyristor (32) and the second thyristor (33) are connected in anti-parallel. The method of using the flash butt welding machine control system for welding titanium alloy bars includes the following steps: Step 1, Parameter setting: Determine the heat required for each stage according to the specifications of the titanium alloy bar (A) to be welded, and then set the current magnitude and duration of each stage on the human-machine interface (1) according to the heat required for each stage. Step 2, clamping materials: After step 1 is completed, the welding guard plate (44) of the mechanism action control unit (4) is opened by the PLC controller (2). The titanium alloy bar (A) to be welded is placed in the material clamping area, and the bar clamping cylinder (41) of the mechanism action control unit (4) is extended to make the electrode clamp (42) clamp the titanium alloy bar (A). Then the welding guard plate (44) is closed. The limit switch (45) of the mechanism action control unit (4) detects that the welding guard plate (44) is closed in place. Step 3, Welding: After step 2 is completed, the PLC controller (2) controls the welding heat control unit (3) to start the first thyristor (32) and the second thyristor (33) to start ignition and discharge, entering the flash establishment stage P1. The welding part of the bar is heated according to the set current. After the duration T1 of stage P1 ends, the feeding cylinder (43) of the control mechanism action control unit (4) of the PLC controller (2) controls the electrode clamp (42) to feed at a constant speed, and makes the first thyristor (32) and the second thyristor (33) follow the stable heating stage P.

2. The current discharge is set. When the duration of P2 segment T2 ends, the feeding cylinder (43) arrives at the stamping welding area. The PLC controller (2) controls the first thyristor (32) and the second thyristor (33) to discharge according to the current set in the stamping welding stage P3. The feeding cylinder (43) continues to advance evenly. When the duration of P3 segment T3 ends, the forging welding operation is completed. At this time, the PLC controller (2) controls the opening of the welding guard plate (44) and resets the bar clamping cylinder (41) and the feeding cylinder (43). The entire welding process ends.

2. The control system for a flash butt welding machine for titanium alloy bars according to claim 1, characterized in that, The thyristor control circuit board (31) is a PAC16P single-phase phase-shifting voltage regulating board.

3. The control system for a flash butt welding machine for titanium alloy bars according to claim 1, characterized in that, The first thyristor (32) and the second thyristor (33) both adopt a flat plate structure and their model is KP500A, 1600V.

4. The control system for a flash butt welding machine for titanium alloy bars according to claim 1, characterized in that, The mechanism action control unit (4) includes a bar clamping cylinder (41), an electrode clamp (42), and a feeding cylinder (43). The electrode clamp (42) and the feeding cylinder (43) are both mounted on the base. The bar clamping cylinder (41) is located directly above the electrode clamp (42) and is used to provide clamping force to the titanium alloy bar (A) located on the electrode clamp (42). The feeding cylinder (43) is located on one side of the electrode clamp (42). The piston rod end of the feeding cylinder (43) is fixedly connected to the side wall of the electrode clamp (42). The feeding cylinder (43) is used to control the feed of the electrode clamp (42) during welding.

5. The control system for a flash butt welding machine for titanium alloy bars according to claim 4, characterized in that, The mechanism action control unit (4) also includes a welding guard plate (44) and a limit switch (45) disposed on the base, the limit switch (45) being used to detect the position of the welding guard plate (44).

6. The control system for a flash butt welding machine for welding titanium alloy bars according to claim 5, characterized in that, The bar stock clamping cylinder (41), electrode clamp (42), feeding cylinder (43), welding guard plate (44) and limit switch (45) are all connected to the PLC controller (2).

7. The control system for a flash butt welding machine for titanium alloy bars according to claim 1, characterized in that, The human-machine interface (1) mainly consists of a parameter setting area, an action start / stop button, a heating current monitoring section, a welding zone temperature detection section, and an over-temperature alarm section. The current magnitude and duration of each stage are set through the parameter setting area of ​​the human-machine interface (1).

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