JP3242257B2 - Flash butt welding machine abnormality judgment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus having a function of detecting an abnormality of a flash butt welding machine at an early stage.

[0002]

2. Description of the Related Art Conventionally, equipment has been automated by introducing a computer for performing sequence control into the equipment.
The automated equipment performs an operation sequentially by detecting an input signal of a sensor or the like based on a program of the computer and outputting an operation signal of a solenoid valve, a relay or the like. Also, as the scale of the automation equipment increases, the computer program becomes more complicated, and the number of components such as sensors, solenoid valves, and relays increases. In the case of such automated equipment, if a failure occurs in a component such as a sensor, a solenoid valve, or a relay, the equipment does not operate normally and the automated equipment stops.

[0003]

As described above, when a failure occurs in a large-scale automation facility, a computer program must be monitored and investigated in order to find the failure location. It takes a long time. Also,
Monitoring computer programs requires specialized knowledge.

[0004] It is an object of the present invention to provide a flash butt welding machine abnormality judging apparatus capable of detecting an abnormal portion in a short time and without requiring specialized knowledge about a program.

[0005]

The present invention relates to (a) a flash butt welding machine 1 comprising: (a1) a fixed base 6 provided at a fixed position; and (a2) a fixed base 6 fixed to the fixed base 6. One clamp 4 for holding the welded metal band 2; (a3) the other clamp 5 for holding the other welded metal band 3; and (a4) the other clamp 5 provided. The other metal band 3 held by the other clamp 5 is attached to the one metal band 2 held
(A5) detecting the return limit of the movable base 7 which has moved away from the fixed base 6 in such a manner that the movable base 7 is welded in close proximity to the one metal band 2 and the other metal band 3; (A6) a second sensor 11 for detecting a line limit of the movable platform 7 approaching the fixed platform 6, (a7) a cylinder 31 for reciprocating the movable platform 7, and (a8) a cylinder 31. Valve 32 for reciprocating movement control of
(A9) a flash butt welding machine 1 including pinch feed motors 34 and 35 for moving the other metal band 3; and (b) the control means 20, wherein the one metal band on the fixed base 6 side. 2 and the step of holding the one metal band 2 by the one clamp 4, and cutting the poorly shaped tip of the one metal band 2 on the side of the fixing base 6 so that the cut surface is in the conveying direction of the one metal band 2. Verticalizing; holding the other metal band 3 on the moving table 7 side with the other clamp 5; aligning the center of the one metal band 2 with the center of the other metal band 3; Cutting the poorly shaped tip of the metal band 3 to make the cut surface perpendicular to the direction of conveyance of the other metal band 3, and moving the other side of the moving table 7 so that the moving table 7 can move forward. Step of turning the metal strip 3 into a loop 61 and a movement start command And generating a signal for operating the electromagnetic valve 32 to cause the movable table 7 to move forward by the cylinder 31 so that the one metal band 2 and the other metal band 3 are brought into contact with each other. An electric current is caused to flow between the one metal band 2 and the other metal band 3, and the moving table 7 is gradually advanced, and the moving table 7 is moved from the front end of the one metal band 2 to the front end of the other metal band 3. After the flash has been blown out and sufficiently heated, when the tip of the one metal strip 2 and the tip of the other metal strip 3 have melted, the moving table 7 is immediately advanced to perform welding. A step of performing flash trimming of a welded portion between the one metal band 2 and the other metal band 3 after welding in this order, repeatedly performing a series of welding operation steps, Output the forward command to start the operation, A flash butt welding machine abnormality determination device including: a control unit for outputting a signal for operating the electromagnetic valve so that the moving body moves forward by the cylinder; and (c) a display unit, which is a flowchart. A menu screen for selecting characters 50 on the screen, characters 51 on the welder screen, and characters 52 on the sensor operation screen is displayed, and the entire process of the flash butt welding machine 1 is described together with the characters 50 on the flowchart screen in a welding sequence 53. Are divided into a plurality of blocks, the characters of the steps of each block are displayed, the colors of the characters representing the steps of the block in which the abnormality has occurred are inverted, and the plurality of welding sequence operations constituting the welding sequence 53 are performed. The process is displayed, and the color of the character 54 indicating the process in which the abnormality has occurred is inverted, and a plurality of characters constituting the welder screen 51 are displayed. The sensors are displayed in characters on the arrangement in the flash butt welding machine 1, the colors of the characters representing the sensors in which an abnormality has occurred are inverted, and the characters representing the plurality of sensors constituting the sensor operation screen 52 are displayed as: A display means 25 for displaying in the list and inverting the color of a character representing a sensor in which an abnormality has occurred; An AND gate that outputs a monitoring timer start signal when a signal for operating the electromagnetic valve 32 so that the moving body 7 moves forward by the 31 and an output of the second sensor 11 in a state where the moving table 7 is not detected are given. (E) a monitoring timer that counts a time t of a monitoring timer activation signal until the second sensor 11 detects the moving body 7 in response to the output of the AND gate element 43; (F) counted the time t predetermined interval of time tc
(G) monitoring and control means, which responds to the output of the time-over determining means, and outputs the abnormality-determining signal when the time is longer; A determination is made, and the result of the determination is given to the display means.
The color of the character 53 indicating the process of the block in which the abnormality is displayed together with 0 is reversed, and the color of the character 54 representing the welding sequence operation process in which the abnormality is occurring is reversed, and the abnormality occurs. And a monitoring control means for inverting the color of the character representing the second sensor 11.

The present invention also relates to a flash butt welding machine 1
A third sensor 13 for detecting an opening limit of the other clamp 5 not holding the other metal band 3 and an opening limit of the one clamp 4 not holding the one metal band 2. And a fourth sensor 14 for detection.

Still further, the present invention includes a storage means for storing, for each step, a component of the flash butt welding machine which may have a failure when an abnormality occurs, and the display means comprises: When the time-over determination means determines that the process is abnormal, the component corresponding to the process is read from the storage means and displayed.

[0008]

According to the present invention, a flash butt welding machine 1
Are performed in a predetermined order by the control means 20 to perform a series of welding operation steps.

In particular, according to the present invention, the display means 25
A menu screen for selecting a character 50 on the flowchart screen, a character 51 on the welder screen, and a character 52 on the sensor operation screen is displayed as shown in FIG. 5 which will be described later, and as shown in FIG. Screen character 50
At the same time, the entire process of the flash butt welding machine 1
The characters of the process of each block are displayed by dividing into a plurality of blocks. Further, as shown in FIG. 6 to be described later, a plurality of welding sequence operation steps constituting the welding sequence 53 are displayed, and as shown in FIG.
A plurality of the sensors constituting 1 are displayed in characters on the arrangement in the flash butt welding machine 1, and as shown in FIG. 8, characters representing the plurality of sensors are displayed in a list. The color of the character indicating the process and the sensor in which the abnormality has occurred is inverted, and an abnormal situation is displayed. Therefore, an abnormal part can be detected in a short time and without requiring specialized knowledge about a program.

Further, according to the present invention, the storing means stores, for each process, a component of the automation equipment which may cause a failure when an abnormality occurs. The display means reads and displays the component corresponding to the step from the storage means when the time-over determination means determines that the step is abnormal. Therefore, it is possible to easily detect a component of the flash butt welding machine that may have a failure.

[0011]

FIG. 1 is a block diagram showing a schematic electrical configuration of a flash butt welding machine 1 according to one embodiment of the present invention. In this flash butt welding machine 1, metal bands 2 and 3 as a pair of members to be welded are held by clamps 4 and 5, respectively. The clamp 4 is fixed to a fixed base 6 provided at a fixed position. The clamp 5 is attached to a moving table 7 so that the metal band 3 of another workpiece can be moved toward and away from the metal band 2 of another workpiece. The moving table 7 moves, and the metal strips 2 and 3 as the objects to be welded come close to each other, and the metal strips 2 and 3 are welded.

The signals from the sensors 10 to 14 are input to the input means 21 of the computer 20. Based on the inputs of the sensors 10 to 14, the control means 22 performs an operation, and outputs an output signal of a relay to be driven to the relay board 24 via the output means 23. Thus, the solenoid valve 32 and the motors 34 and 35 of the cylinder 31 of the flash butt welding machine 1 are driven. When the solenoid valve 32 is set to the neutral position P0, oil from the pump P, which is a hydraulic pressure source, is similarly supplied to both ports of the cylinder 31, and the cylinder 31 is not driven.

The computer 20 comprises an input means 21 and a control means 2
2, including output means 23 and monitoring means 25. Monitoring means 25
Captures each signal of the input means 21, the output means 23, and the relay panel 24, and constantly compares the time from the start of operation of each step of the flash butt welding machine 1 to the end of the operation with a predetermined time to perform flash butt welding. The operation of the machine 1 is monitored. At this time, when the time from the operation start to the operation end of each process is longer than a predetermined time, the alarm means 26
Outputs an abnormal signal to The alarm means 26 receives an abnormal signal and performs an alarm display or generates an alarm sound.

Sensor 10 of flash butt welding machine 1
Is for detecting the return limit of the movable base 7 that has left the fixed base 6, and the sensor 11 is provided with the fixed base 6 of the movable base 7.
This is for detecting a line limit approaching. Sensor 1
2 is for detecting the presence or absence of the metal band 3, the sensor 13 is for detecting the opening limit of the clamp 5 that does not hold the metal band 3, and the sensor 14 is for detecting the metal band 2 of the clamp 4. This is for detecting the opening limit that does not hold. The cylinder 31 is for reciprocating the moving table 7. The motors 34 and 35 are pinch feed motors and move the metal band 3. Figure 1 Actual number of sensors, cylinders and motors of flash butt welding machine
Although they are larger than those indicated by, they are omitted to simplify the description.

FIG. 2 is a flowchart showing the processing contents of the computer 20 shown in FIG. Steps a1 to a10 show the contents of the processing of each step in the welding operation of the flash butt welding machine 1, and steps a11 to a17 show the processing of the monitoring means 25 of the present invention. .

In step a1, the welding operation is started in response to a request for starting the welding operation. In step a2, it is determined whether or not the welding operation can be started based on a signal of a sensor attached to the flash butt welding machine 1 or the like. At this time, if the flash butt welding machine 1 is not in a state where the welding operation can be performed, the process waits until a state in which the welding operation can be performed. Next, when the flash butt welding machine 1 is ready to perform a welding operation, the process proceeds to step a3 in the associating process and outputs an operation start command of the first process of the welding operation. In step a4, the solenoid valve and the relay to be excited are excited based on the start command of the first step. At this time, the processing of the monitoring means 25 is started at step all. In step a5, the input of the sensor for terminating the operation of the flash butt welding machine 1 driven in step a4 is confirmed. At this time, if there is no input from the sensor for terminating the operation, the processing of steps a3 to a5 is repeated.
In step a5, if there is an input from the operation end sensor, the process proceeds to step a6, and a command to end the operation of the first step is output. Next, in step a7, the excitation of the solenoid valve and the relay excited in step a1 is stopped, and the process proceeds to the next step in step a8. In step a9, it is determined whether or not the process executed in step a8 is the last process of the welding operation. If not, the process returns to step a3 to output an operation start signal of the next process.
If the process executed in step a8 in step a9 is the final process, the process proceeds to step a12 to end a series of welding operations.

Next, the processing contents of the monitoring means 25 of the present invention will be described below. As described above, the process branches at step a3, and the process of the monitoring unit 25 is started at step a11. In step a12, the monitoring timer is started, and the time t is counted up. Next, step a1
In step 3, it is confirmed whether or not there is an input of a sensor for terminating the operation of the currently executed process. If there is no input from the sensor for completing the operation, the process proceeds to step a14, and if there is an input, the process proceeds to step a17, and the process of monitoring the process ends. In step a4, the predetermined time tc is compared with the elapsed time t of the monitoring timer started in step a12. If the time t is longer than the time tc, it is determined that a time-over is abnormal, and the process proceeds to step a15. Time t is time t
If it is shorter than c, the process returns to step a13, and it is determined again whether there is an input from the sensor for completing the operation.

In step a15, the solenoid valve 32, the output state of the relay, and the input state of the sensor when the time over is determined in step a14 are checked.
If the relay is not energized, the solenoid valve 32 and the relay are judged to be abnormal, and if they are energized normally, the sensor 1
Judgment 1 is abnormal. Thus, at step a15, the cause of the time over is determined, and the result is output to step a16. In step a16, an alarm for notifying the operator is generated based on the information in step a15. At this time, the operator
The cause of the failure can be easily known on the processing screen or the like. Next, in step a17, the processing of the monitoring means 25 ends. The processing of steps a11 to a17 is
The process is repeated for each step of the welding operation of the flash butt welding machine 1. This makes it possible to determine whether or not the processing time of the process is longer than a predetermined time. If the processing of each process is longer than the predetermined time, it can be easily confirmed.

FIG. 3 is a diagram for explaining an example of monitoring by the monitoring means 25 when the moving table 7 moves forward. FIG.
As shown in (a), when a forward command is output and the forward solenoid valve 32 is excited and set to the position P1, oil is supplied to one port of the cylinder 31 through a flow path indicated by an arrow. Then, since the oil from the other port returns to the tank, the moving table 7 moves in the direction of the arrow 42. At the same time, the monitoring timer of the monitoring means 25 starts counting.

As shown in FIG. 3 (b), when the moving table 7 which has moved forward contacts the sensor 11 of the forward limit, the forward command is cut off, and the excitation of the forward solenoid valve 32 is stopped.
The solenoid valve is set to the neutral position P0, and oil is similarly supplied to both ports of the cylinder 31. As a result, the moving table 7 stops. At this time, the forward limit sensor 1
If 1 is defective, the count value t of the monitoring timer increases, and when the count value exceeds a predetermined set value tc, the monitoring means 25
Is determined to be abnormal.

FIG. 4 is a logic circuit diagram for explaining conditions when the moving table 7 shown in FIG. 3 moves forward. As described above, the forward command is output to the moving base 7, the forward solenoid valve is excited, and the forward limit sensor 11 is turned off.
At the time of FF, the output of the AND gate element 43 becomes high level, the monitoring timer starts, and when the movable base 7 moves forward and the sensor 11 of the forward limit becomes ON, the monitoring timer stops counting.

FIG. 5 is a diagram showing a menu screen on the display means of the monitoring means 25. Flowchart screen 50
Divides the entire process of the flash butt welding machine 1 into blocks, and includes block processes such as an origin condition, an outgoing sequence, and an incoming sequence. The inversion of the character color in the block process of the welding sequence 53 indicates that an abnormality has occurred in this process. The welder screen 51 is a screen showing the arrangement of sensors and the like of the flash butt welding machine 1 for each block, and is shown in FIG. 7 described later. Sensor operation screen 52
Is a screen showing a list of sensors, which is shown in FIG. 8 described later.

FIG. 6 is a diagram showing each step of the welding sequence 53. The inversion of the color of the character “forward from the middle point of the moving vehicle” 54 indicates that an abnormality has occurred in this step. Each screen and the characters that represent that screen,
May be represented by the same reference symbol.

FIG. 7 is a screen showing an arrangement of sensors and the like of the flash butt welding machine 1. The inversion of the color of the character of the name of the limit switch LS-34 indicates that an error has occurred in this limit switch. This limit switch is a sensor 11 which is a forward limit switch. FIG. 8 is a diagram illustrating a list of limit switches. In the list of limit switches, the symbol of the limit switch, the name of the confirmation operation, and the address are displayed. The character in the column of the limit switch LS-34 is highlighted, which indicates that an abnormality has occurred in the limit switch LS-34 in this column. As described above, by displaying the abnormal location of the flash butt welding machine 1 on the display unit of the monitoring unit 25,
The operator can easily confirm the abnormal location.

Table 1 is a table showing schematic process contents of the flash butt welding machine 1 shown in FIG.

[0026]

[Table 1]

In the first step, the metal strip 2 on the fixing table 6 side
Is held by the clamp 4. In the second step, the fixing base 6 cuts the poorly shaped tip of the metal band 2 and makes the cut surface of the metal band 2 perpendicular to the metal band 2 transport direction. In the third step, the metal band 3 of the moving table 7 is held by the clamp 5, and the center of the metal band 2 on the fixed table 6 and the center of the metal band 3 on the moving table 7 are aligned. In the fourth step, the poor end of the metal band 3 on the movable table 7 side is cut off, and the cut surface of the metal band 3 is made perpendicular to the transport direction of the metal band 3. In the fifth step, the metal strip 3 on the side of the moving table 7 is formed into a loop 61 as shown in FIG. 3A so that the moving table 7 can move forward. In the sixth step, as shown in FIG. 3B, the moving table 7 is advanced, and the metal strip 3 on the moving table 7 side is moved.
And the metal band 2 on the side of the fixing base 6 are subjected to an associating step. In the seventh step, a current is caused to flow between the metal band 2 and the metal band 3 which have been brought into contact with each other, the moving table 7 is gradually advanced, a flash is blown from the tip of the metal band 3 and the metal band 2, and heating is sufficiently performed. After that, when the distal end portions of the metal bands 3 and 2 are melted, the moving table 7 is immediately advanced to perform welding. In the eighth step, deburring of the welded portion of the metal band after welding, so-called flash trimming, is performed.

[0028]

As described above, according to the present invention, the AND gate element 43 operates the solenoid valve 32 so that the moving table 7 moves forward by the cylinder 31 and the forward command for starting the operation of the contacting step. And a signal from the control means 20 and the output of the second sensor 11 are provided,
The moving body 7 is moved by the forward command of the operation start and the cylinder 31.
A signal for operating the solenoid valve 32 so that
When the output of the sensor 11 in a state in which the moving body 7 is not detected is given, a monitoring timer start signal is output, whereby the monitoring timer determines the time t until the second sensor 11 detects the moving body 7. The counting and time-over determining means determines that the counted time t is a predetermined time tc.
If it is longer, it is determined to be abnormal, and an abnormality determination signal is output and given to the monitoring control means.

In particular, according to the present invention, the operating state of the flash butt welding machine is displayed by the display means 25. The display means 25 displays the character 50 on the flowchart screen.
And a menu screen for selecting characters 51 on the welder screen and characters 52 on the sensor operation screen. The entire process of the flash butt welding machine 1 is divided into a plurality of blocks together with the characters 50 on the flowchart screen. The characters of the steps of each block are displayed, and a plurality of welding sequence operation steps constituting the welding sequence 53 are displayed as shown in FIG. 6 described above, and the welder screen 51 is displayed as shown in FIG. A plurality of the above-mentioned sensors are displayed as characters in the arrangement in the flash butt welding machine 1, and characters representing the plurality of sensors constituting the sensor operation screen 52 are displayed in a list, and an abnormality has occurred. Invert the color of the character representing the process and sensor. As a result, it is possible to easily grasp the abnormal part.

The display means displays the status of the abnormality if abnormal. Therefore, it is possible to detect an abnormal part without requiring specialized knowledge about a program. In addition, since an abnormal portion can be detected in a short time, the time for failure recovery can be shortened, and productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a flash butt welding machine 1 according to one embodiment of the present invention.

FIG. 2 is a flowchart showing processing contents of a computer 20 shown in FIG.

FIG. 3 is a view for explaining a case where a moving table 7 of the flash butt welding machine 1 moves forward.

FIG. 4 is a logic circuit diagram for explaining a condition for activating a monitoring timer.

5 is a menu screen of a display unit of the monitoring unit 25. FIG.

FIG. 6 is a flowchart screen of a display unit of the monitoring unit 25.

7 is a welder screen of a display unit of the monitoring unit 25. FIG.

8 is a sensor operation screen of a display unit of the monitoring unit 25. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flash butt welding machine 2, 3 Metal strip 4, 5 Clamp 6 Fixing stand 7 Moving stand 10-14 Sensor 20 Calculator 21 Input means 22 Control means 23 Output means 24 Relay board 25 Monitoring means 26 Alarm means 32 Solenoid valves 34, 35 motor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-116902 (JP, A) JP-A-5-181511 (JP, A) JP-A-2-148108 (JP, A) JP-A-49-108 21582 (JP, A) JP-A-53-122645 (JP, A) JP-A-4-91869 (JP, A) JP-A-62-137182 (JP, A) JP-A-62-179875 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 11/25 B23K 11/04 G05B 23/02

Claims (3)

(57) [Claims] 1. A flash butt welding machine 1 comprising: (a1) a fixed base 6 provided at a fixed position; and (a2) fixed to the fixed base 6 to hold one of the metal strips 2 to be welded. (A3) the other clamp 5 for holding the other welded metal band 3; and (a4) the other clamp 5 provided, and the one metal held by the one clamp 4 The other metal band 3 held by the other clamp 5 on the band 2
(A5) detecting the return limit of the movable base 7 which has moved away from the fixed base 6 in such a manner that the movable base 7 is welded in close proximity to the one metal band 2 and the other metal band 3; (A6) a second sensor 11 for detecting a line limit of the movable platform 7 approaching the fixed platform 6, (a7) a cylinder 31 for reciprocating the movable platform 7, and (a8) a cylinder 31. Valve 32 for reciprocating movement control of
(A9) a flash butt welding machine 1 including pinch feed motors 34 and 35 for moving the other metal band 3; and (b) the control means 20, wherein the one metal band on the fixed base 6 side. A step of holding the second metal band 2 by the one clamp 4, and cutting a poorly shaped tip of the one metal band 2 on the side of the fixing base 6 so that the cut surface is moved in the conveying direction of the one metal band 2. A step of vertically setting; a step of holding the other metal band 3 on the moving table 7 side by the other clamp 5 to align the center of the one metal band 2 with the center of the other metal band 3; Cutting the poorly shaped tip of the metal strip 3 to make the cut surface perpendicular to the direction of transport of the other metal strip 3, and moving the other end of the movable base 7 so that the movable base 7 can move forward. Step of turning the metal strip 3 into a loop 61 and starting the movement A signal for operating the solenoid valve 32 by generating a command, causing the movable table 7 to move forward by the cylinder 31, and bringing the one metal band 2 and the other metal band 3 into contact with each other; The one metal band 2 and the other metal band 3
, The moving table 7 is gradually advanced, a flash is blown from the tip of the one metal strip 2 and the tip of the other metal strip 3, and after being sufficiently heated, When the tip of one metal strip 2 and the tip of the other metal strip 3 are melted, the moving table 7 is immediately advanced to perform welding, and the one metal strip 2 after welding is welded. A step of performing flash trimming of a welded portion with the other metal band 3 is repeated in this order, and a series of welding operation steps are repeatedly performed, and a forward command for starting the operation of the abutting step is output. A flash butt welding machine abnormality determination device including: a control unit 20 that outputs a signal for operating the electromagnetic valve 32 so that the moving body 7 moves forward; 50 A menu screen for selecting a character 51 on the welder screen and a character 52 on the sensor operation screen is displayed. Along with the character 50 on the flowchart screen, the entire process of the flash butt welding machine 1 includes a plurality of processes including a welding sequence 53. Dividing into blocks, displaying the characters of the steps of each block, inverting the color of the characters representing the steps of the block in which an abnormality has occurred, displaying each of a plurality of welding sequence operation steps constituting the welding sequence 53, The color of the character 54 representing the process in which the abnormality has occurred is inverted, and the plurality of sensors constituting the welder screen 51 are displayed as characters in the arrangement in the flash butt welding machine 1 and the abnormality has occurred. The colors of the characters representing the sensors are inverted, and the characters representing the plurality of sensors constituting the sensor operation screen 52 are displayed in a list, and an error occurs. A display means 25 for inverting the color of the character representing the sensor being operated; and (d) an AND gate element 43, wherein the moving body 7 is advanced by the cylinder 31 and a forward command for starting the operation of the abutting step. A that outputs a monitoring timer start signal when a signal for operating the electromagnetic valve 32 and an output of the second sensor 11 in a state in which the movable platform 7 is not detected are given to
An ND gate element 43; (e) a monitoring timer that counts a time t of a monitoring timer activation signal until the second sensor 11 detects the moving object 7 in response to an output of the AND gate element 43; The time t is a predetermined time tc
(G) monitoring and control means, which responds to the output of the time-over determination means, and outputs an abnormality determination signal when the time is longer; A determination is made, and the result of the determination is given to a display means, and a character 53 representing the process of the block in which the abnormality is displayed is displayed together with the character 50 on the flowchart screen
Monitoring control means for inverting the color of the character 54 representing the welding sequence operation step in which an abnormality has occurred, and inverting the color of the character representing the second sensor 11 in which an abnormality has occurred. An abnormality judging device for a flash butt welding machine characterized by including: 2. The flash butt welding machine 1 includes: a third sensor 13 that detects an opening limit of the other clamp 5 that does not hold the other metal band 3; and the one metal of the one clamp 4 The abnormality determination device for a flash butt welding machine according to claim 1, further comprising a fourth sensor (14) for detecting an opening limit that does not hold the band (2). 3. A flash memory device comprising: a storage unit for storing, for each process, a component of a flash butt welding machine which may have a failure when an abnormality occurs, wherein the display unit includes the time-over determination unit 3. The abnormality determining apparatus for a flash butt welding machine according to claim 1, wherein when the step is determined to be abnormal, the component corresponding to the step is read out from the storage means and displayed.