CN115243820A - Control method of welding machine - Google Patents

Abstract

In the first step, the acceleration in the X-axis direction of the welding torch (60) to which the acceleration sensor (310) is mounted is detected at each predetermined time interval; and the second step is calculated by using the acceleration detected in the first step. The moving average value of the acceleration during the period; and in the third step, the number of times of detection of the acceleration during the period and the number of times E when the absolute value of the difference between the acceleration and the moving average exceeds the threshold value during the period are compared, and the number of detections and the number of times of the moving average are compared. When the ratio of the number of times (=the number of times/the number of detections) is smaller than a predetermined value, the operation of the welding machine having the torch (60) is restricted.

Description

Welding machine control method

technical field

The present disclosure relates to a control method of a welding machine, and more particularly, to a control method of a welding machine having a welding torch of a type manually operated by a welding operator.

Background technique

Conventionally, a technique is known in which a sensor such as an acceleration sensor is attached to a torch manually operated by a welding operator, and arc welding is controlled based on an output signal from the sensor (for example, refer to Patent Documents 1 to 3).

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2013-066906

Patent Document 2: Japanese Patent Laid-Open No. 2013-223879

Patent Document 3: International Publication No. 2019/202854

SUMMARY OF THE INVENTION

-The problem to be solved by the invention-

However, in arc welding in which the torch is manually operated, the welding machine may operate at an unexpected timing due to misoperation of the torch or the like, and a welding output may be generated. In such a case, not only the welding operation becomes unsafe, but also the welding failure and the deterioration of the welding quality may be caused.

However, the conventional structures disclosed in Patent Documents 1 and 2 do not disclose a technique for preventing the welding machine from operating at an unexpected timing.

On the other hand, Patent Document 3 discloses that when the current flowing through the welding torch is equal to or less than a predetermined value, and the acceleration sensor and the angular velocity sensor detect that the tip of the welding torch does not operate for a predetermined period, Invalidates the operation of the welding switch provided on the welding torch.

However, in the configuration disclosed in Patent Document 3, there are many items to be detected, and signal processing and control become complicated.

The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a control method of a welding machine that can easily prevent the welding machine from operating at an unexpected timing.

-Means to solve problems-

In order to achieve the above-mentioned object, the control method of a welding machine according to the present disclosure is a control method of a welding machine having a welding torch to which an acceleration sensor is attached, characterized by comprising: a first step of detecting at each predetermined time interval acceleration of the welding torch; a second step of calculating a moving average of the acceleration in a predetermined period using the acceleration detected in the first step; and a third step of calculating the predetermined period of time The number of times of detection of the acceleration during the period and the number of times when the absolute value of the difference between the acceleration and the moving average value in the predetermined period exceeds a predetermined threshold value are compared, and the number of detections is compared with the number of times of the When the ratio of the number of times is smaller than a predetermined value, the operation of the welding machine is restricted.

-Inventive effect-

According to the present disclosure, it is possible to easily prevent the operation of the welding machine at an unexpected timing. In addition, the work safety of the welding operator can be improved.

Description of drawings

FIG. 1 is a schematic diagram showing the configuration of an arc welding machine according to an embodiment.

FIG. 2 is a schematic diagram showing the appearance of a welding torch.

FIG. 3 is a schematic view showing the internal structure of a welding torch.

4 is a schematic configuration diagram of functional blocks of a power supply device and a welding torch.

FIG. 5 is an example of the temporal change of the acceleration in the X-axis direction of the welding torch.

6 is a schematic configuration diagram of functional blocks of a power supply device and a welding torch according to a modification.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. The following descriptions of preferred embodiments are merely exemplary in nature and are not intended to limit the disclosure, its application, or its uses.

(Embodiment)

[Structure of arc welding machine and structure of torch]

FIG. 1 is a schematic diagram showing the configuration of the arc welding machine according to the present embodiment. FIG. 2 is a schematic diagram showing the appearance of the welding torch, and FIG. 3 is a schematic diagram showing the internal structure of the welding torch.

As shown in FIG. 1 , the arc welding machine 10 (hereinafter, may be simply referred to as the welding machine 10 ) includes a power supply device 20 , a wire feeding device 30 , and a welding torch 60 . In addition, shielding gas such as CO ₂ gas is supplied to the torch 60 from the gas cylinder 80 via the gas hose 81 and the wire feeder 30 . In addition, the shielding gas is adjusted and supplied by a flow regulator (not shown) so that the pressure and the flow rate of the shielding gas become predetermined values. In addition, the gas hose 81 is accommodated in the inside of the torch cable 41, and the electric power cable 40 and the control cable 50 mentioned later are accommodated in the inside of the torch cable 41 similarly.

The power supply device 20 is connected to a power cable 40 to one of the output terminals 21 , and is connected to the workpiece cable 42 to the other, so that electric power for welding is supplied from the power cable 40 to the welding torch 60 . Specifically, the welding current is supplied to the welding wire 70 passing through the welding torch 60 via the power cable 40 housed in the welding torch cable 41 and connected to the welding torch 60 and a welding chip not shown. Further, the power supply device 20 is configured to transmit a control signal for controlling the wire feeding speed and the welding current flowing through the welding wire 70 to the wire feeding device 30 . The function of the power supply device 20 and the internal functional block configuration will be described later.

The wire feeding device 30 includes a wire feeding mechanism (not shown) and a motor 31 for driving the wire feeding mechanism, and in accordance with a control signal from the power source device 20, feeds the welding wire 70 to the workpiece (welding object) W at a predetermined speed. send. In addition, the shielding gas supplied from the gas cylinder 80 is supplied to the torch 60 . In addition, the shielding gas may be directly supplied to the torch 60 via the flow rate regulator.

The control cable 50 is connected to the power supply device 20 and the wire feeding device 30 , and is configured to transmit a control signal for controlling the wire feeding speed of the welding wire 70 as described above, and is configured to be connected to various devices provided in the welding torch 60 . Various signals are exchanged with the power supply device 20 . In addition, through the control cable 50 , driving power for various devices provided in the welding torch 60 is supplied. Moreover, the control cable 50 is comprised so that the operation signal of the torch switch 64 which determines the start/stop of welding may be sent to the power source device 20 .

As shown in FIGS. 2 and 3 , the torch 60 includes a torch body 61 , a torch holder 63 , a torch switch 64 , and a head 62 . In addition, the welding torch 60 holds the welding wire 70 inside, and the welding wire 70 is fed to the workpiece W from the front end of the head 62 .

As shown in FIG. 2 , a display unit 100 and an operation unit 200 are arranged on the torch holder 63 , and the display unit 100 includes, for example, a display device such as a liquid crystal display and an organic EL display. The display unit 100 performs various displays of welding conditions and the like. The operation unit 200 includes equipment such as operation buttons (not shown), for example, and outputs operation signals to various equipment provided in the welding torch 60 or the power supply device 20 by the operation of the welding operator. For example, the display/non-display of the display unit 100 can be switched by the operation of the operation unit 200 . In addition, when the display unit 100 is a touch panel, the functions of the operation unit 200 can be integrated into the display unit 100, and the operation unit 200 can be omitted.

Moreover, as shown in FIG. 3, the sensor part 300 is mounted in the inside of the torch holder 63, and is electrically connected to the control cable 50 which passes through the inside of the torch cable 41 via the wiring 65. As shown in FIG. In addition, a torch switch 64 is attached to the torch holder 63 , and the torch switch 64 is also electrically connected to the control cable 50 passing through the inside of the torch cable 41 via the wiring 66 . The torch switch 64 is operated, in other words, by pressing the torch switch 64 , the welding start state in which the wire feeder 30 operates and the welding current flows to the welding wire 70 is switched between the welding start state and the welding stop state. The welding stop state is an OFF state in which the supply of welding current is stopped and the wire feeder 30 is also stopped. However, as will be described later, the operation of the torch switch 64 is valid only when it can be determined based on the detection result in the sensor unit 300 that the welding operator is holding the torch 60 .

[Functional block structure of power supply unit and torch]

FIG. 4 shows a schematic configuration diagram of the functional blocks of the power supply device and the welding torch, and FIG. 5 shows an example of the temporal change of the acceleration in the X-axis direction of the welding torch. In addition, although not shown, the control cable 50 is connected to the power supply device 20 and the welding torch 60 via the wire feeder 30 as mentioned above.

As shown in FIGS. 2 to 4 , the torch 60 is provided with a display unit 100 , an operation unit 200 , and a sensor unit 300 . The functions of the display unit 100 and the operation unit 200 are as described above.

As shown in FIG. 4 , the sensor unit 300 is a device including an acceleration sensor 310, an angular velocity sensor 320, a signal processing unit 330 that performs signal processing on the outputs of the acceleration sensor 310 and the angular velocity sensor 320, and these are integrated into one package. The acceleration sensor 310 and the angular velocity sensor 320 are sensors that detect changes in acceleration or angular velocity in the directions of three mutually orthogonal axes (X-axis, Y-axis, and Z-axis shown in FIG. 2 ) in a three-dimensional space, respectively. In other words, the sensor unit 300 is a so-called 6-axis sensor. Also, the signal processing unit 330 includes an IC or an LSI. The sensor unit 300 detects the acceleration and angular velocity in each axial direction of the torch 60 and changes in these. These values are checked at every specified time interval. Further, the movement speed and movement of the tip of the torch 60 are detected based on changes in acceleration and angular velocity in each axial direction, and a predetermined position difference between the sensor unit 300 and the tip of the torch 60 , that is, the tip of the head 62 .

In addition, the signal processing unit 330 receives the analog output signals of the acceleration sensor 310 and the angular velocity sensor 320, and performs noise filtering, signal amplification, or digital processing of the analog output signal. In addition, in the present embodiment, the acceleration sensor 310 , the angular velocity sensor 320 , and the signal processing unit 330 are integrated into one package, but they may be separately prepared and mounted on a printed circuit board. Among the sensor units 300 , the detection signal of the acceleration sensor 310 is used for valid/invalid determination of the operation of the torch switch 64 to be described later.

On the other hand, the power supply device 20 is provided with a control unit 400 and a storage unit 500 , and the control unit 400 includes at least a calculation unit 410 , a determination unit 420 , and a welding control unit 430 .

The control unit 400 is a functional block that executes and implements predetermined software on a microcomputer or LSI, and the same applies to the arithmetic unit 410 , the determination unit 420 , and the welding control unit 430 included in the control unit 400 . In addition, the arithmetic unit 410, the determination unit 420, and the welding control unit 430 may be mounted on other LSIs, respectively.

The welding control unit 430 in the control unit 400 controls the wire feeding speed of the welding wire 70 fed from the wire feeding device 30 . In addition, the welding control unit 430 controls the welding output, that is, the welding current and the welding voltage flowing to the welding wire 70 .

The arithmetic unit 410 executes various arithmetic processing based on the signals output from the signal processing unit 330 of the sensor unit 300 , that is, the detection values of the acceleration sensor 310 and the angular velocity sensor 320 . For example, the speed of the tip of the welding torch 60, the amplitude, the posture of the welding torch 60, and the like are calculated.

The storage unit 500 stores welding conditions, for example, a set voltage, a set current, and a wire feed speed corresponding thereto. In addition, the storage unit 500 sequentially stores the acceleration of the welding torch 60 detected by the acceleration sensor 310 at predetermined time intervals. In the following description, the acceleration AX in the _X -axis direction (hereinafter, simply referred to as acceleration _AX ) will be mainly described. The computing unit 410 calculates a moving average value _MAX of the acceleration _AX (hereinafter simply referred to as a moving average value _MAX ) based on the acceleration _AX stored in the storage unit 500 . Here, the moving average is a value obtained by calculating the average value for each predetermined predetermined period while shifting the interval. In the present embodiment, the predetermined period is the period T shown in FIG. 5 .

The determination unit 420 performs the evaluation on the number E of times when the acceleration AX exceeds the moving average value _MAX ± the threshold value _K , that is, the number of times E when the absolute value of the difference between the acceleration _AX and the moving average value _MAX exceeds the threshold value K. count. Here, the threshold value K is a positive value.

As shown in Fig. 5, the acceleration _AX may vary greatly over time. For example, when a welding operator holds the welding torch 60, the welding torch 60 may move irregularly and sometimes due to the influence of hand shake. This movement is reflected in the acceleration A _X , and as shown in FIG. 5 , in a predetermined period T, the acceleration A _X may exceed the moving average value MA _X ± the threshold value K. In addition, the value of the threshold value K is appropriately set according to the range of the output signal of the acceleration sensor 310 due to hand shake. Therefore, the size and weight of the welding torch 60 also affect the setting of the threshold value K.

Further, the determination unit 420 compares the number N of detections of the acceleration _AX in a predetermined period T with the number E, and determines that the ratio (=E/N) of the number of detections N to the number E is smaller than a predetermined value. Since the welding operator does not hold the welding torch 60 , if the value is equal to or greater than the predetermined value, it is determined that the welding operator is holding the welding torch 60 . In the present embodiment, the predetermined value is set to 0.5, but it is not particularly limited to this, and other values can be appropriately taken. In addition, although the number of detections N is 100, it is not particularly limited to this, and other values can be appropriately taken.

The welding control unit 430 disables the operation of the torch switch 64 when it is determined by the determination unit 420 that the welding operator is not holding the welding torch 60 . Therefore, in this state, even if the torch switch 64 is pressed, the wire feeder 30 does not operate, and the welding current does not flow to the welding wire 70 . In other words, the motion of the arc welding machine 10 is restricted.

On the other hand, the welding control unit 430 enables the operation of the torch switch 64 when it is determined by the determination unit 420 that the welding operator is holding the welding torch 60 . Therefore, the operation restriction of the arc welding machine 10 is released. In this state, when the torch switch 64 is pressed, the wire feeder 30 is activated, and a welding start state in which a predetermined welding current flows to the welding wire 70 is established.

[Effect, etc.]

As described above, the control method of the welding machine according to the present embodiment is a control method of the welding machine 10 including the welding torch 60 to which the acceleration sensor 310 is attached.

This control method includes a first step of detecting the acceleration _{AX of the welding torch 60 at predetermined time intervals, and a first step of calculating a moving average value MA X of} the acceleration _AX using the acceleration _AX detected in the first step. 2 steps.

In addition, a third step is provided for the number of times N of detections of the acceleration _AX in the predetermined period T and the number of times E when the absolute value of the difference between the acceleration _AX and the moving average value _MAX in the predetermined period T exceeds the threshold value K. By comparison, when the ratio (=E/N) of the number of detections N to the number of times E is smaller than a predetermined value, the operation of the arc welding machine 10 is restricted.

According to the present embodiment, the operation of the welding machine 10 is restricted based on the acceleration A _X of the welding torch 60 and the moving average value MA _X thereof, so that the occurrence of unexpected timing due to malfunction of the torch switch 64 or the like can be easily prevented. Welding output. Thereby, the work safety of a welding operator can be improved. In addition, it is possible to prevent occurrence of defective welding, such as welding of the workpiece W at an unexpected position.

Also, unlike the configuration disclosed in Patent Document 3, in the determination of the operation restriction of the welding machine 10, the only item to be detected is the acceleration _AX , so the arithmetic processing for determination can be simplified.

Furthermore, in the determination of the operation limit of the welding machine 10, the acceleration _{AX is not directly used, but the moving average value MA X thereof} is used, so that the determination accuracy can be improved. This is further explained.

As is conventionally known, the output signal of the acceleration sensor 310 has a temperature dependence that varies depending on the temperature. Therefore, when the temperature of the surrounding environment changes, the acceleration detected by the acceleration sensor 310 also changes. In addition, since there is an individual difference in the acceleration sensor 310, the acceleration detected by the acceleration sensor 310 varies among welding machines 10 due to the individual difference. In addition, the acceleration detected by the acceleration sensor 310 also varies due to a mounting error when the acceleration sensor 310 is mounted on a mounting substrate (not shown) or the mounting error when the sensor unit 300 is mounted on the torch holder 63 .

In this way, the output signal of the acceleration sensor 310 , in other words, the acceleration detected by the acceleration sensor 310 has a plurality of fluctuation factors. Therefore, if the determination of the operation restriction of the welding machine 10 is performed directly using the acceleration A _X , there is a fear that the determination accuracy of the operation restriction of the welding machine 10 may decrease due to the detection deviation of the acceleration A _X.

On the other hand, according to the present embodiment, by using the moving average value _MAX , the influence of the fluctuation factor is alleviated, so that it is possible to accurately determine whether or not the operation restriction of the welding machine 10 is necessary.

In addition, the determination unit 420 may count the following number of times F in place of the number of times E. The number of times F is when the absolute value of the difference between the acceleration A _X in the predetermined period T and the acceleration A _X in the predetermined period T and the standard deviation SD _{X of the acceleration A X (} hereinafter simply referred to as standard deviation SD _X ) exceeds the threshold value K1. number of situations. In this case, in the third step, when the number N of detections of the acceleration _{AX in the predetermined period T and the absolute value of the difference between the acceleration AX and the standard deviation SD X in the} predetermined period T exceed the threshold value K1 The number of times F is compared, and when the ratio (=F/N) of the number of detections N to the number of times F is smaller than a predetermined value, the operation of the welding machine 10 is restricted.

In this way, similarly to the case of the number of times of use E, it is possible to easily prevent the occurrence of welding output at an unexpected timing. In addition, it is of course possible to improve the work safety of the welding operator and to prevent the occurrence of defective welding. In addition, the threshold value K1 is a value different from the threshold value K. However, it can also be the same value.

In addition, the operation of the welding machine 10 may be restricted by a different method. For example, when the standard deviation SD _X in a predetermined period T is equal to or less than a predetermined threshold value, the determination unit 420 may determine that the welding operator is not holding the welding torch 60 and restrict the operation of the welding machine 10 .

In the third step, when the ratio of the number of detections N to the number of times E or the number of times F is smaller than a predetermined value, the operation of the torch switch 64 provided in the welding torch 60 is disabled.

In this way, even if the torch switch 64 is operated, the welding start state is not entered, and the operation of the welding machine 10 can be reliably restricted. Thereby, of course, prevention of the occurrence of unexpectedly timed welding output, improvement of work safety of the welding operator, and prevention of occurrence of defective welding can be reliably achieved.

In addition, in the present embodiment, the method of restricting the operation of the welding machine 10 by using the acceleration AX in the _X -axis direction of the welding torch 60 and the moving average value MA _X thereof has been described, but it is not particularly limited to this. The acceleration A _Y in the Y-axis direction, the acceleration A _Z in the Z-axis direction, and their moving average values can be used. In addition, the square root of the sum of the squares of the accelerations A _X , A _Y , and A _Z in the respective axial directions may also be used.

Moreover, the movement of the welding torch 60 by hand shake is more likely to occur in a plane including the Y-axis direction, which is the longitudinal direction of the welding torch 60, than in the Z-axis direction. Therefore, by using the acceleration A _X in the X-axis direction or the acceleration A _Y in the Y-axis direction, it is possible to accurately determine hand shake and further determine whether or not the welding operator is holding the welding torch 60 , and it is possible to improve the determination accuracy of the operation restriction of the welding machine 10 . .

In addition, in the present embodiment, an example is shown in which the operation of the welding machine 10 is restricted when the ratio of the number of detections N to the number of times E or the number of times F is smaller than the predetermined value, but for example, the welding conditions of the welding machine 10 may be prohibited from changing. . In other words, when it is determined that the welding operator does not hold the welding torch 60, the change of the welding conditions of the welding machine 10 may be prohibited.

By doing so, it is possible to prevent unexpected changes in welding conditions. Thereby, occurrence of defective welding can be prevented. In addition, it is possible to improve the work safety of the welding operator.

Further, the welding machine 10 according to the present embodiment includes at least a welding torch 60 to which the acceleration sensor 310 is attached, and a power supply device 20 which is electrically connected to the welding torch 60 and supplies electric power for welding to the welding torch 60 .

The power supply device 20 includes a control unit 400 and a storage unit 500 , and the control unit 400 includes at least a calculation unit 410 , a determination unit 420 , and a welding control unit 430 .

The acceleration sensor 310 detects the acceleration of the welding torch 60 every predetermined time interval.

The storage unit 500 sequentially stores the acceleration in each axial direction of the welding torch 60 detected by the acceleration sensor 310 .

The calculation unit 410 calculates the moving average value _MAX of the acceleration A _X stored in the storage unit 500 .

The determination unit 420 counts the number of times E when the absolute value of the difference between the acceleration AX and the moving average value _MAX exceeds the threshold value _K during the predetermined period T. In addition, the determination unit 420 compares the number of times E when the number of detections N of the acceleration _AX and the absolute value of the difference between the acceleration _AX and the moving average value MAX exceeds the threshold value _K in the predetermined period T, and the number of times of detection N is When the ratio (=E/N) to the number of times E is smaller than the predetermined value, it is determined that the welding operator is not holding the welding torch 60 .

The welding control unit 430 restricts the operation of the welding machine 10 when it is determined by the determination unit 420 that the welding operator is not holding the welding torch 60 .

According to the welding machine 10 of the present embodiment, as described above, it is possible to easily prevent a welding output from occurring at an unexpected timing due to a malfunction of the torch switch 64 or the like. Thereby, the work safety of a welding operator can be improved. In addition, it is possible to prevent occurrence of defective welding such as welding of the workpiece W at an unexpected position.

In addition, when it is determined by the determination part 420 that the welding operator is not holding the welding torch 60 , the welding control unit 430 disables the operation of the torch switch 64 and restricts the operation of the welding machine 10 . Thereby, it is possible to reliably achieve prevention of occurrence of welding output at an unexpected timing, improvement of work safety of a welding operator, and prevention of occurrence of defective welding.

In addition, the calculation unit 410 may calculate the standard deviation SD _X of the acceleration _AX during the period T based on the acceleration _{AX stored in the storage unit 500 , and the determination unit 420 may determine the difference between the acceleration AX and the standard deviation SD X during the} period T The number of times F is counted when the absolute value of the exceeds the threshold value K1. In addition, the determination unit 420 may compare the number of times N of detections N of the acceleration _{AX and the number of times F when the absolute value of the difference between the acceleration AX and the standard deviation SD X exceeds the} threshold value K1 in the period T, and the number of detections N and When the ratio (=F/N) of the number of times F is smaller than the predetermined value, it is determined that the welding operator does not hold the welding torch 60 .

<Variation>

FIG. 6 shows a schematic configuration diagram of functional blocks of a power supply device and a welding torch according to a modification.

The configuration shown in FIG. 6 is different from the configuration shown in FIG. 4 in that a calculation unit 610 , a determination unit 620 , and a storage unit 500 are provided in the torch 60 . Note that the functions of the calculation unit 610 and the judgment unit 620 are the same as those of the calculation unit 410 and the judgment unit 420 shown in FIG. 4 .

In addition, when the output signal of the sensor unit 300 is sent to the control unit 400 provided in the power supply device 20, the communication unit 630 is provided in the welding torch 60, and the signal is transmitted from the communication unit 630 to the welding control of the control unit 400 as an insulating signal. Section 430.

According to the present modification, the same effects as those obtained by the configuration shown in the embodiment can be achieved. In other words, it is possible to prevent the occurrence of unexpectedly timed welding output, improve the work safety of the welding operator, and prevent the occurrence of defective welding. In addition, it is possible to prevent unexpected changes in welding conditions, prevent occurrence of defective welding, and improve the work safety of the welding operator.

Furthermore, according to this modification, the acceleration and angular velocity of each axial direction of the welding torch 60 can be accurately calculated. When the torch cable 41 including the control cable 50 is very long, if the output signal of the sensor unit 300 is small, the passivation of the signal transmitted through the control cable 50 and input to the control unit 400 increases, It may be difficult to accurately calculate the acceleration and angular velocity of the welding torch 60 in each axial direction. In the above case, by providing the calculation unit 610 , the determination unit 620 , and the storage unit 500 in the welding torch 60 , it is possible to eliminate the passivation of the signal in the control cable 50 and accurately calculate the acceleration in each axial direction of the welding torch 60 . , angular velocity.

In addition, the calculation unit 410 and the determination unit 420 may be integrated into the signal processing unit 330 . In addition, the communication unit 630 may be a functional block that transmits and receives wireless signals. In this case, a wireless communication unit (not shown) is provided in the power supply device 20, and signals are exchanged between the communication unit 630 and the wireless communication unit.

In the present specification, the so-called consumable electrode type arc welding machine 10 using the welding wire 70 has been described as an example, but the arc welding machine 10 may be a non-consumable electric power such as TIG. Pole type arc welding machine. However, in this case, since the wire feeding device 30 is not required, electric power is directly supplied from the power supply device 20 to the welding torch 60 via the power cable 40 . In addition, instead of the wire feeding device 30, a welding rod or a filler feeding device may be arranged. In addition, the welding torch 60 is directly connected to the power supply device 20 through the control cable 50 .

Industrial Availability

The control method of the welding machine of the present disclosure can easily prevent the occurrence of welding output at an unexpected timing based on the acceleration of the welding torch, and the control method of the welding machine of the present disclosure is useful.

-Symbol Description-

10 Arc Welding Machine (Welding Machine)

20 Power supply unit

30 wire feeder

31 Motor

40 Power cables

41 Torch cable

42 Workpiece cable

50 Control cables

60 torch

61 Torch body

62 head

63 Torch holder

64 Torch switch

70 welding wire

80 cylinders

81 Gas hose

100 display

200 Operation Department

300 Sensor Section

310 Accelerometer

320 Angular Velocity Sensor

330 Signal Processing Section

400 Control Department

410, 610 Operation Department

420, 620 Judgment Department

430 Welding Control Department

500 Storage

630 Communications Department

W Workpiece (welding object).

Claims (4)

1. A control method for a welding machine having a welding torch with an acceleration sensor attached thereto, comprising:

a step 1 of detecting acceleration of the welding torch at predetermined time intervals;

a step 2 of calculating a moving average of the acceleration for a predetermined period using the acceleration detected in the step 1; and

and a 3 rd step of comparing the number of times of detection of the acceleration in the predetermined period with the number of times of a case where an absolute value of a difference between the acceleration and the moving average value in the predetermined period exceeds a predetermined threshold value, and restricting the operation of the welding machine when a ratio of the number of times of detection to the number of times is smaller than a predetermined value.

2. A control method for a welding machine having a welding torch with an acceleration sensor attached thereto, comprising:

a step 1 of detecting acceleration of the welding torch at predetermined time intervals;

a 2 nd step of calculating a standard deviation of the acceleration for a predetermined period using the acceleration detected in the 1 st step; and

and a 3 rd step of comparing the number of times of detection of the acceleration in the predetermined period with the number of times of a case where an absolute value of a difference between the acceleration and the standard deviation in the predetermined period exceeds a predetermined threshold, and restricting an operation of the welding machine when a ratio of the number of times of detection to the number of times is smaller than a predetermined value.

3. The control method of a welder according to claim 1 or 2, wherein,

in the step 3, when a ratio of the number of detections to the number of times is less than a predetermined value, the operation of a torch switch provided in the welding torch is invalidated.

4. The control method of the welder of anyone of the claims 1 to 3, wherein,

the acceleration is an acceleration relating to movement of the welding torch in a plane including a longitudinal direction of the welding torch.

Images