JP7539001B2 - How to control a welding machine - Google Patents

Description

The present disclosure relates to a method for controlling a welding machine, and in particular to a method for controlling a welding machine having a welding torch that is manually operated by a welding operator.

Conventionally, there is known a technique for attaching a sensor such as an acceleration sensor to a welding torch that is manually operated by a welding worker, and controlling arc welding based on the output signal from the sensor (see, for example, Patent Documents 1 to 3).

JP 2013-066906 A JP 2013-223879 A International Publication No. 2019/202854

However, in arc welding, where the welding torch is operated manually, the welding machine may operate at an unintended time due to incorrect operation of the welding torch, resulting in welding output. In such cases, not only does the welding work become unsafe, but it may also lead to poor welding or reduced welding quality.

However, the conventional configurations disclosed in Patent Documents 1 and 2 do not disclose any technology to prevent the welding machine from operating at unintended times.

On the other hand, Patent Document 3 discloses that when the current flowing through the welding torch is below a predetermined value and an acceleration sensor and an angular velocity sensor detect that the tip of the welding torch has not moved for a predetermined period of time, the operation of the torch switch provided on the welding torch is disabled.

However, the configuration disclosed in Patent Document 3 requires multiple items to be detected, making signal processing and control complicated.

This disclosure has been made in consideration of these points, and its purpose is to provide a method for controlling a welding machine that can easily prevent the welding machine from operating at unintended times.

In order to achieve the above object, the method of controlling a welding machine disclosed herein is a method of controlling a welding machine having a welding torch equipped with an acceleration sensor, and is characterized by comprising: a first step of detecting the acceleration of the welding torch at a predetermined time interval; a second step of calculating a moving average value of the acceleration in a predetermined period using the acceleration detected in the first step; and a third step of comparing the number of times that the acceleration is detected in the predetermined period with the number of times that the absolute value of the difference between the acceleration in the predetermined period and the moving average value exceeds a predetermined threshold value, and restricting the operation of the welding machine if the ratio of the number of times that the acceleration is detected to the number of times is less than a predetermined value.

According to the present disclosure, it is possible to easily prevent the welding machine from operating at unintended times. It also improves the work safety of the welding operator.

FIG. 1 is a schematic diagram showing a configuration of an arc welder according to an embodiment. FIG. 2 is a schematic diagram showing the appearance of a welding torch. FIG. 3 is a schematic diagram showing the internal structure of the welding torch. FIG. 4 is a schematic diagram of the functional blocks of the power supply device and the welding torch. FIG. 5 shows an example of the change over time in acceleration of the welding torch in the X-axis direction. FIG. 6 is a schematic diagram of functional blocks of a power supply device and a welding torch according to a modified example.

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature and is not intended to limit the present disclosure, its application, or its uses.

(Embodiment)
[Configuration of Arc Welding Machine and Configuration of Welding Torch]
Fig. 1 shows a schematic diagram of the configuration of an arc welder according to this embodiment, Fig. 2 shows a schematic diagram of the external appearance of a welding torch, and Fig. 3 shows a schematic diagram of the internal structure of the welding torch.

As shown in Fig. 1, an arc welding machine 10 (hereinafter, sometimes simply referred to as the welding machine 10) includes a power supply unit 20, a wire feeder 30, and a welding torch 60. A shielding gas, for example, _CO2 gas, is supplied to the welding torch 60 from a gas cylinder 80 via a gas hose 81 and the wire feeder 30. The shielding gas is supplied with a pressure and flow rate adjusted by a flow rate regulator (not shown) to a predetermined value. The gas hose 81 is housed inside a torch cable 41, and a power cable 40 and a control cable 50 (described later) are also housed inside the torch cable 41.

The power supply unit 20 has a power cable 40 connected to one of the output terminals 21 and a work cable 42 connected to the other, and power for welding is supplied from the power cable 40 to the welding torch 60. Specifically, a welding current is supplied to the welding wire 70 passing through the welding torch 60 via the power cable 40 housed in the torch cable 41 and connected to the welding torch 60 and a welding tip (not shown). The power supply unit 20 is also configured to send control signals to the wire feeder 30 to control the wire feed speed and the welding current flowing through the welding wire 70. The functions and internal functional block configuration of the power supply unit 20 will be described later.

The wire feeder 30 is composed of a wire feed mechanism (not shown) and a motor 31 that drives the wire feed mechanism, and feeds the welding wire 70 toward the workpiece (object to be welded) W at a predetermined speed in response to a control signal from the power supply 20. It also supplies shielding gas from a gas cylinder 80 to the welding torch 60. The shielding gas may be supplied directly to the welding torch 60 via a flow regulator.

The control cable 50 is connected to the power supply unit 20 and the wire feeder 30, and is configured to send a control signal to control the wire feed speed of the welding wire 70 as described above, and to transmit and receive various signals between the power supply unit 20 and various devices provided in the welding torch 60. In addition, the driving power of the various devices provided in the welding torch 60 is supplied via the control cable 50. In addition, the control cable 50 is configured to send an operation signal of the torch switch 64, which determines whether to start or stop welding, to the power supply unit 20.

2 and 3, the welding torch 60 has a torch body 61, a torch holder 63, a torch switch 64, and a head 62. The welding torch 60 also holds a welding wire 70 therein, and the welding wire 70 is fed from the tip of the head 62 toward the workpiece W.

As shown in FIG. 2, the torch holder 63 has a display unit 100 and an operation unit 200 arranged thereon, and the display unit 100 is composed of a display device such as a liquid crystal display or an organic EL display. The display unit 100 displays various information such as welding conditions. The operation unit 200 is composed of a device such as an operation button (not shown), and outputs an operation signal to various devices provided on the welding torch 60 or to the power supply unit 20 when operated by a welding operator. For example, the display/non-display of the display unit 100 can be switched by operating the operation unit 200. Note that if 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.

3, a sensor unit 300 is attached inside the torch holder 63 and is electrically connected to the control cable 50 passing through the torch cable 41 via a wiring 65. 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 torch cable 41 via a wiring 66. By operating the torch switch 64, that is, by pressing the torch switch 64, the welding start state, that is, the ON state in which the wire feeder 30 is activated and the welding current flows through the welding wire 70, and the welding stop state, that is, the OFF state in which the supply of the welding current is stopped and the wire feeder 30 is also stopped, are switched over. However, as will be described later, the operation of the torch switch 64 is effective only when it is determined that the welding operator is holding the welding torch 60 based on the detection result of the sensor unit 300.

[Function block configuration of power supply device and welding torch]
Fig. 4 shows a schematic diagram of the functional blocks of the power supply device and the welding torch, and Fig. 5 shows an example of the change in acceleration of the welding torch in the X-axis direction over time. Although not shown, as described above, the control cable 50 is connected to the power supply device 20 and the welding torch 60 via the wire feeder 30.

As shown in Figures 2 to 4, the welding 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 that is composed of an acceleration sensor 310, an angular velocity sensor 320, and a signal processing unit 330 that processes the outputs of the acceleration sensor 310 and the angular velocity sensor 320, and is 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 three mutually orthogonal axes (X-axis, Y-axis, and Z-axis shown in FIG. 2) in a three-dimensional space. In other words, the sensor unit 300 is a so-called six-axis sensor. The signal processing unit 330 is composed of an IC or an LSI. The sensor unit 300 detects the acceleration and angular velocity in each axial direction of the welding torch 60 and their changes. These values are detected at predetermined time intervals. The sensor unit 300 also detects the movement speed and movement of the tip of the welding torch 60 from the changes in acceleration and angular velocity in each axial direction and the difference in position between the sensor unit 300 and the tip of the head 62, which is the tip of the welding torch 60, which is a predetermined position.

Furthermore, 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 digitization of the analog output signals. In this embodiment, the acceleration sensor 310, the angular velocity sensor 320, and the signal processing unit 330 are integrated in one package, but each may be prepared separately and mounted on a printed circuit board. Of the sensor unit 300, the detection signal of the acceleration sensor 310 is used to determine whether the operation of the torch switch 64, which will be described later, is valid/invalid.

On the other hand, the power supply unit 20 is provided with a control unit 400 and a memory unit 500, and the control unit 400 has at least a calculation unit 410, a judgment unit 420, and a welding control unit 430.

The control unit 400 is a functional block realized by executing a specific software on a microcomputer or LSI, and the same is true for the calculation unit 410, judgment unit 420, and welding control unit 430 included therein. The calculation unit 410, judgment unit 420, and welding control unit 430 may each be implemented on a different LSI.

Of the control unit 400, the welding control unit 430 controls the wire feed speed of the welding wire 70 fed from the wire feeder 30. The welding control unit 430 also controls the welding output, i.e., the welding current and welding voltage flowing through the welding wire 70.

The calculation unit 410 performs various calculation processes based on the signal output from the signal processing unit 330 of the sensor unit 300, i.e., the detection values of the acceleration sensor 310 and the angular velocity sensor 320. For example, the calculation unit 410 calculates the speed and amplitude of the tip of the welding torch 60, the attitude of the welding torch 60, etc.

The memory unit 500 stores welding conditions, such as a set voltage and a set current, and a wire feed speed corresponding thereto. The memory unit 500 also 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 A _x in the X-axis direction (hereinafter, simply referred to as acceleration A _x ) will be mainly described. The calculation unit 410 calculates a moving average value _MAX of the acceleration A _x (hereinafter, simply referred to as moving average value MAX _x ) based on the acceleration A _x stored in the memory unit 500. Here, the moving average value is a value obtained by shifting the average value for each preset fixed period. In this embodiment, this fixed period is the period T shown in FIG. 5.

The determination unit 420 counts the number of times E that the acceleration A _x exceeds the moving average value _MAX ± the threshold value K during the period T, in other words, the number of times E that the absolute value of the difference between the acceleration A _x and the moving average value _MAX exceeds the threshold value K. Here, the threshold value K is a positive value.

As shown in Fig. 5, the acceleration A _x may vary significantly over time. For example, when a welding operator holds the welding torch 60 in his/her hand, the welding torch 60 moves irregularly, sometimes significantly, due to hand shake. This movement is reflected in the acceleration A _x , and as shown in Fig. 5, the acceleration A _x may exceed the moving average value _MAX ± threshold value K in a given period T. The value of threshold value K is set appropriately according to the range of the output signal of the acceleration sensor 310 caused by hand shake. Therefore, the size and weight of the welding torch 60 also affect the setting of threshold value K.

The determination unit 420 also compares the number of detections N of the acceleration _AX during a predetermined period T with the aforementioned number of detections E, and if the ratio (=E/N) of the number of detections N to the number of detections E is less than a predetermined value, it determines that the welding operator is not holding the welding torch 60 in his/her hand, and if the ratio is equal to or greater than the predetermined value, it determines that the welding operator is holding the welding torch 60 in his/her hand. In this embodiment, the predetermined value is set to 0.5, but is not limited to this and may be any other value as appropriate. The number of detections N is 100, but is not limited to this and may be any other value as appropriate.

If the judgment unit 420 judges that the welding operator is not holding the welding torch 60 in his/her hand, the welding control unit 430 disables the operation of the torch switch 64. Therefore, even if the torch switch 64 is pressed in this state, the wire feeder 30 does not operate and no welding current flows through the welding wire 70. In other words, the operation of the arc welder 10 is restricted.

On the other hand, when the judgment unit 420 judges that the welding operator is holding the welding torch 60 in his/her hand, the welding control unit 430 enables the operation of the torch switch 64. Therefore, the operational restrictions on the arc welder 10 are lifted. In this state, when the torch switch 64 is pressed, the wire feeder 30 is activated, and a predetermined welding current flows through the welding wire 70, starting the welding operation.

[Effects, etc.]
As described above, the method for controlling a welding machine according to this embodiment is a method for controlling a welding machine 10 having a welding torch 60 to which an acceleration sensor 310 is attached.

This control method includes a first step of detecting the acceleration A _x of the welding torch 60 at a predetermined time interval, and a second step of calculating a moving average value _MAX of the acceleration A _x using the acceleration A _x detected in the first step.

The method further includes a third step of comparing the number of detections N of the acceleration _Ax in a predetermined period T with the number of detections E of the cases where the absolute value of the difference between the acceleration _Ax and the moving average value _Ax exceeds a threshold value K in the predetermined period T, and restricting the operation of the arc welder 10 if the ratio (=E/N) of the number of detections N to the number of detections E is less than a predetermined value.

According to this embodiment, the operation of the welding machine 10 is restricted based on the acceleration A _x and the average moving value _MAX of the welding torch 60, so that it is possible to easily prevent welding output from being generated at an unintended timing due to a malfunction of the torch switch 64, etc. This improves the work safety of the welding operator. Also, it is possible to prevent the occurrence of poor welding, such as welding at an unintended location on the workpiece W.

Also, unlike the configuration disclosed in Patent Document 3, the item to be detected in determining whether or not the operation of the welding machine 10 should be restricted is the acceleration _Ax , and therefore the calculation process for the determination is simplified.

Furthermore, when judging the operational restriction of the welding machine 10, the accuracy of the judgment can be improved by using the moving average value MAX of the acceleration _AX instead of directly using the acceleration _AX .

As is conventionally known, the output signal of the acceleration sensor 310 has temperature dependency, which varies with temperature. Therefore, when the temperature of the surrounding environment varies, the acceleration detected by the acceleration sensor 310 also varies. In addition, since there are individual differences in the acceleration sensors 310, these individual differences cause variations in the acceleration detected by the acceleration sensor 310 between different welding machines 10. Furthermore, the acceleration detected by the acceleration sensor 310 also varies due to mounting errors when mounting the acceleration sensor 310 on a mounting board (not shown) or mounting errors when attaching the sensor unit 300 to the torch holder 63.

As described above, there are many factors that cause fluctuations in the output signal of the acceleration sensor 310, in other words, the acceleration detected by the acceleration sensor 310. Therefore, if the acceleration _Ax is directly used to determine whether or not the operational restriction of the welding machine 10 should be applied, there is a risk that the accuracy of the determination of the operational restriction of the welding machine 10 will decrease due to the variation in the detection of the acceleration _Ax .

On the other hand, according to the present embodiment, the use of the moving average value _MAX reduces the influence of the above-mentioned fluctuation factors, so that it is possible to determine with high accuracy whether or not the operation of the welding machine 10 needs to be restricted.

The determination unit 420 may count the following number of times F instead of the number of times E. The number of times F is the number of times when the absolute value of the difference between the acceleration A _{1 X} in a predetermined period T and the standard deviation SD _{1 X of} the acceleration A 1 _X in the predetermined period T (hereinafter simply referred to as standard deviation SD _{1 X} ) exceeds a threshold value K1. In this case, in the third step, the number of times N of detection of the acceleration A 1 _X in the predetermined period T is compared with the number of times F of the absolute value of the difference between the acceleration A 1 _X and the standard deviation SD 1 _X in the predetermined period T, and if the ratio (=F/N) of the number of times N of detection to the number of times F is less than a predetermined value, the operation of the welding machine 10 is restricted.

In this way, as in the case of using the number of times E, it is possible to easily prevent welding output from occurring at unintended timing. It goes without saying that this also improves the work safety of the welding operator and prevents the occurrence of welding defects. Note that threshold value K1 is a different value from threshold value K. However, they may be the same value.

Alternatively, the operation of welding machine 10 may be restricted by a different method. For example, when standard deviation _SDX in a predetermined period T is equal to or smaller than a predetermined threshold value, determination unit 420 may determine that the welding operator is not holding welding torch 60 in his/her hand, and may restrict the operation of welding machine 10.

In the third step, if the ratio of the detection count N to the count E or the count F is less than a predetermined value, the operation of the torch switch 64 provided on the welding torch 60 is disabled.

In this way, even if the torch switch 64 is operated, welding will not start, and the operation of the welding machine 10 can be reliably restricted. This not only prevents welding output from occurring at unintended times, but also improves the work safety of the welding operator and prevents poor welding.

In the present embodiment, the acceleration _AX in the X-axis direction of the welding torch 60 and its moving average value _MAX are used to limit the operation of the welding machine 10, but the present invention is not limited to this, and for example, the acceleration _AY in the Y-axis direction, the acceleration _AZ in the Z-axis direction, and their moving average values may be used. Also, the square root of the sum of the squares of the accelerations _AX , _AY , and _AZ in each axis direction may be used.

Note that movement of welding torch 60 due to hand shake is more likely to occur in a plane including the Y-axis direction, which is the longitudinal direction of welding torch 60, than in the Z-axis direction. Therefore, by using acceleration A _{2 X} in the X-axis direction or acceleration A 2 _Y in the Y-axis direction, hand shake, and therefore whether or not the welding operator is holding welding torch 60 in his/her hand, can be determined with high accuracy, and the accuracy of determining operational restrictions on welding machine 10 can be improved.

In addition, in the present embodiment, an example has been 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 detections E or the number of detections F is less than a predetermined value, but, for example, it may be possible to prohibit changes to the welding conditions of the welding machine 10. In other words, if it is determined that the welding operator is not holding the welding torch 60 in his/her hand, it may be possible to prohibit changes to the welding conditions of the welding machine 10.

This prevents unintended changes to welding conditions, which in turn prevents welding defects. It also improves the safety of the welding worker.

In addition, the welding machine 10 according to this embodiment includes at least a welding torch 60 having an acceleration sensor 310 attached thereto, and a power supply unit 20 electrically connected to the welding torch 60 and supplying power for welding to the welding torch 60.

The power supply unit 20 has a control unit 400 and a memory unit 500, and the control unit 400 has at least a calculation unit 410, a judgment unit 420, and a welding control unit 430.

The acceleration sensor 310 detects the acceleration of the welding torch 60 at predetermined time intervals.

The memory unit 500 sequentially stores the acceleration of the welding torch 60 in each axial direction 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 A _{1 X} and the moving average value _MAX exceeds the threshold value K during a predetermined period T. The determination unit 420 also compares the number of times N when the acceleration A 1 _X is detected with the number of times E when the absolute value of the difference between the acceleration A 1 _X and the moving average value _MAX exceeds the threshold value K during the predetermined period T, and determines that the welding operator is not holding the welding torch 60 in his/her hand if the ratio (= E/N) of the number of times N when the detection is performed to the number of times E is less than a predetermined value.

The welding control unit 430 limits the operation of the welding machine 10 when the judgment unit 420 determines that the welding operator is not holding the welding torch 60 in his/her hand.

As described above, the welding machine 10 of this embodiment can easily prevent welding output from occurring at an unintended timing due to malfunction of the torch switch 64, etc. This improves the work safety of the welding operator. In addition, it can prevent poor welding, such as welding at an unintended location on the workpiece W.

In addition, when the determination unit 420 determines that the welding operator is not holding the welding torch 60, the welding control unit 430 disables the operation of the torch switch 64 to limit the operation of the welding machine 10. This prevents the generation of welding output at unintended times, improves the working safety of the welding operator, and reliably prevents the occurrence of poor welding.

The calculation unit 410 may calculate the standard deviation SD _X of the acceleration A _{X during the period T based on the acceleration A X stored} in the storage unit 500, and the determination unit 420 may count the number of times F when the absolute value of the difference between the acceleration A _X and the standard deviation SD _X exceeds the threshold value K1 during the period T. The determination unit 420 may compare the number of times N when the acceleration A _X is detected with the number of times F when the absolute value of the difference between the acceleration A _X and the standard deviation SD _X exceeds the threshold value K1 during the period T, and determine that the welding operator is not holding the welding torch 60 in his/her hand if the ratio (=F/N) of the number of times N when the detection is performed is less than a predetermined value.

<Modification>
FIG. 6 is a schematic diagram showing the functional blocks of a power supply device and a welding torch according to a modified example.

The configuration shown in Fig. 6 differs from the configuration shown in Fig. 4 in that the welding torch 60 is provided with a calculation unit 610, a judgment unit 620, and a memory unit 500. 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, in order to send the output signal of the sensor unit 300 to the control unit 400 provided in the power supply unit 20, a communication unit 630 is provided in the welding torch 60, and the signal is sent from the communication unit 630 to the welding control unit 430 of the control unit 400 as an insulated signal.

This modified example can achieve the same effects as the configuration shown in the embodiment. In other words, it is possible to prevent the occurrence of welding output at unintended timing, improve the work safety of the welding operator, and prevent the occurrence of poor welding. It is also possible to prevent unintended changes to welding conditions, prevent the occurrence of poor welding, and improve the work safety of the welding operator.

Furthermore, according to this modified example, the acceleration and angular velocity of the welding torch 60 in each axial direction 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 signal transmitted through the control cable 50 and input to the control unit 400 becomes increasingly rounded, making it difficult to accurately calculate the acceleration and angular velocity of the welding torch 60 in each axial direction. In such a case, by providing the welding torch 60 with a calculation unit 610, a determination unit 620, and a memory unit 500, the signal rounding in the control cable 50 can be eliminated, and the acceleration and angular velocity of the welding torch 60 in each axial direction can be accurately calculated.

The signal processing unit 330 may incorporate the calculation unit 410 and the judgment unit 420 into one body. The communication unit 630 may be a functional block that transmits and receives wireless signals. In that 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 this wireless communication unit.

In this specification, a so-called consumable electrode type arc welder 10 using a welding wire 70 has been described as an example, but the arc welder 10 may be a non-consumable electrode type arc welder such as TIG. In that case, however, the wire feeder 30 is not necessary, and power is supplied directly to the welding torch 60 from the power supply 20 via the power cable 40. A welding rod or filler metal feeder may be arranged in place of the wire feeder 30. The welding torch 60 is also directly connected to the power supply 20 by the control cable 50.

The welding machine control method disclosed herein is useful because it can easily prevent welding output from occurring at unintended times based on the acceleration of the welding torch.

10. Arc welding machine (welding machine)
20 Power supply device 30 Wire feeder 31 Motor 40 Power cable 41 Torch cable 42 Work cable 50 Control cable 60 Welding torch 61 Torch body 62 Head 63 Torch holder 64 Torch switch 70 Welding wire 80 Gas cylinder 81 Gas hose 100 Display unit 200 Operation unit 300 Sensor unit 310 Acceleration sensor 320 Angular velocity sensor 330 Signal processing unit 400 Control unit 410, 610 Calculation unit 420, 620 Determination unit 430 Welding control unit 500 Memory unit 630 Communication unit W Work (object to be welded)

Claims (4)

A method for controlling a welding machine having a welding torch equipped with an acceleration sensor, comprising the steps of:
A first step of detecting an acceleration of the welding torch at predetermined time intervals;
a second step of calculating a moving average value of the acceleration during a predetermined period using the acceleration detected in the first step;
a third step of comparing a number of times that the acceleration is detected during the predetermined period with a number of times that an absolute value of a difference between the acceleration and the moving average value exceeds a predetermined threshold value during the predetermined period, and restricting the operation of the welding machine if a ratio of the number of times that the acceleration is detected to the number of times is less than a predetermined value;
A method for controlling a welding machine comprising: A method for controlling a welding machine having a welding torch equipped with an acceleration sensor, comprising the steps of:
A first step of detecting an acceleration of the welding torch at predetermined time intervals;
a second step of calculating a standard deviation of the acceleration during a predetermined period of time using the acceleration detected in the first step;
a third step of comparing a number of times the acceleration is detected within the predetermined period with a number of times an absolute value of a difference between the acceleration and the standard deviation exceeds a predetermined threshold within the predetermined period, and restricting operation of the welding machine if a ratio of the number of times the acceleration is detected to the number of times is less than a predetermined value;
A method for controlling a welding machine comprising: 3. The method for controlling a welding machine according to claim 1, further comprising:
The welding machine control method is characterized in that, in the third step, when the ratio of the number of detections to the number of times is less than a predetermined value, operation of a torch switch provided on the welding torch is invalidated. 4. The method for controlling a welding machine according to claim 1, further comprising:
A method for controlling a welding machine, wherein the acceleration is an acceleration related to the movement of the welding torch within a plane including a longitudinal direction of the welding torch.

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