JP7670560B2 - Wire feeding system and wire feeding method - Google Patents

Description

The present invention relates to a wire feeding system and a wire feeding method.

Generally, when performing arc welding, slag is generated on the metal surface, and this slag can affect the finished weld or prevent the arc from being generated. For this reason, when performing arc welding, the slag that is generated is removed.

Patent document 1 discloses a technology in which, in a slag removal process, slag is removed by periodically repeating high-speed back and forth movements of the welding wire, and the slag removal process is terminated when a short circuit between the welding wire and the workpiece is detected by a short circuit monitoring unit.

Patent No. 5230600

However, with the technology disclosed in Patent Document 1, the repeated, cyclical, high-speed back-and-forth movement of the welding wire causes wear at the tip of the tip and increases the load on the motor that moves the welding wire. As a result, there is a problem in that the lifespan of parts such as the tip and motor is shortened.

The present invention aims to provide a wire feeding system and a wire feeding method that reduce the shortening of the lifespan of components such as chips and motors.

The wire feeding system according to one aspect of the present invention includes a wire feeding unit that feeds a welding wire, a wire feeding control unit that controls the wire feeding unit to perform forward feeding, which feeds the welding wire in the forward direction, which is the direction of the base material, or forward and reverse feeding, which feeds the welding wire repeatedly in the forward and reverse directions, and a detection unit that detects whether an arc starts during slow-down control that forward feeds the welding wire to generate an arc. If the detection unit detects that an arc has not started, the wire feeding control unit controls the wire feeding unit to perform forward and reverse feeding while continuing to apply a voltage to generate an arc.

According to this aspect, in the slow-down control in which the welding wire is forward-fed to generate an arc by the detection unit, if it is detected that an arc has not started, the wire feed control unit controls the wire feed unit to feed the welding wire forward and backward while continuing to apply voltage to generate an arc. This makes it possible to avoid placing an excessive load on the motor due to continued forward feeding of the welding wire, and to avoid damage caused by strong contact between the tip and the base material. As a result, it is possible to reduce the shortening of the lifespan of parts such as the tip and motor.

In the above aspect, when the wire feed control unit controls the wire feed unit to perform forward and reverse feed during slow-down control, the feed speed of the welding wire in the forward direction during the forward and reverse feed may be greater than the feed speed of the welding wire in the forward feed during slow-down control.

According to this aspect, in the slow-down control, the forward feed speed of the welding wire in the forward and reverse feed is greater than the forward feed speed of the welding wire, so that slag adhering to the tip of the welding wire and slag present between the welding wire and the base material can be properly removed.

In the above embodiment, in forward and reverse feeding, the amount of welding wire fed in the forward direction may be equal to or greater than the amount of welding wire fed in the reverse direction.

According to this aspect, in forward and reverse feeding, the amount of welding wire fed in the forward direction is equal to or greater than the amount of welding wire fed in the reverse direction, so that the tip at the end of the welding wire repeatedly comes into contact with the base material, and slag, etc. adhering to the end of the welding wire and slag, etc. present between the welding wire and the base material can be properly removed.

In the above embodiment, the wire feed control unit may control the wire feed unit to perform forward and reverse feed if an arc does not start within a predetermined time after the slowdown control is started.

According to this aspect, if an arc does not start within a predetermined time after the slow-down control is started, forward and reverse feed of the welding wire is started, so that forward feed of the welding wire is continued, preventing excessive load from being placed on the tip, motor, etc.

In the above aspect, the predetermined time may be calculated based on at least one of the history of when an arc has started or the history of when an arc has not started.

According to this aspect, the predetermined time is calculated based on at least one of the history of when an arc started or the history of when an arc did not start, so forward and reverse feeding of the welding wire can be started at a more appropriate timing depending on the welding machine, each part of the wire feeding system, and the type and performance of the welding wire, etc. This makes it possible to more appropriately avoid placing an excessive load on the motor by continuing the forward feeding of the welding wire, and to avoid damage caused by strong contact between the tip and the base material. As a result, it is possible to reduce the shortening of the lifespan of parts such as the tip and the motor.

The wire feeding method according to one aspect of the present invention is a wire feeding method executed by a wire feeding system that feeds welding wire, and includes a forward feeding step of feeding the welding wire in a forward direction toward the base material in a slow-down control for feeding the welding wire to generate an arc, a detection step of detecting whether an arc has started in the forward feeding step, and a forward/reverse feeding step of repeatedly feeding the welding wire in the forward and reverse directions while continuing to apply a voltage to generate an arc if it is detected in the detection step that an arc has not started.

According to this aspect, in the slow-down control for feeding the welding wire to generate an arc, if it is detected in the detection step that an arc has not started, the welding wire is fed repeatedly in the forward and reverse directions in the forward/reverse feed step while continuing to apply voltage to generate an arc. This makes it possible to avoid placing an excessive load on the motor by continuing to feed the welding wire in the forward direction, and to avoid damage caused by strong contact between the tip and the base material. As a result, it is possible to reduce the shortening of the lifespan of parts such as the tip and the motor.

The present invention provides a wire feeding system and a wire feeding method that reduce the shortening of the lifespan of components such as chips and motors.

1 is a block diagram illustrating a schematic configuration of a wire feeding system 1 according to an embodiment of the present invention. FIG. 2 is a diagram showing how a welding wire 4 is fed and an arc is started in the wire feeding system 1 according to an embodiment of the present invention. 1 is a flowchart showing a wire feeding method M100 executed by the wire feeding system 1 according to an embodiment of the present invention.

One embodiment of the present invention will be described in detail below with reference to the attached drawings. Note that the embodiment described below is merely a specific example for implementing the present invention, and is not intended to limit the interpretation of the present invention. In addition, to facilitate understanding of the description, the same components in each drawing are given the same reference numerals as much as possible, and duplicate descriptions may be omitted.

<One embodiment>
[Wire Feeding System Configuration/Function]
1 is a block diagram illustrating a schematic configuration of a wire feeding system 1 according to an embodiment of the present invention. The wire feeding system 1 is a system that feeds a welding wire 4 wound around a wire reel 2 to a welding torch 3 that performs arc welding. The wire feeding system 1 includes, for example, a wire feeding unit 10, a wire feeding control unit 20, and a detection unit 30. The wire feeding unit 10 includes a first wire feeding unit 11, a wire buffer 12, and a second wire feeding unit 13.

The first wire feeder 11 feeds the welding wire 4 wound on the wire reel 2 toward the welding torch 3. The first wire feeder 11 has, for example, a roller (not shown) that moves the welding wire 4 forward or backward, and a motor (not shown) that rotates the roller. The forward movement of the welding wire 4 means that the welding wire 4 moves toward the welding torch 3 (forward feed), and the backward movement of the welding wire 4 means that the welding wire 4 moves toward the wire reel 2 (reverse feed).

The motor rotates in a direction to advance or retreat the welding wire 4 according to instructions from the wire feed control unit 20.

For example, when welding, the first wire feeder 11 feeds the welding wire 4 in an advancing direction in accordance with instructions from the wire feed control unit 20. When calibrating, the first wire feeder 11 moves the welding wire 4 in an advancing or retracting direction in accordance with instructions from the wire feed control unit 20.

The second wire feeder 13 feeds the welding wire 4 stored in the wire buffer 12 to the welding torch 3. The second wire feeder 13 has a roller and a motor, similar to the first wire feeder 11 described above. Details of the roller and the motor are omitted.

For example, when welding, the second wire feeder 13 feeds the welding wire 4 to the welding torch 3 while repeatedly moving the welding wire 4 forward and backward at high speed relative to the base material in accordance with instructions from the wire feed control unit 20 (forward and reverse feed). Also, when calibrating, the second wire feeder 13 moves the welding wire 4 in the forward or backward direction in accordance with instructions from the wire feed control unit 20.

The wire buffer 12 is provided between the first wire feeder 11 and the second wire feeder 13, and absorbs the difference in the amount of welding wire 4 fed by the first wire feeder 11 and the second wire feeder 13. The wire buffer 12 allows the welding wire 4 to be fed smoothly in either the forward or backward direction.

The wire feed control unit 20 is physically configured, for example, by a control unit including a processor, memory, and a communication interface. The wire feed control unit 20 realizes the function of controlling the wire feed unit 10 to feed the welding wire 4 in an advancing direction, a retracting direction, or repeatedly in an advancing direction and a retracting direction, by the processor executing a predetermined program stored in the memory.

The detection unit 30 detects whether an arc starts during slow-down control, which feeds the welding wire 4 in the forward direction to generate an arc. For example, when welding, the welding torch 3 is moved to the welding start position and the welding wire 4 is fed, but slow-down control is performed until an arc is generated. During slow-down control, the welding wire 4 is fed at a slower speed than the feeding speed at which the welding wire 4 is fed during welding.

Normally, the wire feed control unit 20 moves the welding torch 3 to the welding start position, and in slow-down control, controls the wire feed unit 10 to feed the welding wire 4 in the normal direction, and generates an arc by bringing the tip of the welding wire 4 into contact with the base material. Here, even though an arc should be generated if the tip of the welding wire 4 is in normal contact with the base material, there are cases in which an arc does not actually start, and the detection unit 30 detects that an arc has not started.

For example, the detection unit 30 detects whether an arc starts during slow-down control in which the welding wire 4 is forward-fed to generate an arc by monitoring the load on the motor. The welding wire 4 is fed by driving the motor, but if the tip of the welding wire 4 comes into contact with the base material directly or indirectly and the feeding of the welding wire 4 continues, the load on the motor increases. In other words, if an arc does not start even when the load on the motor reaches a threshold value, the detection unit 30 may detect that the tip of the welding wire 4 and the base material are not in normal contact, for example, because slag or the like is interposed between the tip of the welding wire 4 and the base material, and that an arc does not start during slow-down control in which the welding wire 4 is forward-fed to generate an arc.

To determine whether an arc has started, the detection unit 30 typically detects a short circuit, which is electrical contact between the welding wire 4 and the base material. The detection unit 30 may be anything that can detect the start of an arc by detecting a short circuit between the welding wire 4 and the base material, but it may be realized, for example, by using a short circuit determination circuit that detects a voltage signal (voltage value, voltage waveform) or a current signal (current value, current waveform), etc. to determine the presence of a short circuit.

The wire feed control unit 20 determines the method of feeding the welding wire 4 based on the detection status and detection results of the detection unit 30. For example, when the welding wire 4 is fed forward and the detection unit 30 detects that an arc has not started, the wire feed control unit 20 controls the wire feed unit 10 to feed forward and backward while continuing to apply a voltage to generate an arc. This is described in detail below.

[Welding wire feed control in wire feed system]
2 is a diagram showing how the welding wire 4 is fed and an arc is started in the wire feeding system 1 according to one embodiment of the present invention. For example, when performing welding, the welding torch 3 is moved to a welding start position and the welding wire 4 is fed, but slow-down control is performed until an arc is generated.

As shown in FIG. 2, first, the welding wire 4 is fed from the welding torch 3 in the forward direction, which is the direction of the base material (forward feed). Specifically, the wire feed control unit 20 controls the wire feed unit 10 to feed the welding wire 4 in the forward direction from the welding torch 3. As described with reference to FIG. 1, the wire feed unit 10 drives a motor that rotates a roller in a direction that advances the welding wire 4 according to instructions from the wire feed control unit 20, thereby forward feeding the welding wire 4.

In slow-down control, the tip of the welding wire 4, which is slowly fed in the direction of the base material, reaches the base material, and if electrical contact (short circuit) occurs between the welding wire 4 and the base material at this point, an arc is generated. However, for example, due to the influence of slag, etc., electrical contact (short circuit) between the welding wire 4 and the base material may not occur, and an arc may not be generated.

In other words, it may appear that the tip of the welding wire 4 has reached the base material, but strictly speaking, due to factors such as the presence of slag between the welding wire 4 and the base material, the detection unit 30, which is a short circuit determination circuit, may not detect that the welding wire 4 and the base material have made electrical contact (short circuit).

In this way, in the slow-down control in which the welding wire 4 is fed forward to generate an arc, if the welding wire 4 continues to be fed forward without starting an arc, the load on the motor will increase further.

When the load on the motor increases and reaches a preset threshold, the welding wire 4 is fed from the welding torch 3 in a forward direction toward the base material and in a reverse direction opposite thereto (forward and reverse feed). Specifically, the wire feed control unit 20 controls the wire feed unit 10 to feed the welding wire 4 from the welding torch 3 in a forward and reverse direction. As described with reference to FIG. 1, the wire feed unit 10 drives the motor that rotates the roller to feed the welding wire 4 forward and backward in accordance with an instruction from the wire feed control unit 20. At this time, the forward and reverse feed of the welding wire 4 in the slowdown control is performed in a state in which a voltage for generating an arc is continuously applied. The voltage for generating an arc is output by, for example, a welding power source unit (not shown) that may be included in the wire feed system 1. The welding power source unit may be provided separately and distributed as a welding power source device.

As described above, the slowdown control is performed until an arc is generated, so even during this forward/reverse feed, the welding wire 4 is fed forward/reverse at a slower speed than the feed speed at which the welding wire 4 is fed during welding.

Now, forward and reverse feed during slowdown control will be described in detail. Forward and reverse feed involves repeating forward feed in the direction in which the welding wire 4 approaches the base material (forward direction, forward advance) and reverse feed in the direction in which the welding wire 4 moves away from the base material (reverse direction, backward), but the feed amount of the welding wire 4 during forward feed and the feed amount of the welding wire 4 during reverse feed are set to be the same.

If the feed rate of the welding wire 4 differs between forward and reverse feed, for example if the feed rate of the welding wire 4 in reverse feed is greater than the feed rate of the welding wire 4 in forward feed, the distance between the tip of the welding wire 4 and the base material increases. This may mean that slag adhering to the tip of the welding wire 4 and slag present between the welding wire 4 and the base material cannot be removed. In other words, slag that is preventing electrical contact between the welding wire 4 and the base material cannot be removed, and an arc does not start.

Even if the vibration caused by forward and reverse feed could remove slag and other materials adhering to the tip of the welding wire 4, the distance between the tip of the welding wire 4 and the base material would increase, and the welding wire 4 would no longer come into physical contact with the base material during forward and reverse feed. No electrical contact (short circuit) would occur, and no arc would start.

In addition, in forward and reverse feed, for example, if the welding wire 4 is fed forward and the tip of the welding wire 4 comes into contact with the base material, the tip of the welding wire 4 presses the surface of the base material. In this case, even if the feed amount of the welding wire 4 in forward feed and the feed amount of the welding wire 4 in reverse feed are set to be the same, the amount of movement in the reverse direction may actually be greater than the amount of movement in the forward direction. As a result, the distance between the tip of the welding wire 4 and the base material increases in forward and reverse feed, so that the welding wire 4 and the base material do not physically come into contact with each other in the forward and reverse feed. In other words, in order to properly bring the welding wire 4 into contact with the base material in forward and reverse feed, it may be preferable to set the feed amount of the welding wire 4 in forward feed to be greater than the feed amount of the welding wire 4 in reverse feed.

When the amount of welding wire 4 fed in forward feed is greater than the amount of welding wire 4 fed in reverse feed, the welding wire 4 and the base material are appropriately brought into contact with each other in forward and reverse feed, improving the possibility of removing slag, etc., adhering to the tip of the welding wire 4 and slag, etc., present between the welding wire 4 and the base material. In forward and reverse feed, the welding wire 4 is repeatedly brought into contact with the base material, and the slag, etc., adhering to the tip of the welding wire 4 and the slag, etc., adhering to the surface of the base material can be cracked and removed by, for example, the vibration and impact of the contact. However, if the amount of welding wire 4 fed in forward feed is too much greater than the amount of welding wire 4 fed in reverse feed, the contact between the tip of the welding wire 4 and the base material becomes strong, which may damage the tip and the base material.

Therefore, in forward and reverse feed under slowdown control, it is preferable that the feed amount of the welding wire 4 in forward feed and the feed amount of the welding wire 4 in reverse feed are the same or almost the same, and the feed amount of the welding wire 4 in forward feed is set to be equal to or greater than the feed amount of the welding wire 4 in reverse feed. That is, area A1 (reverse feed amount) ≦ area A2 (forward feed amount) and area B1 (reverse feed amount) ≦ area B2 (forward feed amount) shown in FIG. 2. This reduces the possibility of damaging the tip or base material due to contact between the tip at the tip of the welding wire 4 and the base material, and improves the possibility of removing slag, etc. attached to the tip of the welding wire 4 and slag, etc. present between the welding wire 4 and the base material.

As a result, electrical contact (short circuit) occurs between the welding wire 4 and the base material, generating an arc and performing welding.

Furthermore, in forward and reverse feed during slow-down control, it may be preferable that the feed speed of the welding wire 4 in the forward direction during the forward and reverse feed is greater than the feed speed of the welding wire 4 in the forward feed during slow-down control. As described above, when an arc is not generated during forward feed during slow-down control, the welding wire 4 is controlled to be fed forward and reverse. At this time, by making the feed speed of the welding wire 4 in the forward direction during forward and reverse feed greater than the feed speed of forward feed, the possibility of properly removing slag, etc., adhering to the tip of the welding wire 4 and slag, etc., present between the welding wire 4 and the base material is improved. As a result, by removing the cause of the arc generation and causing electrical contact (short circuit) between the welding wire 4 and the base material, an arc is generated and welding is performed.

[Wire feeding method]
Next, a wire feeding method executed by the wire feeding system 1 according to one embodiment of the present invention will be specifically described in detail.

Figure 3 is a flowchart showing a wire feeding method M100 executed by the wire feeding system 1 according to one embodiment of the present invention. As shown in Figure 3, the wire feeding method M100 includes steps S101 to S104, and each step is executed by a processor included in the wire feeding system 1.

In step S101, the wire feeder 10 feeds the welding wire 4 in the forward direction, which is the direction of the base material (forward feed step). Specifically, the wire feed controller 20 controls the wire feeder 10 to forward feed the welding wire 4 during slowdown control.

In step S102, if the welding wire 4 is fed forward under slow-down control in step S101 and the detection unit 30 detects the start of an arc (detection step), the process proceeds to step S104 (Yes in step S102); if the start of an arc is not detected, the process proceeds to step S103 (No in step S102).

In step S103, the wire feeder 10 feeds the welding wire 4 in a forward and reverse direction repeatedly (forward and reverse feed step). Specifically, the wire feeder control unit 20 controls the wire feeder 10 to feed the welding wire 4 forward and reverse while continuing to apply a voltage to generate an arc during slowdown control.

In step S104, welding is performed, and the wire feeding system 1 feeds the welding wire 4 according to the welding. Specifically, the wire feeding control unit 20 controls the wire feeding unit 10 to transition from slow-down control to welding control and feed the welding wire 4 at a speed faster than the feeding speed in the slow-down control.

Here, in step S103, it is assumed that an arc is started by controlling the wire feeder 10 to feed the welding wire 4 in both directions, and the process proceeds to step S104. More specifically, if the welding wire 4 is fed in both directions and the start of an arc is detected, the process proceeds to step S104. For example, even if the wire feeder 10 is controlled to feed the welding wire 4 in both directions in step S103, if the arc does not start within a predetermined time, it is acceptable to notify the user of the abnormality as it is assumed that the arc has not started.

As described above, according to the wire feeding system 1 and wire feeding method M100 of one embodiment of the present invention, in the slow-down control for feeding the welding wire 4 in the forward direction to generate an arc, if the load on the motor reaches a threshold value without the arc starting, the wire feeding control unit 20 controls the wire feeding unit 10 to feed the welding wire 4 in the forward and reverse directions while continuing to apply voltage to generate an arc. This makes it possible to avoid placing an excessive load on the motor and to avoid damage caused by strong contact between the tip and the base material. As a result, it is possible to reduce the shortening of the lifespan of components such as the tip and the motor.

In this embodiment, if the motor load reaches a threshold value but the arc does not start, the detection unit 30 detects that the arc has not started, and the wire feed control unit 20 controls the wire feed unit 10 to feed the welding wire 4 forward and backward. However, the means by which the detection unit 30 detects that the arc has not started is not limited to this.

For example, based on the amount of welding wire 4 actually fed and the state of the wire buffer 12 corresponding to a feed command from the wire feed control unit 20, the detection unit 30 may detect that an arc has not started, and the wire feed control unit 20 may control the wire feed unit 10 to feed the welding wire 4 forward and backward.

More specifically, in the slow-down control in which the welding wire 4 is forward-fed to generate an arc, if the welding wire 4 continues to be forward-fed in response to a feed command from the wire feed control unit 20 without the arc starting, the tip of the welding wire 4 is already in direct or indirect contact with the base material, and therefore the amount of welding wire 4 fed corresponding to the feed command is not actually reached, and the amount of welding wire 4 stored in the wire buffer 12 increases, resulting in an excess state. In this way, the detection unit 30 may detect that an arc has not started based on the actual feed amount corresponding to the feed command and the excess state of the welding wire 4 in the wire buffer 12.

Furthermore, normally, when the welding wire 4 is fed forward under slow-down control, if there is no slag or the like between the welding wire 4 and the base material, electrical contact (short circuit) occurs between the welding wire 4 and the base material, and an arc is started. Therefore, if the detection unit 30 does not detect the start of an arc within a predetermined time after the slow-down control is started, it is determined that an arc has not started, and the wire feed control unit 20 may control the wire feed unit 10 to feed the welding wire 4 forward and backward.

Furthermore, the predetermined time may be calculated based on at least one of the history of when an arc started or the history of when an arc did not start. For example, there may be variation in the time from when the welding wire 4 is fed in the slow-down control until the arc starts due to various factors such as the type and performance of the welding machine, wire feeding system 1, detection unit 30, and welding wire 4, and other environmental factors. For this reason, the time from when the welding wire 4 is fed in the slow-down control until the arc starts may be stored as history in a memory or the like, and the predetermined time may be set based on that history.

The detection unit 30 may also use an optical sensor such as a CCD camera or a laser sensor to detect that the tip of the welding wire 4 appears to have reached the base material, and if an arc is not started even though an arc should be started, it may detect that an arc is not starting.

In this embodiment, the wire feed control unit 20 and the detection unit 30 are arranged in the same housing as the wire feed unit 10, and the wire feed system 1 shown in FIG. 1 can be regarded as a single wire feeder, but is not limited to this. For example, all or part of the wire feed control unit 20 and the detection unit 30 may be arranged in a housing (e.g., a control device, etc.) different from the wire feed unit 10, and may be controlled by sending feed commands, etc. to the wire feed unit 10 via wire or wirelessly.

Furthermore, the wire feed control unit 20 controls the wire feed unit 10 to feed the welding wire 4 forward and backward when the welding wire 4 is fed forward during slow-down control and an arc does not start. However, the user may be allowed to select whether to enable or disable the function that accompanies this control. The user may select enable or disable by operating a teaching pendant or the like, for example.

The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The elements of the embodiments, as well as their arrangements, materials, conditions, shapes, sizes, etc., are not limited to those exemplified, and may be modified as appropriate. Furthermore, configurations shown in different embodiments may be partially substituted or combined.

1...wire feeding system, 2...wire reel, 3...welding torch, 4...welding wire, 10...wire feeding section, 11...first wire feeding section, 12...wire buffer, 13...second wire feeding section, 20...wire feeding control section, 30...detection section, M100...wire feeding method, S101-S104...each step of wire feeding method M100

Claims (6)

a wire feeder that feeds a welding wire;
a wire feed control unit that controls the wire feed unit to perform forward feeding, which feeds the welding wire in a forward direction that is a direction of a base material, or forward/reverse feeding, which feeds the welding wire repeatedly in the forward direction and a reverse direction;
a detection unit that detects whether an arc is started during slow-down control of forward feeding of the welding wire to generate an arc,
the wire feed control unit controls the wire feed unit to perform the forward/reverse feed while continuing to apply a voltage for generating the arc when the detection unit detects that an arc has not started,
When the wire feeder is controlled by the wire feed control unit to perform the forward/reverse feed under slow-down control, a feed speed of the welding wire in the forward direction among the forward/reverse feeds is greater than a feed speed of the welding wire in the forward feed under slow-down control .
Wire feeding system. a wire feeder that feeds a welding wire;
a wire feed control unit that controls the wire feed unit to perform forward feeding, which feeds the welding wire in a forward direction that is a direction of a base material, or forward/reverse feeding, which feeds the welding wire repeatedly in the forward direction and a reverse direction;
a detection unit that detects whether an arc is started during slow-down control of forward feeding of the welding wire to generate an arc,
the wire feed control unit controls the wire feed unit to perform the forward/reverse feed while continuing to apply a voltage for generating the arc when the detection unit detects that an arc has not started,
In the forward and reverse feeding, the amount of welding wire fed in the forward direction is equal to or greater than the amount of welding wire fed in the reverse direction .
Wire feeding system. a wire feeder that feeds a welding wire;
a wire feed control unit that controls the wire feed unit to perform forward feeding, which feeds the welding wire in a forward direction that is a direction of a base material, or forward/reverse feeding, which feeds the welding wire repeatedly in the forward direction and a reverse direction;
a detection unit that detects whether an arc is started during slow-down control of forward feeding of the welding wire to generate an arc,
the wire feed control unit controls the wire feed unit to perform the forward/reverse feed while continuing to apply a voltage for generating the arc when the detection unit detects that an arc has not started,
the wire feed control unit controls the wire feed unit to perform the forward/reverse feed when an arc is not started within a predetermined time period after the slow-down control is started,
The predetermined time is calculated based on at least one of a history of when an arc has started and a history of when an arc has not started .
Wire feeding system. A wire feeding method performed by a wire feeding system that feeds a welding wire, comprising:
a forward feeding step of feeding the welding wire in a forward direction, which is a direction of a base metal, in a slow-down control of feeding the welding wire to generate an arc;
a detection step of detecting whether an arc starts during the positive feeding step;
and a forward/reverse feeding step of feeding the welding wire repeatedly in the forward direction and the reverse direction while continuing application of a voltage for generating the arc when it is detected in the detection step that an arc has not been started ,
a feed speed of the welding wire in the forward direction when the welding wire is repeatedly fed in the forward and reverse directions in the forward and reverse feed step is greater than a feed speed of the welding wire in the forward direction in a slow-down control of the forward feed step.
Wire feeding method. A wire feeding method performed by a wire feeding system that feeds a welding wire, comprising:
a forward feeding step of feeding the welding wire in a forward direction, which is a direction of a base metal, in a slow-down control of feeding the welding wire to generate an arc;
a detection step of detecting whether an arc starts during the positive feeding step;
and a forward/reverse feeding step of feeding the welding wire repeatedly in the forward direction and the reverse direction while continuing application of a voltage for generating the arc when it is detected in the detection step that an arc has not been started,
an amount of the welding wire fed in the forward direction when the welding wire is fed repeatedly in the forward and reverse directions in the forward and reverse feeding step is equal to or greater than an amount of the welding wire fed in the reverse direction;
Wire feeding method. A wire feeding method performed by a wire feeding system that feeds a welding wire, comprising:
a forward feeding step of feeding the welding wire in a forward direction, which is a direction of a base metal, in a slow-down control of feeding the welding wire to generate an arc;
a detection step of detecting whether an arc starts during the positive feeding step;
and a forward/reverse feeding step of feeding the welding wire repeatedly in the forward direction and the reverse direction while continuing application of a voltage for generating the arc when it is detected in the detection step that an arc has not been started,
in the forward and reverse feeding step, if an arc is not started within a predetermined time period after the slow-down control is started, feeding of the welding wire in the forward and reverse directions repeatedly is started while continuing application of a voltage for generating the arc;
The predetermined time is calculated based on at least one of a history of when an arc has started and a history of when an arc has not started.
Wire feeding method.

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