JP2015112607A - Consumable electrode type arc welder, and wire feeding control method in consumable electrode type arc welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a consumable electrode type arc welder (wire feeding control method) capable of switching easily whether variable adjustment of wire operation speed upon arc start is performed or not.SOLUTION: Such a constitution is applied that, concerning descending speed when a wire is allowed to descend so as to make contact once with a welding object upon arc start, it is determined by an operation mode of a torch switch that which mode is to be selected from between the mode (variable mode) in which the speed is changed to speed V0-Vx corresponding to the welding state at that time and the mode (fixed mode) in which the speed is fixed at speed V0 set beforehand regardless of the welding state at that time.

Description

  The present invention relates to a consumable electrode arc welder and a wire feed control method in a consumable electrode arc welder, and more particularly to a wire feed mode at the time of arc start.

  In consumable electrode arc welding, welding is performed while feeding a wire used as an electrode according to the wear during welding. For example, in Patent Document 1, the lowering speed for lowering the wire toward the base material at the time of arc start is a predetermined slow speed until the wire contacts the base material. However, a technique is disclosed in which the descending speed is adjusted according to the situation at times to shorten the downtime between welding operations.

JP 2004-276088 A

  By the way, when a series of welding operations are performed intermittently, the wire lowering speed is variable at the time of arc start at every welding resumption. There is also a possibility. That is, depending on the operator, during the series of welding operations, it may be determined that the wire lowering speed needs to be variable in some cases, and in some cases, it may be determined that changing the wire lowering speed is unnecessary. In some cases, there has been a desire to be able to make an appropriate selection in a series of welding operations and to be able to do this easily.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is consumable electrode arc welding that can easily switch whether or not the wire operating speed at the time of arc start is variable. And a wire feeding control method in a consumable electrode type arc welding machine.

  A consumable electrode arc welding machine that solves the above problems includes a power generation device that generates output power to be supplied to a wire used as a consumable electrode, a feeding device that performs feeding according to the consumption of the wire due to arcing, A consumable electrode type arc welding machine comprising a control circuit for controlling power generation in the power generation device and feeding operation in the feeding device for performing arc welding. At the start, the operation speed when the wire is brought close to the welding target once is changed to a variable mode in which the speed is changed according to the occasional welding situation, and the speed is previously set regardless of the occasional welding situation. The variable mode can be controlled by any one of a fixed mode for fixing at a set speed and an operation mode of a switch provided in a welding torch for supporting and feeding the wire. A fixed mode and selectable configured.

  According to this configuration, the operation speed when the wire is brought close to the welding target at the time of arc start is changed in accordance with the welding situation from time to time, or the welding speed is sometimes changed. Regardless of whether the speed is fixed at a preset speed or not, the operation mode of the welding torch switch is selected. As a result, it is possible to easily switch the wire operating speed between variable and fixed by a manual operation of the welding operator.

  In the above consumable electrode arc welder, it is preferable that the mode switching of the control circuit can be performed by a combination of operations of one switch of the welding torch.

  According to this configuration, since the wire operating speed can be switched between variable and fixed by a combination of operations of one switch of the welding torch, the operation is simpler, and the number of switches provided in the welding torch is limited. It is easy to apply to the device.

  In the above-mentioned consumable electrode type arc welder, it is preferable that the switch of the welding torch for switching the mode of the control circuit is also used as a switch for performing another operation command.

  According to this configuration, since the switch of the welding torch for switching the mode of the control circuit is also used as a switch for performing other operation commands, it can be handled without newly providing a switch for mode switching. .

  A wire feed control method for a consumable electrode arc welder that solves the above problems includes a power generation device that generates output power to be supplied to a wire used as a consumable electrode, and a feed according to the consumption of the wire due to arcing. Wire feeding in a consumable electrode type arc welding machine comprising: a feeding device for performing arc welding; and a control circuit for controlling power generation in the power generation device and feeding operation in the feeding device for performing arc welding. The feed control method is a variable mode in which the operation speed when the wire is brought close to contact with the object to be welded at the time of arc start is changed according to the welding situation from time to time, and sometimes welding is performed. Regardless of the situation, the welding torch is controlled in any one of a fixed mode for fixing the speed to a preset speed, and supports and feeds the wire. Wherein in the operating mode switch provided in which the selection of the variable mode and the fixed mode is performed.

  According to this configuration, similarly to the above, it is possible to easily switch whether the wire operating speed is variable or fixed at the time of arc start by the operation mode of the switch of the welding torch.

  According to the consumable electrode arc welder and the wire feed control method in the consumable electrode arc welder of the present invention, it is possible to easily switch whether or not the wire operating speed at the time of arc start is variable.

It is a schematic block diagram of the consumable electrode type arc welder in one Embodiment. (A) and (b) are operation | movement explanatory drawings at the time of an arc start.

Hereinafter, an embodiment of the consumable electrode type arc welding machine (feed control method) will be described.
A consumable electrode type arc welding machine 10 shown in FIG. The welding power source device 11 is composed of an insulating power conversion device using an inverter 11a and the like, and generates DC output power suitable for arc welding from a three-phase AC commercial power source or the like. In the power supply device 11, a control circuit 12 that performs integrated control of arc welding including switching control of the inverter 11 a is provided. One output terminal of the power supply device 11 is connected to a feeding device 14 via a connection cable 13 including a power line and a communication line, and the feeding device 14 is also welded via a connection cable 13 including a power line and a communication line. Connected to the torch 15. The other output terminal of the power supply device 11 is connected to an object to be welded (base material) 17 via a grounding cable 16.

  The feeding device 14 feeds the wire 18 to the welding torch 15 (the wire between the feeding device 14 and the welding torch 15 is not shown). That is, the wire 18 supported as an electrode on the welding torch 15 is consumed by an arc generated at the tip based on the supply of output power from the power supply device 11 during welding. The feeding operation is performed at a feeding speed according to the above. The feeding speed of the wire 18 is controlled by the control circuit 12 of the power supply device 11 so as to become an appropriate value each time.

  In the welding torch 15, an arc is generated from the tip of the wire 18 and the shielding gas G is injected around the arc. That is, the shield gas G stored in the gas storage device 19 can be supplied to the torch 15 between the gas storage device 19 and the feeding device 14 and between the feeding device 14 and the welding torch 15. Each is connected by a feeding hose 20 so that The gas storage device 19 includes a gas regulator 21 that adjusts the flow rate of the gas G. The flow rate of the gas G is controlled to be an appropriate value each time by the control of the control circuit 12 for the regulator 21.

  Further, the welding torch 15 is provided with a torch switch 22 for instructing start or stop (on / off) of arc welding. A command signal from the torch switch 22 is transmitted to the control circuit 12 via the connection cable 13. When the torch switch 22 is turned on by an operator who performs welding, the control circuit 12 performs welding control including arc start.

Next, operation | movement (action) of the arc welding machine 10 of this embodiment is demonstrated.
When the torch switch 22 is turned on to start the welding operation, the control circuit 12 of the power supply device 11 starts arc start control based on the input of the operation signal.

  Here, as an initial operation at the time of arc start, first, the wire 18 is lowered (slowed down) toward the welding object 17 at a predetermined slow speed, and the tip of the wire 18 is temporarily brought into contact with the welding object 17. . The lowering speed of the wire 18, that is, the feeding speed of the wire 18 by the feeding device 14 is controlled by the control circuit 12. The initial lowering speed of the wire 18 at the start of the arc is controlled in advance. The operator can select whether to use a fixed mode for fixing to a speed, or to use a variable mode in which the fixed descending speed is set to the minimum speed and the speed is changed to a high speed according to the welding situation.

  For example, in a situation where a series of welding operations are performed intermittently and the time interval from the end of the previous welding is short, generally the lowering speed of the next wire 18 may be made higher than the speed in the fixed mode. There is a desire to change the descending speed to a faster speed according to the time interval between welding operations, assuming that the initial arc is normally generated and the arc start can be performed in a relatively short time. There is also a demand for making the descent speed of the wire 18 variable in accordance with not only the time interval between the welding operations but also the welding conditions at each time such as the material of the welding object 17 and the groove shape. Considering these, a variable mode is set in which the descent speed of the wire 18 is changed within a range that does not affect the arc start according to various parameters such as the time interval between welding operations, the material of the welding object 17, the groove shape, and the like. Yes.

  On the other hand, even when the time interval between welding operations is short or considering the material of the welding object 17 and the groove shape, there is a case where the lowering speed of the wire 18 is not necessarily increased from the fixed mode speed (minimum speed). . Considering this, a fixed mode for fixing the lowering speed of the wire 18 to a preset speed is also set together with the variable mode.

  Then, as shown in FIGS. 2 (a) and 2 (b), the control circuit 12 lowers the speed of lowering of the wire 18 within a time T1, for example, about 0.2 seconds from the first operation of the torch switch 22 for instructing the welding start. The control mode is assigned to the time for selecting either the variable mode or the fixed mode. For example, when the operator performs two on operations (double click) of the torch switch 22, the control circuit 12 recognizes that the fixed mode has been selected based on the input of the operation signal, and the initial of the subsequent wire 18. It is fixed at the descending speed V0 in the descending operation.

  On the other hand, if the operator does not perform, for example, a double click operation of the torch switch 22 within the time T1, the control circuit 12 recognizes that the variable mode has been selected based on the input of the operation signal, and the subsequent wire 18 In the initial descending operation, the descending velocity Vx is calculated and changed according to useful parameters that can reliably perform the arc start in a short period of time.

At the next time T2, the control circuit 12 opens the regulator 21 to start the injection of the shield gas G before the lowering operation of the wire 18.
At the next time T3, the control circuit 12 causes the feeding device 14 so that the wire 18 descends at the descending speeds V0 to Vx set at the previous time T1 (in this case, the set speed is constant within the time T3). Is started and output voltage is generated.

  At a time T4 after the wire 18 once contacts the welding object 17, the control circuit 12 generates an output voltage and an output current suitable for arc welding, and sets the descending speed of the wire 18 to the descending speed V0. The arc welding of the welding object 17 is performed at a constant speed after gradually increasing from ~ Vx with a predetermined gradient.

Next, characteristic effects of the present embodiment will be described.
(1) Regarding the descending speed when the wire 18 is once brought into contact with the welding object 17 at the time of arc start, a mode (variable mode) in which the speed is changed to the speed V0 to Vx according to the welding situation from time to time. In this configuration, the mode of fixing to the preset speed V0 (fixed mode) is selected by the operation mode of the torch switch 22 regardless of the welding situation. As a result, switching between making the descent speed of the wire 18 variable or fixed can be easily performed by hand operation of the welding operator.

  (2) Since the switching of the descent speed of the wire 18 is variable or fixed can be performed by a combination of operations of one switch 22 provided in the welding torch 15, the operation is simpler, and the switch provided in the welding torch 15 It can be easily applied to an apparatus in which the number of devices is limited.

  (3) Since the switch 22 of the welding torch 15 for switching the mode of the control circuit 12 is also used as a switch for performing other operation commands such as a welding start command, it is not necessary to provide a new switch for mode switching. It is possible.

In addition, you may change the said embodiment as follows.
-Although the mode switching of the control circuit 12 was performed by two ON operations (double click) within the time T1 by the torch switch 22, this is only an example, and other operation modes (combinations of operations) may be employed. .

  Although the torch switch 22 for instructing the welding start of the welding torch 15 is also used for mode switching of the control circuit 12, other switches provided in the welding torch 15 may be used. Two or more switches may be used. Further, a switch for switching the mode of the control circuit 12 may be newly provided.

  The welding control (control waveform) including the arc start shown in FIG. 2 is an example, and the configuration of the arc welding machine 10 shown in FIG. 1 is an example. You may change these suitably.

11 Welding power supply (power generation equipment)
11a Inverter (power generation device)
12 Control Circuit 14 Feeding Device 15 Welding Torch 17 Welding Object 18 Wire 22 Torch Switch (Switch)
V0, Vx descending speed (operation speed)

Claims (4)

A power generation device that generates output power to be supplied to a wire used as a consumable electrode, a feeding device that performs feeding according to the consumption of the wire due to arcing, and the power generation device for performing arc welding. A consumable electrode type arc welding machine comprising a control circuit for controlling power generation and feeding operation in the feeding device,
The control circuit has a variable mode for changing the speed according to the welding situation from time to time, and an operation speed when the wire is brought close to the welding target at the time of arc start. Regardless, the speed can be controlled in either a fixed mode that fixes the speed to a preset speed, and the variable mode and the fixed mode can be controlled in the operation mode of the switch provided in the welding torch that supports and feeds the wire. Is a consumable electrode type arc welding machine characterized in that it can be selected. In the consumable electrode type arc welder according to claim 1,
The consumable electrode arc welding machine is configured so that the mode switching of the control circuit can be performed by a combination of operations of one switch of the welding torch. In the consumable electrode type arc welding machine according to claim 1 or 2,
The consumable electrode arc welding machine, wherein the switch of the welding torch for switching the mode of the control circuit is also used as a switch for performing another operation command. A power generation device that generates output power to be supplied to a wire used as a consumable electrode, a feeding device that performs feeding according to the consumption of the wire due to arcing, and the power generation device for performing arc welding. A wire feed control method in a consumable electrode arc welding machine comprising a control circuit for controlling power generation and feed operation in the feed device,
At the time of arc start, the operation speed when the wire is brought close to the welding target once is variable mode in which the speed is changed according to the occasional welding situation, and the speed regardless of the occasional welding situation. The variable mode and the fixed mode are selected in the operation mode of the switch provided in the welding torch for supporting the wire and supplying power. A wire feed control method in a consumable electrode type arc welder characterized by being made.