WO2013051178A1 - Welding device - Google Patents

Welding device Download PDF

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Publication number
WO2013051178A1
WO2013051178A1 PCT/JP2012/004854 JP2012004854W WO2013051178A1 WO 2013051178 A1 WO2013051178 A1 WO 2013051178A1 JP 2012004854 W JP2012004854 W JP 2012004854W WO 2013051178 A1 WO2013051178 A1 WO 2013051178A1
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WO
WIPO (PCT)
Prior art keywords
welding
flow rate
valve
gas
gas flow
Prior art date
Application number
PCT/JP2012/004854
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French (fr)
Japanese (ja)
Inventor
香介 竹村
英樹 井原
田中　義朗
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to CN201280003815.4A priority Critical patent/CN103228390B/en
Priority to JP2013506391A priority patent/JP5263462B1/en
Publication of WO2013051178A1 publication Critical patent/WO2013051178A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories
    • B23K9/325—Devices for supplying or evacuating shielding gas

Definitions

  • the present invention relates to a welding apparatus that performs welding using a shielding gas.
  • Patent Document 1 As a welding apparatus equipped with a conventional welder, one having a valve for controlling the supply of shield gas in the welder is known (for example, see Patent Document 1).
  • the gas regulator attached to the gas cylinder is opened to the maximum extent, or the gas flow rate required during welding varies, but the gas regulator is opened according to the required maximum gas flow rate, and the shielding gas is removed. Some of them were welded while being supplied.
  • FIG. 8 is a front view showing a schematic configuration of a conventional welding apparatus and its peripheral devices.
  • the welding machine 101 is connected to a welding torch 114 and a gas cylinder 105.
  • the welding machine 1 is provided with a gas valve 102 that is a valve for controlling the supply of shield gas.
  • the gas cylinder 105 is provided with a gas regulator 106 as a flow rate regulator for adjusting the flow rate of the shield gas.
  • the flow rate of the shield gas is set by the gas regulator 106.
  • a torch switch (not shown) provided on the welding torch 114 is pressed, a welding start signal is sent to the welding machine 101.
  • the welding machine 101 that has received the welding start signal opens the gas valve 102, the shielding gas is supplied to the welding torch 114.
  • gas valve 102 performs an operation of closing or opening, and does not have a function of opening only half, for example.
  • the gas regulator 106 is set in accordance with the period during which the gas flow rate is the highest during the welding period. For this reason, a large amount of gas flows unnecessarily even during a welding period in which a very small amount of gas is used, resulting in wasted shielding gas.
  • the present invention provides a welding apparatus that can prevent gas from protruding at the start of welding and suppress waste of shielding gas.
  • the welding apparatus of the present invention is a welding apparatus having a welding machine in the middle of a shield gas supply path from a gas supply source to a welding torch.
  • at least two valves including a first valve and a second valve are provided in series in the shield gas supply path, and the first valve is disposed on the side close to the welding torch, The second valve is disposed on the side close to the gas supply source.
  • the first valve is opened, and after the first predetermined time has elapsed since the first valve is opened, The second valve is configured to be opened.
  • This configuration can prevent gas from protruding at the start of welding and suppress waste of shielding gas.
  • FIG. 1 is a front view showing a schematic configuration of a welding apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is a front view showing a schematic configuration of the gas flow rate adjusting apparatus according to Embodiment 1 of the present invention.
  • FIG. 3 is a plan view showing a schematic configuration of a main part of the welding apparatus according to Embodiment 1 of the present invention.
  • FIG. 4 is a perspective view showing an appearance of the welding machine according to Embodiment 2 of the present invention.
  • FIG. 5 is a front view showing a schematic configuration of an operation unit of the welding machine according to Embodiment 2 of the present invention.
  • FIG. 6 is a characteristic diagram showing the relationship between the welding current and the gas flow rate in the second embodiment of the present invention.
  • FIG. 7 is a characteristic diagram showing the relationship between the welding current and the gas flow rate in the second embodiment of the present invention.
  • FIG. 8 is a front view showing a schematic configuration of a conventional welding apparatus.
  • FIG. 1 is a front view showing a schematic configuration of a welding apparatus and its peripheral devices in the first embodiment.
  • FIG. 2 is a front view showing a schematic configuration of the gas flow rate adjusting device according to the first embodiment.
  • FIG. 3 is a plan view showing a schematic configuration of a main part of the welding apparatus according to the first embodiment.
  • the welding machine 1 is connected to a welding torch 14 and a gas flow rate adjusting device 3.
  • the gas flow rate adjusting device 3 is connected to a gas cylinder 5 as a gas supply source via a gas regulator 6.
  • the welding device includes at least the welding machine 1 and the gas flow rate adjusting device 3.
  • the pipe 5 a is a pipe that connects the gas cylinder 5 to the welding torch 14, and supplies a shielding gas from the gas cylinder 5 to the welding torch 14.
  • the welding machine 1 is provided with a gas valve 2 as a first valve 2 for controlling the supply of shield gas.
  • the gas flow rate adjusting device 3 is provided with a gas valve 4 as a second valve 4 for controlling the supply of shield gas.
  • the gas cylinder 5 is provided with a gas regulator 6 as a flow rate regulator for adjusting the flow rate of the shield gas.
  • the gas flow rate adjusting device 3 includes a gas valve 4 as a second valve 4 that controls the supply of shield gas, a control unit 7 that controls the gas flow rate adjusting device 3, and a flow rate of the shield gas. And a flow rate sensor 8 for measuring.
  • the welding machine 1 includes a welding control unit 9 that controls the welding machine 1. Information is exchanged between the welding control unit 9 of the welding machine 1 and the control unit 7 of the gas flow rate adjusting device 3 as indicated by an arrow 19.
  • the welding machine 1 is configured to include a storage unit 16, a welding current setting unit 18, and a flow rate determining unit 17, as shown in FIG.
  • the storage unit 16 stores a characteristic curve in which a quantitative relationship between the set welding current and the shield gas flow rate is associated.
  • the welding current setting unit 18 sets a set welding current.
  • the flow rate determination unit 17 determines the shield gas flow rate based on the set welding current set by the welding current setting unit 18 and the characteristic curve stored in the storage unit 16.
  • the shield gas is synchronized with the set welding current, and the shield gas can be controlled automatically.
  • the required shield gas flow rate differs between the high welding current region and the low welding current region. Therefore, when the welding current is low, the amount of shielding gas used is reduced, and the cost can be reduced by reducing wasteful shielding gas.
  • the flow rate of the shielding gas is set by the gas regulator 6 provided in the gas cylinder 5.
  • the shield gas flows from the gas cylinder 5 to the gas valve 4 of the gas flow rate adjusting device 3 through the pipe 5a.
  • the gas flow rate output value is set based on the welding current command value set in advance in the welding current setting unit 18 of the welding machine 1. It is determined. Specifically, the welding control unit 9 of the welding machine 1 stores the characteristics in which the welding current command value and the gas flow rate output value are associated with each other in the form of a table or a mathematical expression. And the welding control part 9 determines a gas flow rate output value based on the set welding current command value. That is, the welding control unit 9 determines the shield gas flow rate based on the function of the storage unit 16 that stores the characteristics in which the set welding current and the shield gas flow rate are associated with each other and the set welding current and the stored characteristics. The function of the determination unit 17 is provided. Then, the determined gas flow rate output value is sent to the control unit 7 of the gas flow rate adjusting device 3, and is sent from the control unit 7 to the gas valve 4.
  • the signal is transmitted to the welding control unit 9 of the welding machine 1, and the welding control unit 9 controls the gas valve 2 to “open” the gas valve 2.
  • the gas valve 2 performs only on-off and does not have a flow rate adjusting function.
  • the welding control unit 9 has a time measuring function, measures the elapsed time after the gas valve 2 is “opened”, and elapses after a predetermined first predetermined time has elapsed since the “open” operation is performed. Then, a signal indicating that the first predetermined time has elapsed is transmitted as information to the control unit 7 of the gas flow rate adjusting device 3.
  • the first predetermined time is, for example, about 10 msec to 100 msec.
  • the control unit 7 that has received a signal indicating that the first predetermined time has elapsed from the welding control unit 9 controls the gas valve 4 to “open” the gas valve 4.
  • the gas valve 4 has an on-off function and a flow rate adjustment function.
  • the shield gas is supplied from the gas cylinder 5 to the welding torch 14.
  • the gas valve 2 (first valve 2) of the welding machine 1, which is a gas valve close to the welding torch 14, is used. ) “Open”.
  • the gas valve 4 (second valve 4) of the gas flow rate adjusting device 3 which is the gas valve on the side close to the gas cylinder 5 is operated to “open”.
  • the gas valve 4 is “opened” to prevent the gas valve 4 from being “opened” earlier than the gas valve 2. That is, for example, the supply pressure of the shield gas is reduced as compared with the case where the gas valve 2 and the gas valve 4 are simultaneously opened. This is because if the gas valve 4 is set to “open” after the gas valve 2 is set to “open”, the residual amount of shielding gas in the pipe 5a is reduced as described above when the gas valve 4 is set to “open”. is there. Accordingly, it is possible to prevent the shielding gas from protruding from the pipe 5a.
  • the first shield gas supply distance L1 from the gas valve 2 of the welding machine 1 to the welding torch 14 and the second shield gas supply distance from the gas valve 4 of the gas flow rate adjusting device 3 to the welding torch 14 are also described.
  • the second shield gas supply distance L2 is longer than L2.
  • the shield gas supply distance in the conventional welding apparatus corresponds to the first shield gas supply distance L1
  • the shield gas supply distance in the welding apparatus of the first embodiment corresponds to the second shield gas supply distance L2.
  • the welder 1 may be used by being directly connected to the gas cylinder 5, and the gas valve 2 is provided inside in consideration of versatility.
  • the welder 1 including the gas valve 2 is widely used.
  • the welding apparatus of this Embodiment 1 is related with the welding apparatus provided with the welding machine 1 provided with such a gas valve 2.
  • the welding apparatus according to the first embodiment is a welding apparatus having a welding machine in the middle of the shield gas supply path from the gas supply source 5 to the welding torch 14.
  • at least two valves including the first valve 2 and the second valve 4 are provided in series in the shield gas supply path, and the first valve 2 is closer to the welding torch 14.
  • the second valve 4 is arranged on the side close to the gas supply source 5.
  • This configuration can prevent gas from protruding at the start of welding and suppress waste of shielding gas.
  • a torch switch (not shown) of the welding torch 14 When a torch switch (not shown) of the welding torch 14 is turned off at the end of welding, a signal indicating that the welding torch 14 is turned off is input to the welding control unit 9 of the welding machine 1. Then, the welding control unit 9 sends this signal to the control unit 7 of the gas flow rate adjusting device 3. The control unit 7 that has received the signal from the welding control unit 9 controls the gas valve 4 of the gas flow rate adjusting device 3 to perform a “closed” operation.
  • the control unit 7 has a time measuring function, measures the elapsed time after the gas valve 4 is “closed”, and when a predetermined second predetermined time elapses after the “close” operation. Then, the fact that the second predetermined time has passed is transmitted to the welding control unit 9 of the welding machine 1.
  • the second predetermined time is, for example, about 10 msec to 100 msec.
  • the welding control unit 9 that has received a signal indicating that the second predetermined time has elapsed from the control unit 7 controls the gas valve 2 and causes the gas valve 2 to be “closed”.
  • the gas valve 4 (second valve) of the gas flow rate adjusting apparatus 3 that is a gas valve close to the gas cylinder 5 is used.
  • the valve 4 is closed.
  • the welding apparatus according to the first embodiment causes the gas valve 2 (first valve 2) of the welding machine 1, which is a gas valve close to the welding torch 14, to be "closed".
  • the shield gas having a pressure sufficiently higher than the atmospheric pressure is released from the welding torch 14 to the atmosphere without being confined in the pipe 5a from the gas valve 4 to the gas valve 2, and the pressure of the shield gas in the pipe 5a is Reduced to the same level as atmospheric pressure. Therefore, the shield gas remaining in the pipe 5a of the shield gas supply path from the gas valve 4 of the gas flow rate adjusting device 3 to the welding torch 14, that is, the residual amount of shield gas when converted to atmospheric pressure can be reduced. And by reducing the shield gas which remains in this way, it can contribute to suppression of the protrusion of the shield gas at the time of the next welding start. That is, the waste of shielding gas at the start of welding can be suppressed.
  • the gas flow rate adjusting device 3 is provided between the welding machine 1 and the gas cylinder 5. And in the welding apparatus of this Embodiment 1, when supplying shielding gas to the welding torch 14, the gas valve 2 (1st valve 2) provided in the welding machine 1 is made “open", and after 1st predetermined time.
  • the example which made the gas valve 4 (2nd valve 4) provided in the gas flow control apparatus 3 "open" was shown.
  • the gas flow rate adjusting device 3 may be provided between the welding machine 1 and the welding torch 14.
  • the gas valve 4 provided in the gas flow rate adjusting device 3 is provided as the first valve in the welding machine 1 after a first predetermined time after being “opened”.
  • the gas valve 2 thus made is set to “open” as the second valve.
  • At least two valves including a first valve and a second valve are provided in series in the shield gas supply path from the gas cylinder 5 to the welding torch 14.
  • the first valve on the side close to the welding torch 14 is set to “open”, and after the first predetermined time has elapsed since this “opening”, the gas cylinder 5 is supplied.
  • the second valve on the near side may be “open”.
  • the second valve on the side close to the gas cylinder 5 is set to “closed”, and after this “closed”, a second predetermined time has elapsed.
  • the second valve close to the welding torch 14 may be “closed”.
  • the welding apparatus may further include a valve such as a gas valve other than the first valve and the second valve described above.
  • FIG. 4 is a perspective view showing the appearance of the welder.
  • FIG. 5 is a front view illustrating a schematic configuration of an operation unit of the welding machine.
  • FIG. 6 is a characteristic diagram showing the relationship between the welding current and the gas flow rate.
  • FIG. 7 is a characteristic diagram showing the relationship between the welding current and the gas flow rate changed from the characteristics shown in FIG.
  • the main difference between the welding apparatus of the second embodiment and the first embodiment is that the gas flow rate determined based on the set welding current command value can be changed, and the gas flow rate has been changed.
  • the characteristic in which the welding current command value and the gas flow rate output value are associated with each other is changed.
  • the welding machine 1 further includes an operation unit 15.
  • the welding machine 1 includes a welding control unit 9 in the same manner as in the first embodiment, and includes a storage unit 16, a flow rate determination unit 17, and a welding current setting unit 18.
  • the operation unit 15 includes a current setting button 10 as a part of the welding current setting unit 18, a gas flow rate setting button 11 as a part of the shield gas flow rate changing unit 20, and a display unit. 12 and a jog dial 13 are provided.
  • the display unit 12 displays a welding current value, a gas flow rate value, and the like.
  • the jog dial 13 changes the value of the welding current and the value of the gas flow rate.
  • the welding current setting unit 18 and the flow rate changing unit 20 may be provided with a numeric keypad on the surface of the operation unit 15 for inputting a welding current value, a gas flow rate value, and the like.
  • the welding machine 1 shown in FIG. 4 is configured to include the flow rate changing unit 20 that changes the shield gas flow rate determined by the flow rate determining unit 17.
  • the shield gas flow volume with respect to setting welding current can be set freely. Therefore, the amount of shield gas used is reduced depending on the welding conditions, and further cost reduction is possible.
  • the welding current is set. Then, the jog dial 13 is turned to adjust the welding current displayed on the display unit 12 to a value to be set.
  • the welding current is set to the displayed value.
  • the welding control unit 9 stores characteristics indicating the relationship between the current value of the welding current shown in FIG. 6 and the gas flow rate of the shielding gas in the storage unit 16 in advance as a table or a mathematical expression.
  • FIG. 6 shows an example in which the characteristic is represented by a linear curve (straight line).
  • the welding control unit 9 determines the gas flow rate based on this characteristic and the set current value of the welding current. The determined gas flow rate is displayed on the display unit 12.
  • the gas flow rate is determined to be 4 L / min from FIG. A case where it is desired to change the gas flow rate to 1 L / min will be described.
  • the gas flow rate is determined to be 4 L / min, and the set welding current value of 40 A and the gas flow rate value of 4 L / min are displayed on the display unit 12.
  • the gas flow rate setting button 11 is pressed, the gas flow rate can be changed.
  • the jog dial 13 is turned to adjust the gas flow rate displayed on the display unit 12 to a value to be set, here 1 L / min.
  • a new gas flow rate is set as shown below.
  • the welding machine 1 when the gas flow rate is changed as described above, the welding machine 1 according to the second embodiment creates a characteristic indicating a new relationship between the welding current and the gas flow rate based on the change, and the welding controller 9 It has a function of storing in the storage unit 16 and performing welding based on this new characteristic. Details will be described below.
  • the welding control unit 9 creates new characteristics shown in FIG. 7 based on the changed value of the gas flow rate and the characteristics shown in FIG. Is stored in the storage unit 16 of the welding control unit 9.
  • the position indicated by the welding current 40A and the changed gas flow rate 1 L / min is set as the second inflection point.
  • a position where the welding current 20A smaller than the welding current 40A by 20A and the gas flow rate is 2 L / min is defined as a first inflection point.
  • the position where the welding current larger than the welding current 40A by a predetermined value 20A is 60A and the gas flow rate is 6 L / min is defined as a third inflection point.
  • a polygonal characteristic curve is created and stored in the storage unit 16 of the welding control unit 9 as the characteristic curve shown in FIG.
  • the predetermined value 20A is an example and is not limited to this, and an appropriate value may be obtained and set in advance through experiments or the like. Further, the predetermined value may be different between the side where the welding current is reduced and the side where the welding current is increased.
  • the gas flow rate is determined based on the new characteristic curve shown in FIG. 7 until a new set current is set or the gas flow rate is newly changed.
  • the characteristic curve stored in the storage unit 16 is a linear curve
  • the flow rate change unit 20 changes the shield gas flow rate
  • the set welding current and the changed shield gas flow rate The position indicated by the relationship is the second inflection point.
  • the intersection between the welding current value smaller than the set welding current by the first predetermined value and the primary curve is taken as the first inflection point, and the intersection between the welding current value larger than the set welding current by the second predetermined value and the primary curve. Is the third inflection point.
  • a new characteristic curve is created by linear interpolation between the first inflection point and the second inflection point and linear interpolation between the second inflection point and the third inflection point.
  • the welding apparatus of this Embodiment 2 is set as the structure which determines a shield gas flow volume based on a new characteristic curve until it changes a setting welding current.
  • This configuration has a function of changing the gas flow rate determined based on the basic characteristics stored in advance, so that the gas flow rate can be set according to the welding target. Thereby, it becomes possible to reduce the waste of shielding gas. Further, a new characteristic curve can be created based on the changed gas flow rate, and welding can be performed by determining the gas flow rate according to the set welding current based on the new characteristic curve. Thereby, stable welding can be performed as compared with the case where a new characteristic curve is not created and used.
  • a steady welding current for example, 40A
  • an initial welding current for example, 10A
  • An end welding current for example, 50 A
  • the characteristic curve shown in FIG. 7 is created based on the characteristic curve shown in FIG.
  • the gas flow rate in the initial period is determined to be 1 L / min based on the characteristic curve of FIG.
  • the value of the gas flow rate is the same as that in the case of the characteristic curve of FIG.
  • the steady welding current is set to 40 A
  • the gas flow rate during the steady welding period is determined to be 1 L / min based on the characteristic curve of FIG.
  • the gas flow rate is lower than that in the case of the characteristic curve of FIG.
  • the final welding current is set to 50 A
  • the gas flow rate in the final period is determined to be 3.5 L / min based on the characteristic curve of FIG. In this case, the gas flow rate is lower than that in the case of the characteristic curve of FIG.
  • the characteristic curve is created by linear interpolation between the inflection points as described above, so that the vicinity of the welding current (here, 40 A) in which the gas flow rate is changed (here, the gas flow rate is reduced) is changed.
  • the gas flow rate determined corresponding to the welding current (welding current in the range of 20A to 60A) is also a reduced value.
  • the change of the gas flow rate with respect to the change of the welding current (20A to 60A) becomes smaller than that in the case of the characteristic curve of FIG. 6, and stable welding can be performed as compared with the case of using the characteristic curve of FIG. it can.
  • the welding current setting unit 18 causes the steady welding current in the steady welding period, the initial welding current in the initial period that is the period before the steady welding period, and the steady welding period.
  • the final welding current in the final period which is a later period, is set.
  • the welding apparatus of the second embodiment creates a new characteristic curve. Then, the shield gas flow rate corresponding to the initial welding current and the shield gas flow rate corresponding to the final welding current may be determined based on a new characteristic curve.
  • a new characteristic curve can be created based on the changed gas flow rate, and welding can be performed by determining the gas flow rate according to the set welding current based on the new characteristic curve. Thereby, stable welding can be performed as compared with the case where a new characteristic curve is not created and used.
  • the gas flow rate corresponding to the welding target can be set, so that the waste of shielding gas can be reduced.
  • the gas flow rate is changed, a new characteristic curve is created, and the gas flow rate is determined based on the new characteristic curve according to the set welding current. Thereby, the change of the gas flow rate with respect to the change of the welding current is reduced, and stable welding can be performed.
  • the gas flow rate adjusting device 3 may be attached to the surface of the welding machine 1. Alternatively, the gas flow rate adjusting device 3 may be provided at a position away from the welding machine 1. Alternatively, the gas flow rate adjusting device 3 may be provided inside the welding machine 1.
  • the first valve 2 is provided in the welding machine 1, and the second valve 4 is provided between the gas supply source 5 and the welding machine 1. It is good also as a structure provided in the gas flow volume adjustment apparatus 3 for controlling supply of shield gas.
  • Such a configuration is an optimal combination in view of suppression of gas protrusion, interference with a torch, etc., reduction of installation work, and cost reduction.
  • the present invention it is possible to prevent gas from protruding at the start of welding, suppress waste of shielding gas, and industrially useful as a welding apparatus including a welding machine having a valve for controlling shielding gas. It is.

Abstract

A welding device for which a welding machine is provided along the length of a shield gas supply route, running from a gas supply source equipped with a flow adjustment device to a welding torch. With this welding device at least two valves are arranged in series in the shield gas supply route, with the first valve located nearer to the welding torch and the second valve located nearer to the gas supply source. When the welding device supplies shield gas to the welding torch the first valve is opened, and after a first prescribed time has elapsed from the opening of the first valve, the second valve is opened.

Description

溶接装置Welding equipment
　本発明は、シールドガスを用いて溶接を行う溶接装置に関する。 The present invention relates to a welding apparatus that performs welding using a shielding gas.
　近年、環境やエネルギーが社会問題となり企業全体の環境や省エネに対する意識が非常に高くなっている。このような状況下で、溶接機の省エネ効果が重要視されている。 In recent years, the environment and energy have become social problems, and the awareness of the entire company regarding the environment and energy saving has become very high. Under such circumstances, the energy saving effect of the welding machine is regarded as important.
　従来の溶接機を備えた溶接装置として、溶接機内にシールドガスの送給を制御するための弁を備えたものが知られている（例えば、特許文献１参照）。 As a welding apparatus equipped with a conventional welder, one having a valve for controlling the supply of shield gas in the welder is known (for example, see Patent Document 1).
　また、従来の溶接装置では、ガスボンベに取り付けられたガスレギュレータを最大限に開く、あるいは、溶接中において必要なガス流量は変化するが必要な最大ガス流量に合わせてガスレギュレータを開き、シールドガスを供給しながら溶接を行うものがあった。 Also, with conventional welding equipment, the gas regulator attached to the gas cylinder is opened to the maximum extent, or the gas flow rate required during welding varies, but the gas regulator is opened according to the required maximum gas flow rate, and the shielding gas is removed. Some of them were welded while being supplied.
　図８を用いて、従来の溶接装置について説明する。図８は従来の溶接装置とその周辺機器等の概略構成を示す正面図である。 A conventional welding apparatus will be described with reference to FIG. FIG. 8 is a front view showing a schematic configuration of a conventional welding apparatus and its peripheral devices.
　図８に示すように、溶接機１０１は、溶接トーチ１１４とガスボンベ１０５とに接続されている。溶接機１には、シールドガスの供給を制御する弁であるガスバルブ１０２が設けられている。ガスボンベ１０５には、シールドガスの流量を調整するための流量調整器としてガスレギュレータ１０６が設けられている。 As shown in FIG. 8, the welding machine 101 is connected to a welding torch 114 and a gas cylinder 105. The welding machine 1 is provided with a gas valve 102 that is a valve for controlling the supply of shield gas. The gas cylinder 105 is provided with a gas regulator 106 as a flow rate regulator for adjusting the flow rate of the shield gas.
　次に、図８に示す溶接装置の動作について説明する。 Next, the operation of the welding apparatus shown in FIG. 8 will be described.
　溶接前の準備として、ガスレギュレータ１０６によりシールドガスの流量を設定する。そして、溶接トーチ１１４に設けられている図示しないトーチスイッチを押すと、溶接開始信号が溶接機１０１に送られる。溶接開始信号を受信した溶接機１０１がガスバルブ１０２を開くことにより、溶接トーチ１１４にシールドガスが供給される。 As a preparation before welding, the flow rate of the shield gas is set by the gas regulator 106. When a torch switch (not shown) provided on the welding torch 114 is pressed, a welding start signal is sent to the welding machine 101. When the welding machine 101 that has received the welding start signal opens the gas valve 102, the shielding gas is supplied to the welding torch 114.
　なお、ガスバルブ１０２は、閉じるか開くかの動作を行うものであり、例えば半分だけ開くといったような機能は有していない。 Note that the gas valve 102 performs an operation of closing or opening, and does not have a function of opening only half, for example.
　従来の溶接装置では、溶接を開始してシールドガスを流す際、ガスバルブ１０２を「開」とした場合に、ガスホース内に溜まったシールドガスが一気に放出されてシールドガスの突出が起こる。これにより、無駄なシールドガスが放出されてしまうといった課題があった。 In the conventional welding apparatus, when starting the welding and flowing the shield gas, when the gas valve 102 is set to “open”, the shield gas accumulated in the gas hose is released at once and the shield gas protrudes. As a result, there is a problem in that useless shielding gas is released.
　また、従来の溶接装置では、溶接期間中においてガス流量が一番多い期間に合わせてガスレギュレータ１０６を設定している。そのため、ガスが微量ですむ溶接期間においても無駄に多くのガスを流しており、シールドガスの無駄が生じている。 In the conventional welding apparatus, the gas regulator 106 is set in accordance with the period during which the gas flow rate is the highest during the welding period. For this reason, a large amount of gas flows unnecessarily even during a welding period in which a very small amount of gas is used, resulting in wasted shielding gas.
　なお、溶接終了ごとにガス流量の変更は可能であるが、集中配管や、ガスレギュレータ１０６のある場所までの距離が長い事など、作業者がわざわざ変更することが作業中断となり、効率が悪くなる。 It is possible to change the gas flow rate at the end of welding, but the operator's intentional change, such as a long distance to the centralized piping or the location where the gas regulator 106 is located, interrupts the operation, resulting in poor efficiency. .
特開平１１－０７７３０９号公報Japanese Patent Laid-Open No. 11-077309
　本発明は、溶接開始時のガスの突出を防止して、シールドガスの無駄を抑制することができる溶接装置を提供する。 The present invention provides a welding apparatus that can prevent gas from protruding at the start of welding and suppress waste of shielding gas.
　上記課題を解決するために、本発明の溶接装置は、ガス供給源から溶接トーチに至るまでのシールドガスの供給経路の途中に溶接機を有する溶接装置である。本発明の溶接装置は、上記シールドガスの供給経路に第１の弁および第２の弁を含む少なくとも２つの弁を直列に設け、上記第１の弁を上記溶接トーチに近い側に配置し、上記第２の弁を上記ガス供給源に近い側に配置している。そして、本発明の溶接装置は、上記溶接トーチに上記シールドガスを供給する際に、上記第１の弁を開とし、上記第１の弁を開としてから第１の所定時間が経過した後に、上記第２の弁を開とする構成からなる。 In order to solve the above problems, the welding apparatus of the present invention is a welding apparatus having a welding machine in the middle of a shield gas supply path from a gas supply source to a welding torch. In the welding apparatus of the present invention, at least two valves including a first valve and a second valve are provided in series in the shield gas supply path, and the first valve is disposed on the side close to the welding torch, The second valve is disposed on the side close to the gas supply source. And when the welding apparatus of the present invention supplies the shielding gas to the welding torch, the first valve is opened, and after the first predetermined time has elapsed since the first valve is opened, The second valve is configured to be opened.
　この構成により、溶接開始時のガスの突出を防止して、シールドガスの無駄を抑制することができる。 This configuration can prevent gas from protruding at the start of welding and suppress waste of shielding gas.
図１は、本発明の実施の形態１における溶接装置の概略構成を示す正面図である。FIG. 1 is a front view showing a schematic configuration of a welding apparatus according to Embodiment 1 of the present invention. 図２は、本発明の実施の形態１におけるガス流量調整装置の概略構成を示す正面図である。FIG. 2 is a front view showing a schematic configuration of the gas flow rate adjusting apparatus according to Embodiment 1 of the present invention. 図３は、本発明の実施の形態１における溶接装置の要部の概略構成を示す平面図である。FIG. 3 is a plan view showing a schematic configuration of a main part of the welding apparatus according to Embodiment 1 of the present invention. 図４は、本発明の実施の形態２における溶接機の外観を示す斜視図である。FIG. 4 is a perspective view showing an appearance of the welding machine according to Embodiment 2 of the present invention. 図５は、本発明の実施の形態２における溶接機の操作部の概略構成を示す正面図である。FIG. 5 is a front view showing a schematic configuration of an operation unit of the welding machine according to Embodiment 2 of the present invention. 図６は、本発明の実施の形態２における溶接電流とガス流量との関係を示す特性図である。FIG. 6 is a characteristic diagram showing the relationship between the welding current and the gas flow rate in the second embodiment of the present invention. 図７は、本発明の実施の形態２における溶接電流とガス流量との関係を示す特性図である。FIG. 7 is a characteristic diagram showing the relationship between the welding current and the gas flow rate in the second embodiment of the present invention. 図８は、従来の溶接装置の概略構成を示す正面図である。FIG. 8 is a front view showing a schematic configuration of a conventional welding apparatus.
　以下、本発明の一実施の形態について、図面を参照しながら説明する。以下の図面においては、同じ構成要素については同じ符号を付しているので説明を省略する場合がある。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same components are denoted by the same reference numerals, and the description thereof may be omitted.
　（実施の形態１）
　図１から図３を用いて、本発明の実施の形態１の溶接装置について説明する。図１は、本実施の形態１における溶接装置とその周辺機器の概略構成を示す正面図である。図２は、本実施の形態１におけるガス流量調整装置の概略構成を示す正面図である。図３は、本実施の形態１における溶接装置の要部の概略構成を示す平面図である。 (Embodiment 1)
A welding apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a front view showing a schematic configuration of a welding apparatus and its peripheral devices in the first embodiment. FIG. 2 is a front view showing a schematic configuration of the gas flow rate adjusting device according to the first embodiment. FIG. 3 is a plan view showing a schematic configuration of a main part of the welding apparatus according to the first embodiment.
　図１に示すように、溶接機１は、溶接トーチ１４とガス流量調整装置３に接続されている。ガス流量調整装置３は、ガスレギュレータ６を介してガス供給源であるガスボンベ５に接続されている。なお、溶接装置は、溶接機１とガス流量調整装置３とを少なくとも含んで構成されている。また、配管５ａは、ガスボンベ５から溶接トーチ１４までをつなぐ配管であり、ガスボンベ５から溶接トーチ１４へシールドガスを供給している。 As shown in FIG. 1, the welding machine 1 is connected to a welding torch 14 and a gas flow rate adjusting device 3. The gas flow rate adjusting device 3 is connected to a gas cylinder 5 as a gas supply source via a gas regulator 6. The welding device includes at least the welding machine 1 and the gas flow rate adjusting device 3. The pipe 5 a is a pipe that connects the gas cylinder 5 to the welding torch 14, and supplies a shielding gas from the gas cylinder 5 to the welding torch 14.
　溶接機１には、シールドガスの供給を制御する第１の弁２としてのガスバルブ２が設けられている。ガス流量調整装置３には、シールドガスの供給を制御する第２の弁４としてのガスバルブ４が設けられている。ガスボンベ５には、シールドガスの流量を調整するための流量調整器としてのガスレギュレータ６が設けられている。 The welding machine 1 is provided with a gas valve 2 as a first valve 2 for controlling the supply of shield gas. The gas flow rate adjusting device 3 is provided with a gas valve 4 as a second valve 4 for controlling the supply of shield gas. The gas cylinder 5 is provided with a gas regulator 6 as a flow rate regulator for adjusting the flow rate of the shield gas.
　図２に示すように、ガス流量調整装置３は、シールドガスの供給を制御する第２の弁４としてのガスバルブ４と、ガス流量調整装置３の制御を行う制御部７と、シールドガスの流量を測定する流量センサ８と、を備えている。 As shown in FIG. 2, the gas flow rate adjusting device 3 includes a gas valve 4 as a second valve 4 that controls the supply of shield gas, a control unit 7 that controls the gas flow rate adjusting device 3, and a flow rate of the shield gas. And a flow rate sensor 8 for measuring.
　図３に示すように、溶接機１は、溶接機１の制御を行う溶接制御部９を備えている。そして、溶接機１の溶接制御部９とガス流量調整装置３の制御部７との間で矢印１９に示すように相互に情報のやり取りが行われる。 As shown in FIG. 3, the welding machine 1 includes a welding control unit 9 that controls the welding machine 1. Information is exchanged between the welding control unit 9 of the welding machine 1 and the control unit 7 of the gas flow rate adjusting device 3 as indicated by an arrow 19.
　溶接機１は、図３に示すように記憶部１６と、溶接電流設定部１８と、流量決定部１７と、を備えた構成としている。ここで、記憶部１６は、設定溶接電流とシールドガス流量との定量的関係を対応付けた特性曲線を記憶する。溶接電流設定部１８は、設定溶接電流を設定する。流量決定部１７は、溶接電流設定部１８で設定された設定溶接電流と記憶部１６に記憶されている特性曲線に基づいてシールドガス流量を決定する。 The welding machine 1 is configured to include a storage unit 16, a welding current setting unit 18, and a flow rate determining unit 17, as shown in FIG. Here, the storage unit 16 stores a characteristic curve in which a quantitative relationship between the set welding current and the shield gas flow rate is associated. The welding current setting unit 18 sets a set welding current. The flow rate determination unit 17 determines the shield gas flow rate based on the set welding current set by the welding current setting unit 18 and the characteristic curve stored in the storage unit 16.
　このように、特性曲線を記憶する構成とすることで、シールドガスが設定溶接電流と同期し、自動でシールドガスをコントロールできる。高い溶接電流域と低い溶接電流域では、必要なシールドガス流量が異なる。そのため、低い溶接電流の時はシールドガス使用量が少なくなり、無駄なシールドガスを削減することでコストの削減が可能になる。 As described above, by configuring the characteristic curve to be stored, the shield gas is synchronized with the set welding current, and the shield gas can be controlled automatically. The required shield gas flow rate differs between the high welding current region and the low welding current region. Therefore, when the welding current is low, the amount of shielding gas used is reduced, and the cost can be reduced by reducing wasteful shielding gas.
　以上のように構成された溶接装置について、その動作を説明する。なお、最初に溶接開始時の動作について説明し、次いで、溶接終了時の動作について説明する。 The operation of the welding apparatus configured as described above will be described. First, the operation at the start of welding will be described, and then the operation at the end of welding will be described.
　先ず、本実施の形態１の溶接装置の溶接開始時の動作について説明する。 First, the operation at the start of welding of the welding apparatus of the first embodiment will be described.
　溶接前の準備として、ガスボンベ５に設けられたガスレギュレータ６によりシールドガスの流量を設定する。これにより、ガスボンベ５からガス流量調整装置３のガスバルブ４まで配管５ａを介してシールドガスが流れる。 As a preparation before welding, the flow rate of the shielding gas is set by the gas regulator 6 provided in the gas cylinder 5. As a result, the shield gas flows from the gas cylinder 5 to the gas valve 4 of the gas flow rate adjusting device 3 through the pipe 5a.
　そして、溶接トーチ１４の図示しないトーチスイッチがオンされて、溶接機１が動作を開始すると、予め溶接機１の溶接電流設定部１８において設定された溶接電流指令値に基づいてガス流量出力値が決定される。具体的には、溶接機１の溶接制御部９は、溶接電流指令値とガス流量出力値とを対応付けた特性を、テーブルや数式などの形態で記憶している。そして、溶接制御部９は、設定された溶接電流指令値に基づいてガス流量出力値を決定する。すなわち、溶接制御部９は、設定溶接電流とシールドガス流量とを対応付けた特性を記憶する記憶部１６の機能と、設定溶接電流と記憶している特性に基づいてシールドガス流量を決定する流量決定部１７の機能を有している。そして、決定されたガス流量出力値は、ガス流量調整装置３の制御部７に送られ、制御部７からガスバルブ４に送信される。 When a torch switch (not shown) of the welding torch 14 is turned on and the welding machine 1 starts operating, the gas flow rate output value is set based on the welding current command value set in advance in the welding current setting unit 18 of the welding machine 1. It is determined. Specifically, the welding control unit 9 of the welding machine 1 stores the characteristics in which the welding current command value and the gas flow rate output value are associated with each other in the form of a table or a mathematical expression. And the welding control part 9 determines a gas flow rate output value based on the set welding current command value. That is, the welding control unit 9 determines the shield gas flow rate based on the function of the storage unit 16 that stores the characteristics in which the set welding current and the shield gas flow rate are associated with each other and the set welding current and the stored characteristics. The function of the determination unit 17 is provided. Then, the determined gas flow rate output value is sent to the control unit 7 of the gas flow rate adjusting device 3, and is sent from the control unit 7 to the gas valve 4.
　また、溶接トーチ１４の図示しないトーチスイッチがオンされると、その信号が溶接機１の溶接制御部９に送信され、溶接制御部９はガスバルブ２を制御し、ガスバルブ２を「開」動作させる。ここで、ガスバルブ２は、オン－オフのみを行うものであり、流量調整機能は有していない。 When a torch switch (not shown) of the welding torch 14 is turned on, the signal is transmitted to the welding control unit 9 of the welding machine 1, and the welding control unit 9 controls the gas valve 2 to “open” the gas valve 2. . Here, the gas valve 2 performs only on-off and does not have a flow rate adjusting function.
　なお、溶接制御部９は計時機能を有しており、ガスバルブ２を「開」動作させてからの経過時間を計時し、「開」動作させてから予め決められた第１の所定時間が経過すると、第１の所定時間が経過したことを示す信号をガス流量調整装置３の制御部７に情報として送信する。ここで、第１の所定時間は、例えば１０ｍｓｅｃから１００ｍｓｅｃ程度である。 The welding control unit 9 has a time measuring function, measures the elapsed time after the gas valve 2 is “opened”, and elapses after a predetermined first predetermined time has elapsed since the “open” operation is performed. Then, a signal indicating that the first predetermined time has elapsed is transmitted as information to the control unit 7 of the gas flow rate adjusting device 3. Here, the first predetermined time is, for example, about 10 msec to 100 msec.
　溶接制御部９から第１の所定時間が経過したことを示す信号を受信した制御部７は、ガスバルブ４を制御し、ガスバルブ４を「開」動作させる。ここで、ガスバルブ４は、オン－オフ機能および流量調整機能を有している。 The control unit 7 that has received a signal indicating that the first predetermined time has elapsed from the welding control unit 9 controls the gas valve 4 to “open” the gas valve 4. Here, the gas valve 4 has an on-off function and a flow rate adjustment function.
　以上の動作により、ガスボンベ５から溶接トーチ１４にシールドガスが供給される。 By the above operation, the shield gas is supplied from the gas cylinder 5 to the welding torch 14.
　本実施の形態１の溶接装置では、上述のように、溶接トーチ１４にシールドガスを供給する際、まず、溶接トーチ１４に近い側のガスバルブである溶接機１のガスバルブ２（第１の弁２）を「開」動作させる。それから第１の所定時間が経過すると、ガスボンベ５に近い側のガスバルブであるガス流量調整装置３のガスバルブ４（第２の弁４）を「開」動作させる。これにより、ガス流量調整装置３を備えていない従来の溶接装置と比べ、シールドガスの圧力を抑制することができ、溶接開始時のシールドガスの突出を防止することができる。すなわち、溶接開始時のシールドガスの無駄を抑制することができる。 In the welding apparatus according to the first embodiment, as described above, when supplying the shielding gas to the welding torch 14, first, the gas valve 2 (first valve 2) of the welding machine 1, which is a gas valve close to the welding torch 14, is used. ) “Open”. Then, when the first predetermined time has elapsed, the gas valve 4 (second valve 4) of the gas flow rate adjusting device 3 which is the gas valve on the side close to the gas cylinder 5 is operated to “open”. Thereby, compared with the conventional welding apparatus which is not equipped with the gas flow volume adjusting apparatus 3, the pressure of shield gas can be suppressed and protrusion of the shield gas at the time of a welding start can be prevented. That is, the waste of shielding gas at the start of welding can be suppressed.
　その理由は、ガスバルブ２を「開」動作させることにより、ガスバルブ４から溶接トーチ１４までのシールドガス供給経路の配管５ａ内のシールドガスが溶接トーチ１４側から排出され、この経路内のシールドガスの残留量、すなわち大気圧で換算したときのシールドガスの残留量が低減する。そして、この状態でガスバルブ４を「開」動作させることにより、ガスバルブ４をガスバルブ２より早く「開」動作させない。すなわち、例えばガスバルブ２とガスバルブ４とを同時に「開」動作させる場合よりも、シールドガスの供給圧力が低減される。なぜなら、ガスバルブ２を「開」とした後にガスバルブ４を「開」とすると、ガスバルブ４を「開」とする時に、上述のように配管５ａ内のシールドガスの残留量が低減しているからである。したがって、配管５ａからのシールドガスの突出を防止することができる。 The reason is that by opening the gas valve 2, the shield gas in the pipe 5 a of the shield gas supply path from the gas valve 4 to the welding torch 14 is discharged from the welding torch 14 side, and the shield gas in this path The residual amount, that is, the residual amount of shield gas when converted by atmospheric pressure is reduced. In this state, the gas valve 4 is “opened” to prevent the gas valve 4 from being “opened” earlier than the gas valve 2. That is, for example, the supply pressure of the shield gas is reduced as compared with the case where the gas valve 2 and the gas valve 4 are simultaneously opened. This is because if the gas valve 4 is set to “open” after the gas valve 2 is set to “open”, the residual amount of shielding gas in the pipe 5a is reduced as described above when the gas valve 4 is set to “open”. is there. Accordingly, it is possible to prevent the shielding gas from protruding from the pipe 5a.
　また、他の理由として、溶接機１のガスバルブ２から溶接トーチ１４までの第１のシールドガス供給距離Ｌ１と、ガス流量調整装置３のガスバルブ４から溶接トーチ１４までの第２のシールドガス供給距離Ｌ２とは、第２のシールドガス供給距離Ｌ２の方が長い。そして、従来の溶接装置におけるシールドガス供給距離は第１のシールドガス供給距離Ｌ１に相当し、本実施の形態１の溶接装置におけるシールドガス供給距離は第２のシールドガス供給距離Ｌ２に相当する。シールドガスが配管５ａを介して供給される場合には、その配管５ａの長さが長いほど、シールドガスの圧力は低減されて抑制される。従って、本実施の形態１の溶接装置の方が、シールドガスの圧力を抑制する効果が高く、溶接開始時のシールドガスの無駄を抑制することができる。 As other reasons, the first shield gas supply distance L1 from the gas valve 2 of the welding machine 1 to the welding torch 14 and the second shield gas supply distance from the gas valve 4 of the gas flow rate adjusting device 3 to the welding torch 14 are also described. The second shield gas supply distance L2 is longer than L2. The shield gas supply distance in the conventional welding apparatus corresponds to the first shield gas supply distance L1, and the shield gas supply distance in the welding apparatus of the first embodiment corresponds to the second shield gas supply distance L2. When the shield gas is supplied via the pipe 5a, the longer the pipe 5a is, the lower the pressure of the shield gas is suppressed. Therefore, the welding apparatus of the first embodiment has a higher effect of suppressing the pressure of the shield gas, and can suppress the waste of the shield gas at the start of welding.
　なお、溶接機１は、ガスボンベ５と直接接続されて使用される場合もあり、汎用性を考慮して内部にガスバルブ２が設けられており、このようにガスバルブ２を備えた溶接機１は広く知られている。そして、本実施の形態１の溶接装置は、このようなガスバルブ２を備えた溶接機１を備えた溶接装置に関するものである。 Note that the welder 1 may be used by being directly connected to the gas cylinder 5, and the gas valve 2 is provided inside in consideration of versatility. Thus, the welder 1 including the gas valve 2 is widely used. Are known. And the welding apparatus of this Embodiment 1 is related with the welding apparatus provided with the welding machine 1 provided with such a gas valve 2. FIG.
　すなわち、本実施の形態１の溶接装置は、ガス供給源５から溶接トーチ１４に至るまでのシールドガスの供給経路の途中に溶接機を有する溶接装置である。本実施の形態１の溶接装置は、シールドガスの供給経路に第１の弁２および第２の弁４を含む少なくとも２つの弁を直列に設け、第１の弁２を溶接トーチ１４に近い側に配置し、第２の弁４をガス供給源５に近い側に配置している。そして、本実施の形態１の溶接装置は、溶接トーチ１４にシールドガスを供給する際に、第１の弁２を開とし、第１の弁２を開としてから第１の所定時間が経過した後に、第２の弁４を開とする構成からなる。 That is, the welding apparatus according to the first embodiment is a welding apparatus having a welding machine in the middle of the shield gas supply path from the gas supply source 5 to the welding torch 14. In the welding apparatus according to the first embodiment, at least two valves including the first valve 2 and the second valve 4 are provided in series in the shield gas supply path, and the first valve 2 is closer to the welding torch 14. The second valve 4 is arranged on the side close to the gas supply source 5. And when the welding apparatus of this Embodiment 1 supplies shield gas to the welding torch 14, the 1st predetermined time passed since the 1st valve 2 was opened and the 1st valve 2 was opened. Later, the second valve 4 is opened.
　この構成により、溶接開始時のガスの突出を防止して、シールドガスの無駄を抑制することができる。 This configuration can prevent gas from protruding at the start of welding and suppress waste of shielding gas.
　次に、溶接終了時の動作について説明する。 Next, the operation at the end of welding will be described.
　溶接終了に際し、溶接トーチ１４の図示しないトーチスイッチがオフされると、オフされたことを示す信号が溶接機１の溶接制御部９に入力される。そして、溶接制御部９は、この信号をガス流量調整装置３の制御部７に送る。溶接制御部９からの信号を受信した制御部７は、ガス流量調整装置３のガスバルブ４を制御して「閉」動作させる。 When a torch switch (not shown) of the welding torch 14 is turned off at the end of welding, a signal indicating that the welding torch 14 is turned off is input to the welding control unit 9 of the welding machine 1. Then, the welding control unit 9 sends this signal to the control unit 7 of the gas flow rate adjusting device 3. The control unit 7 that has received the signal from the welding control unit 9 controls the gas valve 4 of the gas flow rate adjusting device 3 to perform a “closed” operation.
　なお、制御部７は計時機能を有しており、ガスバルブ４を「閉」動作させてからの経過時間を計時し、「閉」動作させてから予め決められた第２の所定時間が経過すると、第２の所定時間が経過したことを溶接機１の溶接制御部９に送信する。ここで、第２の所定時間は、例えば１０ｍｓｅｃから１００ｍｓｅｃ程度である。 The control unit 7 has a time measuring function, measures the elapsed time after the gas valve 4 is “closed”, and when a predetermined second predetermined time elapses after the “close” operation. Then, the fact that the second predetermined time has passed is transmitted to the welding control unit 9 of the welding machine 1. Here, the second predetermined time is, for example, about 10 msec to 100 msec.
　制御部７から第２の所定時間が経過したことを示す信号を受信した溶接制御部９は、ガスバルブ２を制御し、ガスバルブ２を「閉」動作させる。 The welding control unit 9 that has received a signal indicating that the second predetermined time has elapsed from the control unit 7 controls the gas valve 2 and causes the gas valve 2 to be “closed”.
　以上の動作により、ガスボンベ５から溶接トーチ１４に供給されるシールドガスの供給が停止される。 By the above operation, the supply of the shielding gas supplied from the gas cylinder 5 to the welding torch 14 is stopped.
　本実施の形態１の溶接装置では、上述のように、溶接トーチ１４へのシールドガスの供給を停止する際に、ガスボンベ５に近い側のガスバルブであるガス流量調整装置３のガスバルブ４（第２の弁４）を「閉」動作させる。それから第２の所定時間が経過すると、本実施の形態１の溶接装置は、溶接トーチ１４に近い側のガスバルブである溶接機１のガスバルブ２（第１の弁２）を「閉」動作させる。 In the welding apparatus according to the first embodiment, as described above, when the supply of the shielding gas to the welding torch 14 is stopped, the gas valve 4 (second valve) of the gas flow rate adjusting apparatus 3 that is a gas valve close to the gas cylinder 5 is used. The valve 4) is closed. Then, when the second predetermined time has elapsed, the welding apparatus according to the first embodiment causes the gas valve 2 (first valve 2) of the welding machine 1, which is a gas valve close to the welding torch 14, to be "closed".
　これにより、大気圧よりも十分に高い圧力のシールドガスがガスバルブ４からガスバルブ２までの配管５ａに閉じ込められることなく、溶接トーチ１４から大気に放出され、この配管５ａ内のシールドガスの圧力は、大気圧と同等程度に低減される。したがって、ガス流量調整装置３のガスバルブ４から溶接トーチ１４に至るシールドガス供給経路の配管５ａ内に残留するシールドガス、すなわち大気圧で換算したときのシールドガスの残留量を低減することができる。そして、このように残留するシールドガスを低減することで、次回の溶接開始の際のシールドガスの突出の抑制に寄与することができる。すなわち、溶接開始時のシールドガスの無駄を抑制することができる。 Thereby, the shield gas having a pressure sufficiently higher than the atmospheric pressure is released from the welding torch 14 to the atmosphere without being confined in the pipe 5a from the gas valve 4 to the gas valve 2, and the pressure of the shield gas in the pipe 5a is Reduced to the same level as atmospheric pressure. Therefore, the shield gas remaining in the pipe 5a of the shield gas supply path from the gas valve 4 of the gas flow rate adjusting device 3 to the welding torch 14, that is, the residual amount of shield gas when converted to atmospheric pressure can be reduced. And by reducing the shield gas which remains in this way, it can contribute to suppression of the protrusion of the shield gas at the time of the next welding start. That is, the waste of shielding gas at the start of welding can be suppressed.
　以上のように、本実施の形態１の溶接装置では、溶接機１とガスボンベ５との間にガス流量調整装置３を設けている。そして、本実施の形態１の溶接装置では、溶接トーチ１４にシールドガスを供給する際、溶接機１に設けられたガスバルブ２（第１の弁２）を「開」として第１の所定時間後にガス流量調整装置３に設けられたガスバルブ４（第２の弁４）を「開」とする例を示した。 As described above, in the welding apparatus of the first embodiment, the gas flow rate adjusting device 3 is provided between the welding machine 1 and the gas cylinder 5. And in the welding apparatus of this Embodiment 1, when supplying shielding gas to the welding torch 14, the gas valve 2 (1st valve 2) provided in the welding machine 1 is made "open", and after 1st predetermined time. The example which made the gas valve 4 (2nd valve 4) provided in the gas flow control apparatus 3 "open" was shown.
　しかし、ガス流量調整装置３を溶接機１と溶接トーチ１４との間に設けるようにしてもよい。この場合、溶接トーチ１４にシールドガスを供給する際には、ガス流量調整装置３に設けられたガスバルブ４を第１の弁として、「開」としてから第１の所定時間後に溶接機１に設けられたガスバルブ２を第２の弁として、「開」とする。 However, the gas flow rate adjusting device 3 may be provided between the welding machine 1 and the welding torch 14. In this case, when supplying the shielding gas to the welding torch 14, the gas valve 4 provided in the gas flow rate adjusting device 3 is provided as the first valve in the welding machine 1 after a first predetermined time after being “opened”. The gas valve 2 thus made is set to “open” as the second valve.
　すなわち、ガスボンベ５から溶接トーチ１４に至るまでのシールドガスの供給経路の途中に第１の弁および第２の弁を含む少なくとも２つの弁を直列に設ける。そして、溶接トーチ１４にシールドガスを供給する際には、溶接トーチ１４に近い側の第１の弁を「開」とし、この「開」としてから第１の所定時間が経過した後にガスボンベ５に近い側の第２の弁を「開」とすればよい。 That is, at least two valves including a first valve and a second valve are provided in series in the shield gas supply path from the gas cylinder 5 to the welding torch 14. When supplying the shielding gas to the welding torch 14, the first valve on the side close to the welding torch 14 is set to “open”, and after the first predetermined time has elapsed since this “opening”, the gas cylinder 5 is supplied. The second valve on the near side may be “open”.
　また、溶接トーチ１４へのシールドガスの供給を停止する際も同様に、ガスボンベ５に近い側の第２の弁を「閉」とし、この「閉」としてから第２の所定時間が経過した後に溶接トーチ１４に近い側の第２の弁を「閉」とすればよい。 Similarly, when the supply of the shielding gas to the welding torch 14 is stopped, the second valve on the side close to the gas cylinder 5 is set to “closed”, and after this “closed”, a second predetermined time has elapsed. The second valve close to the welding torch 14 may be “closed”.
　この構成により、溶接開始時のガスの突出を防止して、シールドガスの無駄を抑制することができる。なお、溶接装置は、上述の第１の弁および第２の弁以外の、例えばガスバルブ等の弁をさらに備えた構成としてもよい。 This configuration can prevent gas from protruding at the start of welding and suppress waste of shielding gas. The welding apparatus may further include a valve such as a gas valve other than the first valve and the second valve described above.
　（実施の形態２）
　本発明の実施の形態２について、図４から図７を用いて説明する。図４は、溶接機の外観を示す斜視図である。図５は、溶接機の操作部の概略構成を示す正面図である。図６は、溶接電流とガス流量との関係を示す特性図である。図７は、図６の特性から変更された溶接電流とガス流量との関係を示す特性図である。 (Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a perspective view showing the appearance of the welder. FIG. 5 is a front view illustrating a schematic configuration of an operation unit of the welding machine. FIG. 6 is a characteristic diagram showing the relationship between the welding current and the gas flow rate. FIG. 7 is a characteristic diagram showing the relationship between the welding current and the gas flow rate changed from the characteristics shown in FIG.
　本実施の形態２の溶接装置が、実施の形態１と異なる主な点は、設定された溶接電流指令値に基づいて決定されたガス流量を変更可能とした点と、ガス流量を変更したことにより溶接電流指令値とガス流量出力値とを対応付けた特性を変更するようにした点である。 The main difference between the welding apparatus of the second embodiment and the first embodiment is that the gas flow rate determined based on the set welding current command value can be changed, and the gas flow rate has been changed. Thus, the characteristic in which the welding current command value and the gas flow rate output value are associated with each other is changed.
　図４に示すように、溶接機１は、操作部１５をさらに備えている。なお、溶接機１は、その内部に実施の形態１と同様に溶接制御部９を有し、記憶部１６、流量決定部１７および溶接電流設定部１８を備えている。 As shown in FIG. 4, the welding machine 1 further includes an operation unit 15. Note that the welding machine 1 includes a welding control unit 9 in the same manner as in the first embodiment, and includes a storage unit 16, a flow rate determination unit 17, and a welding current setting unit 18.
　図５に示すように、操作部１５には、溶接電流設定部１８の一部としての電流設定ボタン１０と、シールドガスの流量変更部２０の一部としてのガス流量設定ボタン１１と、表示部１２と、ジョグダイヤル１３と、が設けられている。ここで、表示部１２は、溶接電流の値やガス流量の値等を表示する。ジョグダイヤル１３は、溶接電流の値やガス流量の値を変更する。また、溶接電流設定部１８および流量変更部２０には、溶接電流の値やガス流量の値などを入力するためのテンキーが操作部１５の表面に備えられていてもよい。 As shown in FIG. 5, the operation unit 15 includes a current setting button 10 as a part of the welding current setting unit 18, a gas flow rate setting button 11 as a part of the shield gas flow rate changing unit 20, and a display unit. 12 and a jog dial 13 are provided. Here, the display unit 12 displays a welding current value, a gas flow rate value, and the like. The jog dial 13 changes the value of the welding current and the value of the gas flow rate. Further, the welding current setting unit 18 and the flow rate changing unit 20 may be provided with a numeric keypad on the surface of the operation unit 15 for inputting a welding current value, a gas flow rate value, and the like.
　したがって、図４に示す溶接機１は、流量決定部１７で決定されたシールドガス流量を変更する流量変更部２０を備えた構成としている。このように、流量変更部２０を備える構成とすることで、設定溶接電流に対するシールドガス流量を自由に設定できる。従って、溶接条件によってシールドガス使用量が減り、更なるコストの削減が可能である。 Therefore, the welding machine 1 shown in FIG. 4 is configured to include the flow rate changing unit 20 that changes the shield gas flow rate determined by the flow rate determining unit 17. Thus, by setting it as the structure provided with the flow volume change part 20, the shield gas flow volume with respect to setting welding current can be set freely. Therefore, the amount of shield gas used is reduced depending on the welding conditions, and further cost reduction is possible.
　先ず、溶接電流の設定とガス流量の決定について説明する。 First, the setting of the welding current and the determination of the gas flow rate will be described.
　図５の電流設定ボタン１０を押すと、溶接電流を設定するモードとなる。そして、ジョグダイヤル１３を回して表示部１２に表示される溶接電流を設定したい値に合わせる。この状態で、再度、電流設定ボタン１０を押すと、溶接電流が表示された値に設定される。 When the current setting button 10 in FIG. 5 is pressed, the welding current is set. Then, the jog dial 13 is turned to adjust the welding current displayed on the display unit 12 to a value to be set. When the current setting button 10 is pressed again in this state, the welding current is set to the displayed value.
　溶接制御部９は、図６に示す溶接電流の電流値とシールドガスのガス流量との関係を示す特性を、テーブルあるいは数式等として予め記憶部１６に記憶している。なお、図６は、特性が一次曲線（直線）で表される一例を示している。溶接制御部９は、この特性と設定された溶接電流の電流値に基づいてガス流量を決定する。決定されたガス流量は、表示部１２に表示される。 The welding control unit 9 stores characteristics indicating the relationship between the current value of the welding current shown in FIG. 6 and the gas flow rate of the shielding gas in the storage unit 16 in advance as a table or a mathematical expression. FIG. 6 shows an example in which the characteristic is represented by a linear curve (straight line). The welding control unit 9 determines the gas flow rate based on this characteristic and the set current value of the welding current. The determined gas flow rate is displayed on the display unit 12.
　次に、上記で決定されたガス流量を変更する場合について説明する。 Next, the case where the gas flow rate determined above is changed will be described.
　例えば、設定溶接電流として４０Ａが設定された場合、図６より、ガス流量は４Ｌ／ｍｉｎと決定される。このガス流量を、１Ｌ／ｍｉｎに変更したい場合について説明する。 For example, when 40 A is set as the set welding current, the gas flow rate is determined to be 4 L / min from FIG. A case where it is desired to change the gas flow rate to 1 L / min will be described.
　上記のようにして設定溶接電流を４０Ａに設定すると、ガス流量が４Ｌ／ｍｉｎと決定され、設定溶接電流の値である４０Ａとガス流量の値である４Ｌ／ｍｉｎが、表示部１２に表示される。この状態で、ガス流量設定ボタン１１を押すと、ガス流量が変更可能なモードとなる。そして、ジョグダイヤル１３を回して表示部１２に表示されるガス流量を設定したい値、ここでは、１Ｌ／ｍｉｎに合わせる。その状態で、再度、ガス流量設定ボタン１１を押すと、新たなガス流量が次に示すように設定される。 When the set welding current is set to 40 A as described above, the gas flow rate is determined to be 4 L / min, and the set welding current value of 40 A and the gas flow rate value of 4 L / min are displayed on the display unit 12. The In this state, when the gas flow rate setting button 11 is pressed, the gas flow rate can be changed. Then, the jog dial 13 is turned to adjust the gas flow rate displayed on the display unit 12 to a value to be set, here 1 L / min. When the gas flow rate setting button 11 is pressed again in this state, a new gas flow rate is set as shown below.
　また、本実施の形態２の溶接機１は、上述のようにガス流量を変更すると、その変更に基づいて新たな溶接電流とガス流量との関係を示す特性を作成して溶接制御部９の記憶部１６に記憶し、この新たな特性に基づいて溶接を行う機能を有している。以下にその詳細を説明する。 In addition, when the gas flow rate is changed as described above, the welding machine 1 according to the second embodiment creates a characteristic indicating a new relationship between the welding current and the gas flow rate based on the change, and the welding controller 9 It has a function of storing in the storage unit 16 and performing welding based on this new characteristic. Details will be described below.
　上述のように溶接電流４０Ａのときのガス流量を１Ｌ／ｍｉｎに変更すると、溶接制御部９は、変更されたガス流量の値と図６に示す特性に基づいて、図７に示す新たな特性を作成して溶接制御部９の記憶部１６に記憶する。 As described above, when the gas flow rate at the welding current of 40A is changed to 1 L / min, the welding control unit 9 creates new characteristics shown in FIG. 7 based on the changed value of the gas flow rate and the characteristics shown in FIG. Is stored in the storage unit 16 of the welding control unit 9.
　より具体的には、図７に示すように溶接電流４０Ａと変更されたガス流量１Ｌ／ｍｉｎで示される位置を第２の変極点とする。そして、溶接電流４０Ａから所定値２０Ａだけ小さい溶接電流が２０Ａとガス流量が２Ｌ／ｍｉｎで示される位置を第１の変極点とする。そして、溶接電流４０Ａから所定値２０Ａだけ大きい溶接電流が６０Ａとガス流量が６Ｌ／ｍｉｎで示される位置を第３の変極点とする。このように３つの変極点を決定した後に、第１の変極点と第２の変極点との間を直線補完し、第２の変極点と第３の変極点との間を直線補完した新たな折れ線型の特性曲線を作成し、図７に示す特性曲線として溶接制御部９の記憶部１６に記憶する。なお、所定値２０Ａは、一例で、これに限るものではなく、実験等により適切な値を予め求めて設定するようにしておけばよい。また、溶接電流を小さくする側と大きくする側とで、所定値が異なっても良い。 More specifically, as shown in FIG. 7, the position indicated by the welding current 40A and the changed gas flow rate 1 L / min is set as the second inflection point. A position where the welding current 20A smaller than the welding current 40A by 20A and the gas flow rate is 2 L / min is defined as a first inflection point. The position where the welding current larger than the welding current 40A by a predetermined value 20A is 60A and the gas flow rate is 6 L / min is defined as a third inflection point. After determining the three inflection points in this way, a new line is obtained by linear interpolation between the first inflection point and the second inflection point, and linear interpolation between the second inflection point and the third inflection point. A polygonal characteristic curve is created and stored in the storage unit 16 of the welding control unit 9 as the characteristic curve shown in FIG. The predetermined value 20A is an example and is not limited to this, and an appropriate value may be obtained and set in advance through experiments or the like. Further, the predetermined value may be different between the side where the welding current is reduced and the side where the welding current is increased.
　そして、新たに設定電流が設定される、あるいは、新たにガス流量が変更されるまでは、この図７に示す新たな特性曲線に基づいてガス流量が決定される。 The gas flow rate is determined based on the new characteristic curve shown in FIG. 7 until a new set current is set or the gas flow rate is newly changed.
　すなわち、本実施の形態２の溶接装置において、記憶部１６に記憶された特性曲線は一次曲線であり、流量変更部２０でシールドガス流量を変更すると、設定溶接電流と変更されたシールドガス流量との関係が示す位置を第２の変極点とする。そして、設定溶接電流から第１の所定値だけ小さい溶接電流値と一次曲線との交点を第１の変極点とし、設定溶接電流から第２の所定値だけ大きい溶接電流値と一次曲線との交点を第３の変極点とする。そして、第１の変極点と第２の変極点との間を直線補完し、かつ、第２の変極点と第３の変極点との間を直線補完した新たな特性曲線を作成する。このようにした後に、本実施の形態２の溶接装置は、設定溶接電流を変更するまでは、新たな特性曲線に基づいてシールドガス流量を決定する構成としている。 That is, in the welding apparatus according to the second embodiment, the characteristic curve stored in the storage unit 16 is a linear curve, and when the flow rate change unit 20 changes the shield gas flow rate, the set welding current and the changed shield gas flow rate The position indicated by the relationship is the second inflection point. The intersection between the welding current value smaller than the set welding current by the first predetermined value and the primary curve is taken as the first inflection point, and the intersection between the welding current value larger than the set welding current by the second predetermined value and the primary curve. Is the third inflection point. Then, a new characteristic curve is created by linear interpolation between the first inflection point and the second inflection point and linear interpolation between the second inflection point and the third inflection point. After doing in this way, the welding apparatus of this Embodiment 2 is set as the structure which determines a shield gas flow volume based on a new characteristic curve until it changes a setting welding current.
　この構成により、予め記憶された基本の特性に基づいて決定されたガス流量を変更する機能を有しているので、溶接対象に応じたガス流量を設定できる。これにより、シールドガスの無駄を削減することも可能となる。また、変更したガス流量に基づいて新たな特性曲線を作成し、この新たな特性曲線に基づき、設定されている溶接電流に応じてガス流量を決定して溶接を行うことができる。これにより、新たな特性曲線を作成して用いない場合と比べて安定した溶接を行うことができる。 This configuration has a function of changing the gas flow rate determined based on the basic characteristics stored in advance, so that the gas flow rate can be set according to the welding target. Thereby, it becomes possible to reduce the waste of shielding gas. Further, a new characteristic curve can be created based on the changed gas flow rate, and welding can be performed by determining the gas flow rate according to the set welding current based on the new characteristic curve. Thereby, stable welding can be performed as compared with the case where a new characteristic curve is not created and used.
　次に、この新たな特性曲線に基づいてガス流量が決定される例について説明する。 Next, an example in which the gas flow rate is determined based on this new characteristic curve will be described.
　まず、溶接機１の操作部１５を用いて、定常溶接期間の定常溶接電流（例えば、４０Ａ）と、定常溶接期間の前の期間である初期期間の初期溶接電流（例えば、１０Ａ）と、定常溶接電流の後の期間である終期期間の終期溶接電流（例えば、５０Ａ）を設定しておく。そして、定常溶接電流４０Ａのガス流量を４Ｌ／ｍｉｎから１Ｌ／ｍｉｎに変更すると、上記のように、図６に示す特性曲線を基にして図７に示す特性曲線が作成される。 First, using the operation unit 15 of the welding machine 1, a steady welding current (for example, 40A) in a steady welding period, an initial welding current (for example, 10A) in an initial period that is a period before the steady welding period, An end welding current (for example, 50 A) of an end period that is a period after the welding current is set. When the gas flow rate of the steady welding current 40A is changed from 4 L / min to 1 L / min, the characteristic curve shown in FIG. 7 is created based on the characteristic curve shown in FIG.
　ここで、初期溶接電流は１０Ａと設定されているので、図７の特性曲線に基づいて、初期期間のガス流量は１Ｌ／ｍｉｎと決定される。なお、この場合は、図６の特性曲線の場合と同じガス流量の値となる。また、定常溶接電流は４０Ａと設定されているので、図７の特性曲線に基づいて、定常溶接期間のガス流量は１Ｌ／ｍｉｎと決定される。なお、この場合は、図６の特性曲線の場合と比べてガス流量は低い値となる。また、終期溶接電流は５０Ａと設定されているので、図７の特性曲線に基づいて、終期期間のガス流量は３．５Ｌ／ｍｉｎと決定される。なお、この場合は、図６の特性曲線の場合と比べてガス流量は低い値となる。 Here, since the initial welding current is set to 10 A, the gas flow rate in the initial period is determined to be 1 L / min based on the characteristic curve of FIG. In this case, the value of the gas flow rate is the same as that in the case of the characteristic curve of FIG. Since the steady welding current is set to 40 A, the gas flow rate during the steady welding period is determined to be 1 L / min based on the characteristic curve of FIG. In this case, the gas flow rate is lower than that in the case of the characteristic curve of FIG. Since the final welding current is set to 50 A, the gas flow rate in the final period is determined to be 3.5 L / min based on the characteristic curve of FIG. In this case, the gas flow rate is lower than that in the case of the characteristic curve of FIG.
　ここで、上述のように変極点間を直線補完して特性曲線を作成することで、ガス流量の変更（ここでは、ガス流量の低減）を行った溶接電流（ここでは、４０Ａ）の近傍の溶接電流（２０Ａから６０Ａの範囲の溶接電流）に対応して決められるガス流量も低減された値となる。これにより、溶接電流の変化（２０Ａから６０Ａ）に対するガス流量の変化が、図６の特性曲線の場合と比べて小さくなり、図６の特性曲線を用いる場合と比べて安定した溶接を行うことができる。 Here, the characteristic curve is created by linear interpolation between the inflection points as described above, so that the vicinity of the welding current (here, 40 A) in which the gas flow rate is changed (here, the gas flow rate is reduced) is changed. The gas flow rate determined corresponding to the welding current (welding current in the range of 20A to 60A) is also a reduced value. Thereby, the change of the gas flow rate with respect to the change of the welding current (20A to 60A) becomes smaller than that in the case of the characteristic curve of FIG. 6, and stable welding can be performed as compared with the case of using the characteristic curve of FIG. it can.
　すなわち、本実施の形態２の溶接装置は、溶接電流設定部１８により、定常溶接期間の定常溶接電流と、この定常溶接期間の前の期間である初期期間の初期溶接電流と、定常溶接期間の後の期間である終期期間の終期溶接電流と、を設定しておく。そして、流量変更部２０で定常溶接期間のシールドガス流量を変更すると、本実施の形態２の溶接装置は、新たな特性曲線を作成する。そうすると、初期溶接電流に対応するシールドガス流量と終期溶接電流に対応するシールドガス流量は、新たな特性曲線に基づいて決定される構成としてもよい。 That is, in the welding apparatus of the second embodiment, the welding current setting unit 18 causes the steady welding current in the steady welding period, the initial welding current in the initial period that is the period before the steady welding period, and the steady welding period. The final welding current in the final period, which is a later period, is set. When the flow rate changing unit 20 changes the shield gas flow rate during the steady welding period, the welding apparatus of the second embodiment creates a new characteristic curve. Then, the shield gas flow rate corresponding to the initial welding current and the shield gas flow rate corresponding to the final welding current may be determined based on a new characteristic curve.
　この構成により、変更したガス流量に基づいて新たな特性曲線を作成し、この新たな特性曲線に基づき、設定されている溶接電流に応じてガス流量を決定して溶接を行うことができる。これにより、新たな特性曲線を作成して用いない場合と比べて安定した溶接を行うことができる。 With this configuration, a new characteristic curve can be created based on the changed gas flow rate, and welding can be performed by determining the gas flow rate according to the set welding current based on the new characteristic curve. Thereby, stable welding can be performed as compared with the case where a new characteristic curve is not created and used.
　以上のように、本実施の形態２の溶接機１によれば、溶接対象に応じたガス流量を設定できるので、シールドガスの無駄を削減することも可能となる。また、ガス流量を変更すると新たな特性曲線を作成し、設定されている溶接電流に応じて、この新たな特性曲線に基づきガス流量を決定する。これにより、溶接電流の変化に対するガス流量の変化が小さくなり、安定した溶接を行うことができる。 As described above, according to the welding machine 1 of the second embodiment, the gas flow rate corresponding to the welding target can be set, so that the waste of shielding gas can be reduced. When the gas flow rate is changed, a new characteristic curve is created, and the gas flow rate is determined based on the new characteristic curve according to the set welding current. Thereby, the change of the gas flow rate with respect to the change of the welding current is reduced, and stable welding can be performed.
　なお、実施の形態１と実施の形態２において、ガス流量調整装置３は、溶接機１の表面に取り付けるようにしても良い。あるいは、ガス流量調整装置３は、溶接機１と離れた位置に設けるようにしても良い。あるいは、ガス流量調整装置３は、溶接機１の内部に設けるようにしても良い。このような構成とすることで、大掛かりな工事や設備変更の必要がなく、設置が容易となる。 In the first and second embodiments, the gas flow rate adjusting device 3 may be attached to the surface of the welding machine 1. Alternatively, the gas flow rate adjusting device 3 may be provided at a position away from the welding machine 1. Alternatively, the gas flow rate adjusting device 3 may be provided inside the welding machine 1. By adopting such a configuration, there is no need for large-scale construction and equipment change, and installation becomes easy.
　また、実施の形態１と実施の形態２において、第１の弁２は、溶接機１に設けられ、第２の弁４は、ガス供給源５と溶接機１との間に設けられておりシールドガスの供給を制御するためのガス流量調整装置３に設けられた構成としてもよい。 In the first and second embodiments, the first valve 2 is provided in the welding machine 1, and the second valve 4 is provided between the gas supply source 5 and the welding machine 1. It is good also as a structure provided in the gas flow volume adjustment apparatus 3 for controlling supply of shield gas.
　このような構成が、ガスの突出抑制やトーチ等への干渉の抑制、設置工事の手間の削減、コスト削減などの観点に鑑み、最適な組み合わせである。 Such a configuration is an optimal combination in view of suppression of gas protrusion, interference with a torch, etc., reduction of installation work, and cost reduction.
　本発明によれば、溶接開始時のガスの突出を防止して、シールドガスの無駄を抑制することができ、シールドガスを制御するための弁を有する溶接機を備えた溶接装置として産業上有用である。 According to the present invention, it is possible to prevent gas from protruding at the start of welding, suppress waste of shielding gas, and industrially useful as a welding apparatus including a welding machine having a valve for controlling shielding gas. It is.
　１　　溶接機
　２　　ガスバルブ（第１の弁）
　３　　ガス流量調整装置
　４　　ガスバルブ（第２の弁）
　５　　ガスボンベ（ガス供給源）
　５ａ　　配管
　６　　ガスレギュレータ（流量調整器）
　７　　制御部
　８　　流量センサ
　９　　溶接制御部
　１０　　電流設定ボタン
　１１　　ガス流量設定ボタン
　１２　　表示部
　１３　　ジョグダイヤル
　１４　　溶接トーチ
　１５　　操作部
　１６　　記憶部
　１７　　流量決定部
　１８　　溶接電流設定部
　１９　　矢印
　２０　　流量変更部 1 Welding machine 2 Gas valve (first valve)
3 Gas flow control device 4 Gas valve (second valve)
5 Gas cylinder (gas supply source)
5a Piping 6 Gas regulator (flow rate regulator)
DESCRIPTION OF SYMBOLS 7 Control part 8 Flow sensor 9 Welding control part 10 Current setting button 11 Gas flow rate setting button 12 Display part 13 Jog dial 14 Welding torch 15 Operation part 16 Memory | storage part 17 Flow rate determination part 18 Welding current setting part 19 Arrow 20 Flow rate change part

Claims (9)

  1. ガス供給源から溶接トーチに至るまでのシールドガスの供給経路の途中に溶接機を有する溶接装置であって、
    前記シールドガスの供給経路に第１の弁および第２の弁を含む少なくとも２つの弁を直列に設け、
    前記第１の弁を前記溶接トーチに近い側に配置し、前記第２の弁を前記ガス供給源に近い側に配置し、
    前記溶接トーチに前記シールドガスを供給する際に、前記第１の弁を開とし、前記第１の弁を開としてから第１の所定時間が経過した後に、前記第２の弁を開とする溶接装置。     A welding device having a welding machine in the middle of a shield gas supply path from a gas supply source to a welding torch,
    At least two valves including a first valve and a second valve are provided in series in the shield gas supply path;
    The first valve is disposed on the side closer to the welding torch, the second valve is disposed on the side closer to the gas supply source,
    When supplying the shielding gas to the welding torch, the first valve is opened, and after the first predetermined time has elapsed since the first valve is opened, the second valve is opened. Welding equipment.
  2. 前記溶接トーチへの前記シールドガスの供給を停止する際に、前記第２の弁を閉とし、前記第２の弁を閉としてから第２の所定時間が経過した後に、前記第１の弁を閉とする請求項１記載の溶接装置。 When stopping the supply of the shielding gas to the welding torch, the second valve is closed, and after the second predetermined time has elapsed since the second valve was closed, the first valve is turned on. The welding apparatus according to claim 1, wherein the welding apparatus is closed.
  3. 前記溶接機は、
    　設定溶接電流とシールドガス流量との定量的関係を対応付けた特性曲線を記憶する記憶部と、
    　前記設定溶接電流を設定するための溶接電流設定部と、
    　前記溶接電流設定部で設定された前記設定溶接電流と前記記憶部に記憶されている前記特性曲線に基づいて前記シールドガス流量を決定する流量決定部と、
    を備えた請求項１記載の溶接装置。     The welder is
    A storage unit for storing a characteristic curve in which a quantitative relationship between the set welding current and the shield gas flow rate is associated;
    A welding current setting unit for setting the set welding current;
    A flow rate determining unit that determines the shield gas flow rate based on the set welding current set by the welding current setting unit and the characteristic curve stored in the storage unit;
    The welding apparatus according to claim 1, further comprising:
  4. 前記溶接機は、
    　設定溶接電流とシールドガス流量との定量的関係を対応付けた特性曲線を記憶する記憶部と、
    　前記設定溶接電流を設定するための溶接電流設定部と、
    　前記溶接電流設定部で設定された前記設定溶接電流と前記記憶部に記憶されている前記特性曲線に基づいて前記シールドガス流量を決定する流量決定部と、
    　を備えた請求項２記載の溶接装置。     The welder is
    A storage unit for storing a characteristic curve in which a quantitative relationship between the set welding current and the shield gas flow rate is associated;
    A welding current setting unit for setting the set welding current;
    A flow rate determining unit that determines the shield gas flow rate based on the set welding current set by the welding current setting unit and the characteristic curve stored in the storage unit;
    The welding apparatus according to claim 2, comprising:
  5. 前記溶接機は、前記流量決定部で決定された前記シールドガス流量を変更する流量変更部を備えた請求項３記載の溶接装置。 The welding apparatus according to claim 3, wherein the welding machine includes a flow rate changing unit that changes the shielding gas flow rate determined by the flow rate determining unit.
  6. 前記記憶部に記憶された前記特性曲線は一次曲線であり、
    前記流量変更部で前記シールドガス流量を変更すると、前記設定溶接電流と変更された前記シールドガス流量との関係が示す位置を第２の変極点とし、
    前記設定溶接電流から第１の所定値だけ小さい溶接電流値と前記一次曲線との交点を第１の変極点とし、
    前記設定溶接電流から第２の所定値だけ大きい溶接電流値と前記一次曲線との交点を第３の変極点とし、
    前記第１の変極点と前記第２の変極点との間を直線補完し、かつ、前記第２の変極点と前記第３の変極点との間を直線補完した新たな特性曲線を作成し、前記設定溶接電流を変更するまでは、前記新たな特性曲線に基づいて前記シールドガス流量を決定する請求項５記載の溶接装置。     The characteristic curve stored in the storage unit is a linear curve,
    When changing the shield gas flow rate in the flow rate change unit, the position indicated by the relationship between the set welding current and the changed shield gas flow rate is a second inflection point,
    The intersection of the welding current value that is smaller than the set welding current by a first predetermined value and the primary curve is the first inflection point,
    The intersection of the welding current value larger than the set welding current by a second predetermined value and the primary curve is the third inflection point,
    A new characteristic curve is created by linear interpolation between the first inflection point and the second inflection point, and linear interpolation between the second inflection point and the third inflection point. The welding apparatus according to claim 5, wherein the shield gas flow rate is determined based on the new characteristic curve until the set welding current is changed.
  7. 前記溶接電流設定部により、定常溶接期間の定常溶接電流と、前記定常溶接期間の前の期間である初期期間の初期溶接電流と、前記定常溶接期間の後の期間である終期期間の終期溶接電流と、を設定しておき、
    前記流量変更部で前記定常溶接期間のシールドガス流量を変更すると、新たな特性曲線を作成し、前記初期溶接電流に対応するシールドガス流量と前記終期溶接電流に対応するシールドガス流量は、前記新たな特性曲線に基づいて決定される請求項６記載の溶接装置。     By the welding current setting unit, the steady welding current in the steady welding period, the initial welding current in the initial period that is the period before the steady welding period, and the final welding current in the final period that is the period after the steady welding period. And set
    When the flow rate change unit changes the shield gas flow rate during the steady welding period, a new characteristic curve is created, and the shield gas flow rate corresponding to the initial welding current and the shield gas flow rate corresponding to the final welding current are set to the new flow rate. The welding apparatus according to claim 6, wherein the welding apparatus is determined based on a characteristic curve.
  8. 前記溶接機に前記第１の弁を設け、前記ガス供給源と前記溶接機との間に設けられており前記シールドガスの供給を制御するためのガス流量調整装置に前記第２の弁を設けた請求項１から７のいずれか１項に記載の溶接装置。 The first valve is provided in the welder, and the second valve is provided in a gas flow rate adjusting device provided between the gas supply source and the welder for controlling the supply of the shield gas. The welding apparatus according to any one of claims 1 to 7.
  9. 前記ガス流量調整装置を前記溶接機に取り付けた請求項８記載の溶接装置。 The welding apparatus according to claim 8, wherein the gas flow rate adjusting device is attached to the welding machine.
PCT/JP2012/004854 2011-10-05 2012-07-31 Welding device WO2013051178A1 (en)

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