WO2010018778A1 - Chalumeau de soudage à l’arc - Google Patents

Chalumeau de soudage à l’arc Download PDF

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Publication number
WO2010018778A1
WO2010018778A1 PCT/JP2009/063923 JP2009063923W WO2010018778A1 WO 2010018778 A1 WO2010018778 A1 WO 2010018778A1 JP 2009063923 W JP2009063923 W JP 2009063923W WO 2010018778 A1 WO2010018778 A1 WO 2010018778A1
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WO
WIPO (PCT)
Prior art keywords
torch
arc
arc welding
welding
electrode
Prior art date
Application number
PCT/JP2009/063923
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English (en)
Japanese (ja)
Inventor
伊香賀定
戸田雅規
Original Assignee
ミヤチテクノス株式会社
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.)
Filing date
Publication date
Application filed by ミヤチテクノス株式会社 filed Critical ミヤチテクノス株式会社
Priority to JP2010524713A priority Critical patent/JPWO2010018778A1/ja
Priority to CN200980131477.0A priority patent/CN102123815B/zh
Publication of WO2010018778A1 publication Critical patent/WO2010018778A1/fr

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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
    • B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
    • 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
    • B23K9/24—Features related to electrodes
    • B23K9/28—Supporting devices for electrodes
    • B23K9/29—Supporting devices adapted for making use of shielding means
    • B23K9/291—Supporting devices adapted for making use of shielding means the shielding means being a gas
    • B23K9/296—Supporting devices adapted for making use of shielding means the shielding means being a gas using non-consumable electrodes

Definitions

  • the present invention relates to an arc welding torch capable of preventing misfire as much as possible at the start of arc welding, and particularly preferably to an arc welding torch used for TIG welding.
  • TIG welding is a method in which an arc is generated between an object to be welded and an electrode made of tungsten, and welding is performed with the heat.
  • a shielding gas composed of argon is injected at the time of welding to block the atmosphere and prevent discoloration oxidation of the workpiece.
  • Japanese Utility Model Publication No. 58-76388 discloses a technical idea of forming a ceramic layer on the inner peripheral surface of the tip of the torch nozzle in order to prevent spatter from being deposited on the tip of the torch nozzle during arc welding.
  • JP 2003-290930 A discloses a fiber material having insulation and heat resistance around a shield gas outlet in order to avoid deterioration in welding quality due to blow holes or the like. A technical idea of providing such a filter is disclosed.
  • a guide member is provided at the tip of the plasma nozzle. The technical idea of avoiding attachment and contact between the plasma nozzle and the member to be welded is disclosed.
  • the present invention has been made to solve the above-described problems, and prevents misfire as much as possible at the time of arc welding, can continuously generate an arc with a simple structure, and as a whole welding apparatus.
  • An object of the present invention is to provide an arc welding torch capable of reducing the manufacturing cost.
  • an arc welding torch includes a torch body, an electrode provided at an axial center portion of the torch body, a collet holding the electrode, and a collet surrounding the collet. It has a body and a torch nozzle provided at the tip of the torch body and through which the electrode is inserted, and a conductive member is mounted on the inner peripheral surface of the torch nozzle.
  • the conductive member may surround the electrode.
  • the conductive member can be stably attached. An effect is obtained.
  • the conductive member may be a metal mesh or a metal plate.
  • the metal plate includes one having a plate thickness of less than 0.1 mm.
  • the metal mesh and the metal plate may be made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy.
  • arc welding torch of the present invention when used for TIG welding, arc misfire is suppressed, which is more preferable.
  • FIG. 4 is a block diagram of a main part of an experimental apparatus according to Example 2.
  • Example 6 is a graph showing changes of arc current with respect to time in Example 2. Experimental results showing the number of discharges and the presence or absence of misfire when arc discharge is repeatedly performed using an arc welding torch equipped with a conductive member, and arc discharge using an arc welding torch without a conductive member It is an experimental result which shows the frequency
  • the welding torch 10 has a torch body 16, and the torch body 16 has an electrode 18 provided at the center of the shaft and a collet 20.
  • the collet 20 is surrounded by a collet body 22, and the collet body 22 is screwed with a torch nozzle 24.
  • the electrode 18 is gripped by the collet 20, and its tip is slightly exposed to the outside from the torch nozzle 24 as will be described later.
  • the collet body 22 is formed with a plurality of gas outlet holes 28 for leading shield gas (argon gas in the present embodiment) to the space 26 formed between the electrode 18 and the torch nozzle 24.
  • the torch nozzle 24 is preferably made of alumina.
  • the torch nozzle 24 has a large-diameter base side on the torch body 16 side, and is formed in a cylindrical shape with a narrow diameter through a gentle shoulder toward the tip side of the electrode 18, that is, the outer diameter of the tip part. The shape is narrowed down to narrow down.
  • the central portion of the tip of the torch nozzle 24 is formed as an opening 30 having the same diameter and extending a predetermined distance.
  • the electrode 18 is inserted into the opening 30 and the tip protrudes from the opening 30.
  • a conductive member 34 is mounted so as to surround the base end side of the electrode 18 so as to fit inside the shoulder portion where the torch nozzle 24 is gradually throttled. Is done.
  • the conductive member 34 may be attached to a position other than the shoulder portion on the inner peripheral surface 32 of the torch nozzle 24.
  • the diameter of the inner peripheral surface 32 on the rear end side of the electrode 18 from the shoulder portion (that is, the base portion side of the torch nozzle) may be mounted at a substantially constant position. In this way, the conductive member 34 can be easily attached as compared with the case where the torch nozzle 24 is attached to the shoulder portion where the diameter is gradually reduced.
  • the conductive member 34 is formed in a mesh shape and is made of any one metal of, for example, stainless steel (SUS), copper, copper alloy, aluminum, and aluminum alloy.
  • SUS stainless steel
  • copper alloy for example, brass can be used.
  • the conductive member 34 may be attached to the inner peripheral surface 32 of the torch nozzle 24 using not only the frictional force generated between the conductive member 34 and the torch nozzle 24 but also an adhesive.
  • carbon dioxide, helium, or the like may be used as the shielding gas instead of argon gas.
  • the welding torch 10 according to the first embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect will be described.
  • the front L-shaped workpieces W 1 and W 2 are arranged back to back at a predetermined position, and a welding torch 10 is attached to a welding site 42 where the workpieces W 1 and W 2 are in contact with each other.
  • the electrodes 18 are moved closer to each other by a predetermined distance. Preferably this distance is 5 mm.
  • the welding torch 10 does not misfire even if the TIG welding operation is continuously performed, and the arc forming space 44 is surely formed, and the TIG welding operation is continuously performed by obtaining a good shielding state from the atmosphere. can do.
  • the reason can be considered as follows. That is, in the prior art, an arc is generated from the tip of the electrode at the start of welding, but there is a phenomenon that the arc generation position rises from the tip of the electrode as the number of weldings is repeated. This is considered to be due to the influence of electrode oxidation and the like. The fact that the arc generation position climbs up from the tip of the electrode means that the arc generation position moves away from the workpiece. In other words, as the distance from the workpiece to the arc generation position becomes longer, the initial arc voltage gradually becomes higher and misfires occur frequently.
  • ionization means that electrons are ejected from an atom when an energy larger than the excited state is applied to the atom from the outside, and the minimum voltage required for this ionization is called “ionization voltage”. In order to generate plasma, energy higher than the ionization voltage must be applied.
  • Raising the ionization voltage means that the frequency of misfires is high on the premise that there is a situation where it is difficult to generate plasma.
  • the electrode is oxidized and gradually misfires are generated. It becomes easy to do.
  • the initial arc voltage is gradually increased, and the arc formation space 44 is formed again. If the misfire is repeated, the initial arc voltage will eventually become misfired even if the maximum voltage allowed by the high voltage generation circuit is applied.
  • the TIG welding operation is interrupted and the work such as polishing of the electrode tip is performed. Is required.
  • the initial arc voltage can be reduced, the load on the welding torch 10 and the TIG welding machine incorporating it can be reduced. Therefore, it becomes difficult for the failure of the high voltage generation circuit to occur and the TIG welding operation is less interrupted, so that the production efficiency of arc welding is improved. In some cases, the high voltage generation circuit may not be incorporated into the TIG welder.
  • FIG. 3 is an initial arc voltage waveform diagram with respect to the presence or absence of the conductive member 34.
  • a solid line A shown in FIG. 3 shows an initial arc voltage waveform of the welding torch 10 in which the conductive member 34 made of a metal mesh is incorporated on the inner peripheral surface 32 of the torch nozzle 24 according to the present embodiment, and a broken line a These show the initial arc voltage waveform of the TIG welding apparatus not equipped with the conductive member 34.
  • the initial arc voltage is a minimum value of a voltage necessary for forming the arc forming space 44. Note that the voltage shown on the vertical axis in FIG. 3 increases in the negative direction.
  • the welding torch 10 incorporating the conductive member 34 can obtain an initial arc voltage around 6200 V, but does not include the conductive member 34. In the art welding torch, about 11500V is the initial arc voltage.
  • the conductive member 134 is formed in a plate shape (thin plate shape) or a foil shape.
  • the conductive member 134 is made of any one of SUS, copper, copper alloy, aluminum, and aluminum alloy. It is configured.
  • the copper alloy for example, brass can be used.
  • the thickness of the conductive member 134 is set to such a size that the shield gas can sufficiently flow through the torch nozzle 24. Further, the thickness of the conductive member 134 can be set to less than 0.1 mm.
  • the metal plate or the metal foil is used for the conductive member 134 of the welding torch 100, the same effects as those of the first embodiment are obtained.
  • the arc welding torch according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.
  • the conductive member may be formed in a coil spring shape.
  • the conductive member may be mounted on the torch nozzle by depositing or coating a metal such as aluminum on the inner peripheral surface of the torch nozzle.
  • a metal such as aluminum
  • the torch nozzle need not have a shape that facilitates mounting of the conductive member. Therefore, the design freedom of the torch nozzle increases.
  • Example 1 TIG welding was performed using an arc welding torch configured as in the first embodiment described above. That is, in this embodiment, a metal mesh is used for the conductive member.
  • a copper plate was selected as the work piece, and a tungsten electrode ( ⁇ 2.5 mm) containing 1.5% by weight of lanthanum was used as the electrode.
  • 6 liters per minute was flowed using argon gas as a shielding gas.
  • the argon gas pre-purge time was 2 seconds.
  • Two seconds after flowing argon gas a welding current of 100 A was passed through the electrode.
  • the time until the welding current started to flow through the electrode and ended was 100 milliseconds.
  • the subsequent argon gas post-purge time was 2 seconds. Incidentally, the welding tact time was once every 5 seconds.
  • the welding results are as follows. That is, the number of misfires was zero in welding for about 2 hours (1440 times). Also, the retry start operation set for the welding power source (the function to restart from the welding power source when a misfire occurs) never worked. This indicates that the arc welding torch is extremely effective against misfire.
  • the initial arc voltage can be kept low, so that a specific effect that the burden on the high voltage generation circuit is reduced and the life of the welding power source is increased can be obtained.
  • the experimental apparatus 200 of the present example includes a welding power source (PULSETIG power source MAW-300A DC high voltage start type: manufactured by Miyachi Technos) 202 and a welding power source connected to one terminal 204 of the welding power source 202.
  • a torch (TA-23SSP: manufactured by Miyachi Technos) 206, a gas supply unit 208 for supplying a shielding gas (argon gas) to the welding torch 206, and a work 212 made of tough pitch copper connected to the other terminal 210 of the welding power source 202. It has.
  • the welding torch 206 has basically the same configuration as the welding torch 10 of the first embodiment described above, a torch body 214, an electrode ( ⁇ 1.6 mm) 216 made of tungsten containing 1.5% by weight of thorium, and a torch nozzle. 218, a conductive member 220, and the like.
  • the electrode 216 is attached to the torch body 214 so that the tip polishing angle is set to 40 ° and the protruding length (L1) from the torch nozzle 218 is 2 mm.
  • the welding torch 206 is fixed by a support member (not shown) so that the distance (L2) between the surface of the workpiece 212 and the tip of the electrode 216 is 1 mm.
  • the welding torch 206 and the workpiece 212 are connected to the terminals 204 and 210 of the welding power source 202 so that the electrode 216 is a cathode and the workpiece 212 is an anode.
  • the welding current was controlled as shown in the graph in FIG. Specifically, the start current was set to 20 A, the upslope time was set to 20 milliseconds, the welding current was set to 30 A, and the welding time was set to 50 milliseconds. In this example, downslope control was not performed, and the welding tact time was once every 3 seconds. The flow rate of the shielding gas was 3 liters per minute.
  • the upper limit of the number of arc discharges was basically 1500 times per set. However, for the SUS mesh, the upper limit of the number of arc discharges was 2100 times for the third set (see FIG. 8).
  • Comparative example Next, a comparative example will be described.
  • the comparative example used the experimental apparatus 200 of the present example in which the conductive member 220 is omitted.
  • the experimental conditions and measurement method were the same as in this example.
  • Example 2 The experimental results of this example and the comparative example will be described with reference to FIG.
  • misfires occurred at 44 times, 36 times, and 61 times, respectively, whereas in Example 2, 1500 times except for the first set and the second set of aluminum foil. There was no misfire during that time.
  • about the 3rd set of SUS mesh 2100 times of continuous discharge was possible, and there was no misfire in the meantime.
  • the aluminum foil sometimes misfired at 902 times and 1302 times, but continuous discharge was performed at least 20 times as many times as the comparative example.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

L’invention concerne un chalumeau de soudage à l’arc (10) comprenant un corps de chalumeau (16), une électrode (18) agencée sur le centre axial du corps de chalumeau, une pince de serrage (20) destinée à maintenir l’électrode, un corps de pince de serrage (22) qui entoure le collet (20) et une buse de chalumeau (24) qui est agencée à l’extrémité avant du corps de chalumeau (16) et dans laquelle l’électrode est insérée. En outre, un élément conducteur (34) est fixé à la surface circonférentielle interne (32) de la buse de chalumeau (24). L’élément conducteur (34) est constitué d’un réseau métallique ou d’une plaque métallique.
PCT/JP2009/063923 2008-08-13 2009-08-06 Chalumeau de soudage à l’arc WO2010018778A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010524713A JPWO2010018778A1 (ja) 2008-08-13 2009-08-06 アーク溶接用トーチ
CN200980131477.0A CN102123815B (zh) 2008-08-13 2009-08-06 电弧焊接用焊枪

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-208675 2008-08-13
JP2008208675 2008-08-13

Publications (1)

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WO2010018778A1 true WO2010018778A1 (fr) 2010-02-18

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PCT/JP2009/063923 WO2010018778A1 (fr) 2008-08-13 2009-08-06 Chalumeau de soudage à l’arc

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JP (1) JPWO2010018778A1 (fr)
CN (1) CN102123815B (fr)
WO (1) WO2010018778A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015174141A (ja) * 2014-03-18 2015-10-05 川崎重工業株式会社 溶接トーチおよび全姿勢溶接装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61148475U (fr) * 1985-03-04 1986-09-12
JPS61217567A (ja) * 1985-03-20 1986-09-27 Toyota Motor Corp ア−ク溶接用コンタクトチツプのセラミツク被覆方法
JPS62155966U (fr) * 1986-03-20 1987-10-03
JPH0395173U (fr) * 1990-01-10 1991-09-27
JPH06285645A (ja) * 1993-04-05 1994-10-11 Mitsuba Kogyo Kk 溶接用コンタクトチップ
JP2001150139A (ja) * 1999-11-25 2001-06-05 Taihei:Kk アークスタッド溶接装置
JP2002059265A (ja) * 2000-05-29 2002-02-26 Daihen Corp 消耗電極ガスシールドアーク溶接用トーチ

Family Cites Families (6)

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CN2206176Y (zh) * 1994-07-30 1995-08-30 北京工业大学科技开发管理部 接触引弧用的氩弧焊自动焊炬
AT413668B (de) * 2003-05-13 2006-04-15 Fronius Int Gmbh Gasdüse für einen schweissbrenner und schweissbrenner mit einer derartigen gasdüse
JP4391835B2 (ja) * 2004-01-15 2009-12-24 株式会社ダイヘン コレットボディ及びティグ溶接トーチ
US6998574B2 (en) * 2004-03-29 2006-02-14 Linclon Global, Inc. Welding torch with plasma assist
CN1299872C (zh) * 2004-10-22 2007-02-14 哈尔滨工业大学 一种双钨极氩弧焊焊枪
AT504253B1 (de) * 2006-10-12 2008-06-15 Fronius Int Gmbh Einsatzelement, gaslinse mit einem solchen einsatzelement und schweissbrenner mit einer solchen gaslinse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61148475U (fr) * 1985-03-04 1986-09-12
JPS61217567A (ja) * 1985-03-20 1986-09-27 Toyota Motor Corp ア−ク溶接用コンタクトチツプのセラミツク被覆方法
JPS62155966U (fr) * 1986-03-20 1987-10-03
JPH0395173U (fr) * 1990-01-10 1991-09-27
JPH06285645A (ja) * 1993-04-05 1994-10-11 Mitsuba Kogyo Kk 溶接用コンタクトチップ
JP2001150139A (ja) * 1999-11-25 2001-06-05 Taihei:Kk アークスタッド溶接装置
JP2002059265A (ja) * 2000-05-29 2002-02-26 Daihen Corp 消耗電極ガスシールドアーク溶接用トーチ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015174141A (ja) * 2014-03-18 2015-10-05 川崎重工業株式会社 溶接トーチおよび全姿勢溶接装置

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JPWO2010018778A1 (ja) 2012-01-26
CN102123815A (zh) 2011-07-13
CN102123815B (zh) 2016-04-13

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