WO2021059707A1 - コンタクトチップ - Google Patents

コンタクトチップ Download PDF

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Publication number
WO2021059707A1
WO2021059707A1 PCT/JP2020/028237 JP2020028237W WO2021059707A1 WO 2021059707 A1 WO2021059707 A1 WO 2021059707A1 JP 2020028237 W JP2020028237 W JP 2020028237W WO 2021059707 A1 WO2021059707 A1 WO 2021059707A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
insertion hole
contact tip
alloy
tip
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2020/028237
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
蕗澤　武夫
悦男 増岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shinkokiki Co Ltd
Original Assignee
Shinkokiki Co Ltd
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 Shinkokiki Co Ltd filed Critical Shinkokiki Co Ltd
Priority to JP2021548379A priority Critical patent/JPWO2021059707A1/ja
Publication of WO2021059707A1 publication Critical patent/WO2021059707A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B23K9/26—Accessories for electrodes, e.g. ignition tips

Definitions

  • the present invention relates to a welding contact tip that guides a welding wire through an insertion hole of the welding wire and supplies a welding current.
  • this type of welding contact tip has an insertion hole 52 formed in the center of the main body 51 for inserting a welding wire in the axial direction.
  • a welding wire is inserted through the insertion hole 52, and the welding wire is brought into contact with the inner wall surface of the insertion hole 52 to be sent out while supplying an electric current, and discharged between the tip of the welding wire and the metal plate to be welded. Welding is performed by this.
  • the conventional contact tip is made of a copper alloy having excellent conductivity.
  • the welding contact tip as described above is usually welded by supplying a welding current of 100 A to 300 A to the welding wire.
  • a welding current 100 A to 300 A to the welding wire.
  • the temperature rise of the contact tip causes softening of the copper alloy, which is the material, and friction due to the feeding of the welding wire. Therefore, the shape of the tip opening 53 of the insertion hole 52 is gradually worn and deformed, and the quality of the weld bead deteriorates. For this reason, the contact tip was usually replaced after about 8 hours of use.
  • the welding wire is fed and pulled in, that is, forward feed and reverse feed are repeated synchronously to generate a short-circuit state and an arc state for welding.
  • the tip opening 53 of the insertion hole 52 reciprocates and wears due to the forward and reverse feeding of the welding wire, so that the wear deformation of the tip opening 53 becomes remarkable. Therefore, there is a problem that the service life of the contact tip is remarkably shortened and the replacement interval is shortened.
  • the present invention solves the above-mentioned problems, and not only when the welding wire is forward-fed or reverse-fed for welding, but also when the welding current exceeds 300 A, the contact tip made of copper alloy can be used for 100 A to 300 A. It is an object of the present invention to provide a contact tip for welding which has a much longer life than the case where welding is performed with a welding current and can be operated unmanned in robot welding or the like.
  • the contact tip of the present invention made to solve the above problems is a contact tip in which an insertion hole for inserting a welding wire in the axial direction is formed in the center of the main body to guide the welding wire and supply a welding current.
  • the present invention is characterized in that at least the portion forming the tip opening of the insertion hole is formed of a molybdenum alloy.
  • the entire body can be formed of molybdenum alloy.
  • the main body is separately formed into a front housing and a rear adapter, and the front housing can be formed of a molybdenum alloy.
  • the main body includes a pipe-shaped core member forming an insertion hole, and this core member can be formed of a molybdenum alloy.
  • the molybdenum alloy is a TZM alloy (titanium / zirconium / molybdenum alloy).
  • the member forming the tip opening of the insertion hole through which the welding wire is inserted is made of molybdenum alloy. Even if it is used for bals welding exceeding 300A, it has a much longer life than when welding with a welding current of 100A to 300A with a contact tip made of copper alloy, and unmanned operation is possible in robot welding etc. Will be. In particular, by using a TZM alloy, the effect is remarkably improved.
  • FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, in which the main body 1 of the contact tip includes a front housing 2 and a rear adapter 3 detachably coupled to the housing 2.
  • the housing 2 is made of a molybdenum alloy and is formed in a tapered shape from the cylindrical portion at the base end toward the tip.
  • the rear adapter 3 is made of copper or a copper alloy as before.
  • the housing 2 is made of a TZM alloy (titanium / zirconium / molybdenum alloy) and the adapter 3 is made of zircochrome copper.
  • TZM alloy titanium / zirconium / molybdenum alloy
  • Molybdenum is a refractory metal and there are various alloys mainly composed of molybdenum.
  • TZM alloy is an alloy having a high melting point, high strength, excellent corrosion resistance, and shape stability. The molybdenum alloy becomes brittle when it reaches the recrystallization temperature, but the TZM alloy contains fine carbide particles and the recrystallization temperature is raised to 1300 ° C. or higher, so that it is an alloy suitable for furnace materials and other heat-resistant applications.
  • Typical compositions of TZM alloys are titanium: 0.25 to 1.0%, zirconium: 0.04 to 2.0%, carbon: 0.01 to 0.04%, the balance being molybdenum and unavoidable impurities. is there.
  • Zircochrome copper is an alloy of chromium, zirconium, and copper having excellent strength and conductivity, and commercially available materials can be used.
  • a first insertion hole 4 having a hole diameter corresponding to the wire diameter of the welding wire to be inserted is formed in the housing 2 in the axial direction of the central portion, and is communicated with the first insertion hole 4 at the rear portion and screwed on the inner peripheral wall.
  • a large-diameter fitting hole 5 in which the portion is screwed is formed.
  • the adapter 3 has a protrusion 6 formed at the tip thereof to be fitted into the fitting hole 5 of the housing 2, and a screw portion screwed into the screw portion of the fitting hole 5 is screwed on the outer peripheral surface of the protrusion 6.
  • the central portion of the protrusion 6 has a cylindrical shape having substantially the same diameter as the shape of the base end of the housing 2, and the second insertion hole 7 having the same diameter as the first insertion hole 4 is provided in the axial direction of the central portion. It is formed.
  • a mounting portion 8 is formed in which a screw portion for mounting a contact tip by screwing into a torch (not shown) is threaded.
  • a second insertion hole 7 having the same diameter as the first insertion hole 4 of the housing 2 is formed in the axial direction of the central portion of the adapter 3.
  • the contact tip of this embodiment is for a welding wire having a diameter of 1.2 mm, and the hole diameters of the first insertion hole 4 and the second insertion hole 7 are 1.3 mm. In the case of a welding wire having a diameter of 1.4 mm, the hole diameters of the first insertion hole 4 and the second insertion hole 7 are 1.6 mm.
  • the first insertion hole 4 of the housing 2 and the second insertion hole 4 of the adapter 3 are combined.
  • the insertion holes 7 communicate with each other to form the insertion holes 9 for the welding wire.
  • the tip opening 9a of the insertion hole 9 is also formed with respect to the TZM alloy.
  • the contact tip of the present invention and the conventional contact tip were used for welding the steel frame for welding, and the service life was compared.
  • Welding conditions are welding current: 370A, shield gas: mixed gas of 80% argon and 20% carbon dioxide gas, pulse mug welding, welding wire: copper plating wire with a diameter of 1.4 mm (manufactured by Nippon Steel Welding & Co., Ltd., product number YM- AG), welding speed: 180 mm / min.
  • the contact tip of the present embodiment was capable of forming a welding length of 192 m ⁇ 8 layers with one contact tip, and had a service life of 153 hours / piece.
  • a conventional contact tip made of zircochrome copper can perform 2 m ⁇ 8 layers, and has a service life of 1.6 hours.
  • the service life of the contact tip of the present embodiment is 96 times that of the conventional contact tip, and the unmanned operation of welding can be carried out.
  • the contact tip of the present invention and the conventional contact tip were used for welding the general structural rolling agent (SS material), and the service lives were compared.
  • Welding conditions are welding current: 180-320A, shield gas: mixed gas of 80% argon and 20% carbon dioxide, pulse mug welding, welding wire: copper plated wire with a diameter of 1.2 mm (HUNDAI WELDING), Product number SM-70), welding speed: 250 mm / min, welding time 120 minutes, usage rate: about 70%.
  • the usage rate refers to the ratio of the energizing time in one cycle consisting of the energizing time and the resting time, and one cycle was set to 10 minutes. It includes weaving welding 3.2m / 20min and swing width 30mm, which proceeds while swinging the torch to the left and right with respect to the welding line.
  • one contact tip of this embodiment had a welding length of 1,378 m and a welding time of 96 hours.
  • the hole diameter of the tip opening of the insertion hole one month later was 1.38 mm, which was only increased by 0.08 mm from 1.3 mm at the start of welding, and could be used as it was thereafter.
  • the contact tip made of chrome copper (CuCr) had to be replaced with a welding length of 30 m and a welding time of 2.0 hours.
  • the service life of the contact tip of the present embodiment is 48 times or more that of the conventional contact tip, and the unmanned operation of welding can be carried out.
  • the contact tip of this embodiment withstood a welding length of 2,413 m and a welding time of 160 hours without tip replacement, and the service life was 80 times longer than before. The final evaluation was obtained.
  • FIG. 2 is a cross-sectional view showing a second embodiment of the present invention.
  • the main body 10 has a cylindrical shape from the base end to the central portion, and is tapered toward the tip end, and an insertion hole 11 for a welding wire is formed in the axial direction of the central portion. That is, unlike the first embodiment, it does not have a divided structure, but the whole is integrally formed, and the whole is made of a TZM alloy. Also in the second embodiment, the tip opening 11a of the insertion hole 12 is formed of a TZM alloy.
  • FIG. 3 is a cross-sectional view showing a third embodiment of the present invention.
  • the main body 12 has a cylindrical shape from the base end to the central portion, is tapered toward the tip end, and has a through hole 13 formed in the axial direction of the central portion.
  • the main body 12 is made of zirconium copper.
  • the core member 14 is fitted and fixed inside the through hole 13.
  • the core member 14 has a pipe shape, and the inside thereof is an insertion hole 15 for a welding wire.
  • the outer diameter of the core member 14 is substantially the same as the inner diameter of the through hole 13 of the main body 12, and the tip opening 15a thereof is at the same position as the tip 16 of the core member 14.
  • the core member 14 is made of a TZM alloy.
  • the portion forming the tip opening of the insertion hole through which the welding wire is inserted in the axial direction is formed of a molybdenum alloy.
  • Molybdenum alloys have higher altitude, melting point, and recrystallization temperature than copper alloys, and TZM alloys are particularly excellent in these characteristics. For this reason, it is difficult to soften even when the temperature rises, and the service life becomes extremely long not only when the welding wire is forward or reverse, but also when the welding current is high, resulting in unmanned operation. It is possible.
  • the TZM alloy has an extremely small magnetic permeability as compared with the conventional chromium copper, the adhesive force of sputtering is weak and the peelability is excellent.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
PCT/JP2020/028237 2019-09-26 2020-07-21 コンタクトチップ Ceased WO2021059707A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021548379A JPWO2021059707A1 (https=) 2019-09-26 2020-07-21

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2019188981 2019-09-26
JP2019-188981 2019-09-26
JP2020-024729 2020-01-29
JP2020024729 2020-01-29

Publications (1)

Publication Number Publication Date
WO2021059707A1 true WO2021059707A1 (ja) 2021-04-01

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PCT/JP2020/028237 Ceased WO2021059707A1 (ja) 2019-09-26 2020-07-21 コンタクトチップ

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WO (1) WO2021059707A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114559137A (zh) * 2022-03-30 2022-05-31 厦门航天思尔特机器人系统股份公司 一种机器人自动更换导电嘴的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS505869Y1 (https=) * 1968-12-26 1975-02-19
JPS63199843A (ja) * 1987-02-13 1988-08-18 Natl Res Inst For Metals モリブデンまたはその合金とジルコニアの複合成形体およびその製造法
JPS6415674U (https=) * 1987-07-13 1989-01-26
JPH06650A (ja) * 1992-06-23 1994-01-11 Kobe Steel Ltd コンタクトチップ及びその製造方法
JP2013150993A (ja) * 2012-01-24 2013-08-08 Panasonic Corp 溶接用チップ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS505869Y1 (https=) * 1968-12-26 1975-02-19
JPS63199843A (ja) * 1987-02-13 1988-08-18 Natl Res Inst For Metals モリブデンまたはその合金とジルコニアの複合成形体およびその製造法
JPS6415674U (https=) * 1987-07-13 1989-01-26
JPH06650A (ja) * 1992-06-23 1994-01-11 Kobe Steel Ltd コンタクトチップ及びその製造方法
JP2013150993A (ja) * 2012-01-24 2013-08-08 Panasonic Corp 溶接用チップ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114559137A (zh) * 2022-03-30 2022-05-31 厦门航天思尔特机器人系统股份公司 一种机器人自动更换导电嘴的方法
CN114559137B (zh) * 2022-03-30 2024-02-09 厦门航天思尔特机器人系统股份公司 一种机器人自动更换导电嘴的方法

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Publication number Publication date
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