WO2008099992A1 - Machine à souder à la molette automatique avec onduleur c.c. pour le soudage d'acier invar sur un méthanier - Google Patents

Machine à souder à la molette automatique avec onduleur c.c. pour le soudage d'acier invar sur un méthanier Download PDF

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Publication number
WO2008099992A1
WO2008099992A1 PCT/KR2007/002860 KR2007002860W WO2008099992A1 WO 2008099992 A1 WO2008099992 A1 WO 2008099992A1 KR 2007002860 W KR2007002860 W KR 2007002860W WO 2008099992 A1 WO2008099992 A1 WO 2008099992A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
power supply
resistance seam
automatic resistance
current power
Prior art date
Application number
PCT/KR2007/002860
Other languages
English (en)
Inventor
Kum-Gi Park
Woo-Jeong Choi
Jong-Soo Yang
Hun-Sung Yoon
Original Assignee
Stx Shipbuilding 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 Stx Shipbuilding Co., Ltd. filed Critical Stx Shipbuilding Co., Ltd.
Publication of WO2008099992A1 publication Critical patent/WO2008099992A1/fr

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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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
    • B23K11/061—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams
    • 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
    • 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/241—Electric supplies
    • 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/02—Carriages for supporting the welding or cutting element
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys

Definitions

  • the present invention relates to an automatic resistance seam welding machine for welding of a membrane attached inside a cargo tank of an LNG carrier, and belongs to a ship and machinery technology field.
  • FIG. 1 is a partial perspective view illustrating the cargo tank of the LNG carrier
  • FIG. 2 is a sectional view illustrating the cargo tank of the LNG carrier.
  • the LNG cargo tank 1 has shape of octahedron among polyhedrons, and is located in parallel to a length direction of the carrier.
  • a second insulating box is installed on an inner wall of a double ship body of the LNG cargo tank, and a second membrane is installed on the second insulating box.
  • a first insulating box is installed on the second membrane, and a first membrane is installed on the first insulating box and contacted with natural gas liquefied to ultralow temperature(-163 ° C).
  • FIG. 3 is a perspective view illustrating the insulating box 9 and an INVAR steel strake 2.
  • An INVAR steel tongue 10 with "i-" shape is installed to a groove of the insulating box 9.
  • the INVAR steel strake 2 with " ⁇ ” shape is installed between the INVAR steel tongues 10, and thus the membrane is formed.
  • a roof 3 and a side 4, longitudinal/transverse walls 5, 8 and upper/lower inclination walls 6, 7 as shown in FIGs 1 and 2 are formed in the membrane.
  • a controller mounted inside a transformer and a moving control vehicle with a welding power supply uses a silicon-controlled rectifier(SCR) for control of a phase angle of a single phase alternating current power supply.
  • SCR silicon-controlled rectifier
  • an object of the present invention is to provide the automatic resistance seam welding machine by DC INVERT for the INVAR steel welding at the LNG carrier to improve welding quality as well as work efficiency and productivity by using an inverted direct current power supply instead of the single phase alternating current power supply and providing optimal welding conditions to a thin plate connecting portion of the membrane.
  • an automatic resistance seam welding machine by DC INVERT for INVAR steel welding at an LNG carrier driven by an inverted direct current power supply transformed by an inverter transformer which comprises: a welding vehicle 14 mounting an electrode wheel 17, a driving roller 18, an air motor 13, an inverter transformer 16, an air cylinder 15 and welding a welded portion; a moving control vehicle 12 with a welding power supply mounting a controller(not shown) , a water cooling device(not shown), a welding power supplyCnot shown), and controlling welding conditions of the welding vehicle; a power supply line 19, an air hose 20; and a cooling hose 21.
  • welding quality as well as work efficiency and productivity are improved by using the inverted direct current power supply instead of a single phase alternating current power supply and providing optimal welding conditions.
  • FIG. 1 is a partial perspective view illustrating a cargo tank, of an
  • FIG. 2 is a sectional view illustrating structure of the cargo tank of the LNG carrier; ⁇ 14> FIG. 3 is a perspective view illustrating an insulating box and an
  • FIG. 4 is a view illustrating composition of an automatic resistance seam welding machine according to the present invention
  • FIG. 5 is a view magnifying one portion of FIG. 3
  • FIG. 6 is a view defining nugget and nugget pitch in automatic resistance seam welding
  • FIG. 7 is a view showing a permission standard and definition of the permission standard of a transverse section according to welding quality regulations of technologists for a tank of the LNG carrier
  • FIG. 8 is a view illustrating arc monitoring waveform of real-time welding conditions of welding nugget welded by a conventional automatic resistance seam welding machine with a single phase alternating current power supply; ⁇ 20> FIG.
  • FIG. 9 is a view illustrating composition of a welding device of the automatic resistance seam welding machine with an inverted direct current power supply according to the present invention.
  • FIG. 10 is a view illustrating the arc monitoring waveform of the real- time welding conditions of the welding nugget welded by the automatic resistance seam welding machine with the inverted direct current power supply according to the present invention;
  • FIG. 11 is a view illustrating another exemplary embodiment of the present invention.
  • FIG. 12 is a graph illustrating a ratio of a maximum current/an average current according to an electric current region in the same set current conditions of the automatic resistance seam welding by the single phase alternating current power supply and the inverted direct current power supply.
  • FIG. 13 is a graph illustrating a heat quantity ratio of the maximum current/the average current according to the electric current region in the same set current conditions of the automatic resistance seam welding by the single phase alternating current power supply and the inverted direct current power supply.
  • a conventional automatic resistance seam welding machine performs welding by using a single phase alternating current power supply.
  • an automatic resistance seam welding machine according to the present invention is characterized in performing welding by using an inverted direct current power supply, and will be explained in detail.
  • FIG. 4 is a view illustrating composition of the automatic resistance seam welding machine according to the present invention, and the automatic resistance seam welding machine according to the present invention comprises an welding vehicle mounting an electrode wheel 17, a driving roller 18, an air motor 13, an inverter transformer 16, and an air cylinder 15; a moving control vehicle 12 with a welding power supply mounting a controller(not shown), a water cooling device(not shown), the welding power supply(not shown) and others", a power supply line 19; an air hose 20; and a cooling hose 21.
  • the electrode wheel 17 receives the inverted direct current power supply from the inverter transformer 16, and allows an electric current to flow into mother material directly.
  • the air cylinder 15 allows good quality of welding by compressing the electrode wheel 17.
  • the driving roller 18 allows the welding vehicle 14 to search for the welding portion, and the air motor 13 drives the welding vehicle 14 in an constant speed by using compressed air.
  • the inverter transformer 16 transforms the single phase alternating current power supply received from the welding power supply(not shown) into the inverted direct current power supply.
  • the controller(not shown), the water cooling device(not shown) and the welding power supply(not shown) are mounted in the moving control vehicle 12 with the welding power supply, and control welding conditions of the welding vehicle 14.
  • the controller(not shown) controls the water cooling device(not shown), the welding power sup ⁇ ly(not shown), the welding power supply(not shown) and others.
  • the water cooling device(not shown) cools the electrode wheel 17, the inverter transformer 16, a driving form panel(not shown) and others.
  • FIG. 5 is a view magnifying one portion of FIG. 3, and shows welding beads 22 and the electrode wheel 17 generated in case of welding by the automatic resistance seam welding machine, while an INVAR steel tongue is installed in the middle and two INVAR steel strakes are installed on the side.
  • FIG. 6 is a view defining nugget and nugget pitch in automatic resistance seam welding
  • FIG. 7 is a view showing a permission standard and definition of the permission standard of a transverse section according to welding quality regulations of technologists for a tank of the LNG carrier.
  • Lt is maximum width of the nugget
  • La neck thickness
  • e height of the nugget
  • t is thickness in case of subtracting concave mark depth from welded material thickness.
  • FIG. 8 is a view illustrating arc monitoring waveform of real-time welding conditions of welding nugget welded by the conventional automatic resistance seam welding machine with the single phase alternating current power supply, illustrates 5 nuggets, and shows that one nugget is generated for two cycles and standstill time.
  • Waveform 23 shows a half periodd period) of a forward direction of nugget 1
  • waveform 24 shows the half periodCl period) of a reverse direction of the nugget 1
  • waveform 25 shows a half period(2 period) of the forward direction of the nugget 1
  • waveform 25 shows the half period(2 period) of the reverse direction of the nugget 1.
  • the maximum current which has a 140% level of an RMS current(Root Mean Square current) for generating the nugget, is applied to the electrode wheel 17 and the welding portion.
  • the automatic resistance seam welding machine with the single phase alternating current power supply can control ignition timing and size of a welding current by using a thyrister(not shown) and controlling an ignition phase angle like current waveform of FIG. 8.
  • the electric current and voltage of the single phase alternating current power supply are commercial 60Hz. Since a period for generating one nugget is 3Hz, 20 nuggets per second can be generated. Accordingly, since the nugget pitch of FIG. 6 is increased according to increase of welding speed, average La length becomes shorter and dispersion of La length is increased, thereby increasing a defective ratio.
  • the automatic resistance seam welding machine with the single phase alternating current power supply according to the present invention sets and controls a welding period by allowing current and voltage time to be in an 1 msec(rai 1 lisecond) unit by control of a control circuit 33, a driving circuit 32 and IGBT 31.
  • the automatic resistance seam welding machine with the single phase alternating current power supply according to the present invention can maintain the nugget pitch as well as the average La length and La length dispersion uniformly in spite of increasing welding speed by controlling current application time and standstill time and welding, thereby allowing defective welding to be prevented.
  • FIG. 9 is a view illustrating composition of the welding machine and a control device of the automatic resistance transform welding machine with the inverted direct current power supply according to the present invention.
  • a diode input terminal with three phase bridges as a rectifying circuit 28 is coupled to a commercial three-phase alternating current power supply 27.
  • a direct current applied from an output terminal of the rectifying circuit 28 is smoothed in a smoothing circuit consisting of a coil 29 and a condenser 30, and then inputted to a switching element of IGBT 31.
  • the IGBT 31 direct current is changed to a high frequency alternating current with rectangular waveform by high frequency switching operation. Pulse width of the IGBT 31 is controlled by a control circuit 33 through a driving circuit 32.
  • the high frequency alternating current outputted from the IGBT 31 is changed to a set-down high frequency alternating current through first and second coils of a transformer 34.
  • the high frequency alternating current is changed to the direct current by the rectifying circuit 35 consisting of diodes, and a second electric current is supplied to welded material 37 through the electrode wheel 17.
  • the automatic resistance seam welding machine with the inverted direct current power supply performs feedback of the welding current and allows the welding current to be flown with uniform size for stable resistance seam welding.
  • a welding current is a very high current with several thousand to several ten thousand Ampere
  • the current is detected by using an air-core coil or a Hall sensor. Accordingly, base drive pulse width of the IGBT 31 is controlled so as to allow an uniform welding current at all times.
  • the Hall sensor 38, a secondary current measurement/conversion circuit 39, the control circuit 33 and the drive circuit 32 form a static current control circuit with a PWM(Pulse Width Modulation) method by feedback control for allowing a secondary current of the automatic resistance seam welding machine to be nearly same to a predetermined current value.
  • FIG. 10 is a view illustrating the arc monitoring waveform of the real ⁇ time welding conditions of the welding nugget welded by the automatic resistance seam welding machine with the inverted direct current power supply according to the present invention, illustrates 5 nuggets, and shows that one nugget per one welding period is generated.
  • the maximum current has an almost same current value as the RMS current(Root Mean Square current) for generating the nugget. Since current application time and standstill time per one period are controlled in 1 msec(millisecond), the current application time and the standstill time can be set and welded in a predetermined ratio such as 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1 and others.
  • the automatic resistance seam welding machine with the inverted direct current power supply according to the present invention can set one period to have 10 to 50msec(millisecond) and weld.
  • the one period is set to have 25 to 50msec(millisecond) and welded, average La length of Figure 7 is longer and La length dispersion is fewer, thereby minimizing defective welding.
  • FIG. 11 is a view illustrating another exemplary embodiment of the present invention, and shows that two periods 40 and 41 and one standstill time are necessary for generating one nugget by the automatic resistance seam welding machine with the inverted direct current power supply.
  • the automatic resistance seam welding machine with the inverted direct current power supply according to the present invention can control generation of one nugget with severaKl to 5) periods and one standstill time.
  • FIG. 12 is a graph illustrating a ratio of a maximum current/an average current according to an electric current region in the same set current conditions of the automatic resistance seam welding by the single phase alternating current power supply and the inverted direct current power supply, and shows that the ratio of the maximum current/the average current of the single phase alternating current power supply is higher than that of the inverted direct current power supply.
  • FIG. 13 is a graph illustrating a heat quantity, ratio of a maximum current/an average current according to the electric current region in the same set current conditions of the automatic resistance seam welding by the single phase alternating current power supply and the inverted direct current power supply, and shows the heat quantity ratio of the maximum current/the average current of the single phase alternating current power supply is higher than that of the inverted direct current power supply, and thus higher heat quantity causes life of the electrode wheel to be shorted due to deterioration of the electrode wheel. Accordingly, the automatic resistance seam welding with the inverted direct current power supply can allow the electrode wheel to be used longer than the automatic resistance seam welding with the single phase alternating current power supply, and maximize productivity because it is not necessary to repair or change the electrode frequently. [Industrial Applicability]
  • the automatic resistance seam welding machine for the INVAR steel welding at the LNG carrier can improve welding quality as well as work efficiency and productivity by using the inverted direct current power supply instead of the single phase alternating current power supply and providing the optimal welding conditions to the thin plate connecting portion of the membrane.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Inverter Devices (AREA)
  • Resistance Welding (AREA)

Abstract

L'invention concerne une machine à souder à la molette automatique utilisée pour souder une membrane fixée à l'intérieur d'une citerne de charge d'un méthanier selon la présente invention. La machine à souder à la molette automatique pour le soudage d'acier invar sur le méthanier peut améliorer la qualité de soudage ainsi que l'efficacité de travail et la productivité de par l'utilisation d'une alimentation en courant continu inversé à la place d'une alimentation en courant alternatif monophasé et de par l'obtention de conditions de soudage optimales pour une partie de liaison de plaque mince de la membrane.
PCT/KR2007/002860 2007-02-14 2007-06-13 Machine à souder à la molette automatique avec onduleur c.c. pour le soudage d'acier invar sur un méthanier WO2008099992A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0015166 2007-02-14
KR1020070015166A KR100785223B1 (ko) 2007-02-14 2007-02-14 Ｌｎｇ 운반선 인바강 용접을 위한 인버터직류전원자동저항심용접장치

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WO2008099992A1 true WO2008099992A1 (fr) 2008-08-21

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WO (1) WO2008099992A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104191080A (zh) * 2014-08-04 2014-12-10 合肥国声电子通信有限责任公司 一种机器人中频电阻焊接控制柜
FR3087141A1 (fr) * 2018-10-16 2020-04-17 Gaztransport Et Technigaz Soudage d'une membrane etanche d'une cuve
FR3124753A1 (fr) * 2021-06-30 2023-01-06 Gaztransport Et Technigaz Machine de soudage
FR3127423A1 (fr) * 2021-09-30 2023-03-31 Gaztransport Et Technigaz Machine de soudage à arrêt automatisé.
WO2024069115A1 (fr) * 2022-09-30 2024-04-04 Gaztransport Et Technigaz Machine de soudage à faisceau laser

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101316261B1 (ko) 2012-04-10 2013-10-10 주식회사 포스코 심 용접 방법 그리고 용접부를 가지는 강판
KR101308878B1 (ko) 2013-04-18 2013-09-23 이강천 3상 인버터 정류식 브레이징 저항 용접장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09108843A (ja) * 1995-10-24 1997-04-28 Daihatsu Motor Co Ltd タンクのシーム溶接方法
JPH1177326A (ja) * 1997-08-28 1999-03-23 Dengensha Mfg Co Ltd 抵抗シーム溶接方法とその溶接機
JP2000005879A (ja) * 1998-06-24 2000-01-11 Nippon Steel Corp 抵抗シーム溶接方法および装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09108843A (ja) * 1995-10-24 1997-04-28 Daihatsu Motor Co Ltd タンクのシーム溶接方法
JPH1177326A (ja) * 1997-08-28 1999-03-23 Dengensha Mfg Co Ltd 抵抗シーム溶接方法とその溶接機
JP2000005879A (ja) * 1998-06-24 2000-01-11 Nippon Steel Corp 抵抗シーム溶接方法および装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104191080A (zh) * 2014-08-04 2014-12-10 合肥国声电子通信有限责任公司 一种机器人中频电阻焊接控制柜
FR3087141A1 (fr) * 2018-10-16 2020-04-17 Gaztransport Et Technigaz Soudage d'une membrane etanche d'une cuve
WO2020079347A1 (fr) * 2018-10-16 2020-04-23 Gaztransport Et Technigaz Soudage d'une membrane etanche d'une cuve
CN112930240A (zh) * 2018-10-16 2021-06-08 气体运输技术公司 用于焊接罐的流体密闭膜的方法
CN112930240B (zh) * 2018-10-16 2022-11-08 气体运输技术公司 用于焊接罐的流体密闭膜的方法
FR3124753A1 (fr) * 2021-06-30 2023-01-06 Gaztransport Et Technigaz Machine de soudage
FR3127423A1 (fr) * 2021-09-30 2023-03-31 Gaztransport Et Technigaz Machine de soudage à arrêt automatisé.
WO2024069115A1 (fr) * 2022-09-30 2024-04-04 Gaztransport Et Technigaz Machine de soudage à faisceau laser
FR3140292A1 (fr) * 2022-09-30 2024-04-05 Gaztransport Et Technigaz Machine de soudage à faisceau laser

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