KR100737677B1 - Duplex nozzle injecting shield gas - Google Patents

Duplex nozzle injecting shield gas Download PDF

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Publication number
KR100737677B1
KR100737677B1 KR1020060044254A KR20060044254A KR100737677B1 KR 100737677 B1 KR100737677 B1 KR 100737677B1 KR 1020060044254 A KR1020060044254 A KR 1020060044254A KR 20060044254 A KR20060044254 A KR 20060044254A KR 100737677 B1 KR100737677 B1 KR 100737677B1
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South Korea
Prior art keywords
nozzle
gas
welding
injection
double
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KR1020060044254A
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Korean (ko)
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박종연
정하식
박인완
정창욱
최상구
김대주
이효재
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현대중공업 주식회사
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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
    • B23K9/32—Accessories
    • B23K9/325—Devices for supplying or evacuating 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
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/164—Arc welding or cutting making use of shielding gas making use of a moving fluid
    • 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
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
    • B23K9/295—Supporting devices adapted for making use of shielding means the shielding means being a gas using consumable electrode-wire

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

Abstract

A shield gas ejecting duplex nozzle device is provided to allow the welding beads to be uniformly formed by doubly ejecting a shield gas from a nozzle, thereby delaying the contact time of welding beads with air. A shield gas ejecting duplex nozzle device comprises: a duplex nozzle(200) including a nozzle inserting port(100) into which a welding nozzle inserted to fix the welding nozzle, ejection ports(20) formed on the bottom of both sides of the nozzle inserting port to eject a shield gas, and injection ports(23) for injecting the shield gas into the ejection ports; and a gas feeding part(300) for supplying gas into the injection ports of the duplex nozzle, wherein the duplex nozzle has a fine wire mesh(21) that is formed therein and covers the ejection ports to uniformly eject the gas, lids(22) installed on both ends thereof and opened or closed to exchange the fine wire mesh, and a fixing unit(12) that is installed at one side thereof and presses the nozzle inserted into the nozzle inserting port to fix the nozzle such that the gas is further ejected onto welding proceeded welding beads.

Description

이중 보호가스 분사 노즐{Duplex nozzle injecting shield gas}Duplex nozzle injecting shield gas

도 1 은 본 발명의 바람직한 실시예에 따른 예시도이고,1 is an exemplary view according to a preferred embodiment of the present invention,

도 2 는 본 발명에 따른 사용 예의 단면 예시도이다.2 is a cross-sectional view of a use example according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

(100): 노즐 삽입구 (10) : 노즐 돌출부 100: nozzle insertion hole 10: nozzle projection

(11) : 노즐 투입부 (12) : 고정수단(11): nozzle inlet 12: fixing means

(13) : 노즐 (14) : 용접 와이어 (13): nozzle 14: welding wire

(200): 이중노즐 (20) : 분사구 200: double nozzle 20: nozzle

(21) : 미세철망 (22) : 뚜껑 (21): fine wire mesh (22): lid

(23) : 주입구 (300): 가스 공급부23: injection hole 300: gas supply portion

(30) : Y관 (31) : 가스 주입관 30: Y pipe 31: gas injection pipe

(32) : 가스호스 (40) : 모재(32): gas hose (40): base material

(41) : 용접비드(41): welding beads

본 발명은 용접 로봇 토치에 부착되어 용융물이 공기와 접촉되어 산화되는 것을 방지하기 위한 이중 보호가스 분사 노즐에 관한 것으로, 보다 상세하게는 빠른 용접속도에 노즐에 분사되는 가스 외에 노즐 양측에 분사구를 더 설치하여 용접 노즐에서 분사되는 가스의 범위보다 더 큰 범위의 보호가스를 분사하여 용접비드 산화를 방지하여 연속 오버레이 용접이 가능하게 하는 이중 보호가스 분사 노즐을 제공함에 있다.The present invention relates to a double protective gas injection nozzle attached to the welding robot torch to prevent the melt from being oxidized in contact with the air, and more specifically, in addition to the gas injected to the nozzle at a high welding speed, injection nozzles are further provided on both sides of the nozzle. It is provided to provide a double protective gas injection nozzle to install a continuous overlay welding by preventing the welding bead oxidation by spraying a protective gas of a larger range than the gas injected from the welding nozzle.

특히 선박용 디젤엔진의 실린더 커버 인코넬 용접 로봇 시스템에서,Especially in cylinder cover inconel welding robot systems of marine diesel engines,

일반적으로 인코넬은 디젤엔진의 실린더 커버 중 연료분사 노즐이 위치하는 지점으로, 엔진 기동시 고온 고압의 조건이 발생하게 되므로, 상기 지점 부위에 내부식성, 고온강도가 높은 인코넬 합금을 오버레이하게 된다.Inconel is a point where the fuel injection nozzle is located in the cylinder cover of the diesel engine, and the conditions of high temperature and high pressure are generated when the engine is started, and the inconel alloy having high corrosion resistance and high temperature strength is overlaid on the point.

상기 오버레이는 모재에 약 1mm이상의 두께로 내마모, 내식, 내열성이 우수한 용접금속을 입히는 방법으로 기계부품은 마멸 충격, 침식에 의하여 마모되거나 환경의 영향으로 부식이 발생하여 많은 손실을 보게 되는데 이러한 손실을 감소시키기 위해 재료의 표면에 내마모 또는 내식재료를 입히는 용접이다.The overlay is a method of coating the base metal with a weld metal having excellent wear resistance, corrosion resistance, and heat resistance with a thickness of about 1 mm or more, and the mechanical parts are worn out by abrasion impact, erosion, or corrosion due to environmental effects. It is a welding of abrasion resistant or corrosion resistant material on the surface of the material in order to reduce it.

현재 실린더 커버 용접은 최소 150℃ 이상으로 예열된 원통형의 부재 속으로 용접작업자가 들어가 미그 용접장비를 이용해 반자동으로 작업을 하였다. 즉, 종래의 인코넬 용접은 약 200℃로 예열되고 작업공간이 협소한 실린더 커버 내부에서 용접작업을 실시하므로, 용접자세를 취하기가 어렵고, 작업여건이 열악하여 용접품질 및 생산성이 저하되는 문제점과, 최소예열온도(150℃)를 떨어뜨리지 않기 위해 최대 2시간 동안 연속작업을 하여야 하므로, 작업자의 피로도가 높고, 용접흄과 유해광선에 작업자가 직접 노출되며, 이로인해 안전사고의 발생우려가 높으며, 최종 표면에서의 철 함유량 규정 준수를 위한 멀티패스(Multi-pass) 작업시, 수작업으로 용접할 경우 용착 용접비드의 높이 제어가 불가능하게 되는 등 여러가지 문제점이 있었다.At present, the cylinder cover welding is carried out semi-automatically using the MIG welding equipment by the welding worker into the cylindrical member preheated to at least 150 ℃. That is, the conventional Inconel welding is preheated to about 200 ℃ and the welding work is carried out inside the narrow cylinder cover, it is difficult to take the welding posture, poor working conditions and poor welding quality and productivity, and In order not to drop the minimum preheating temperature (150 ℃), continuous work for up to 2 hours is required, which leads to high worker fatigue, direct exposure to welding fumes and harmful rays, and high risk of safety accidents. In the multi-pass operation for complying with the iron content on the surface, there were various problems such as the impossible to control the height of the weld weld bead when welding by hand.

이중 보호가스 분사 노즐은 상기와 같은 문제점을 해소하기 위해 개발된 선박용 디젤엔진 실린더 커버의 고온강도 및 내 부식성을 향상시키는 선박용 디젤엔진의 실린더 커버 인코넬 용접로봇 시스템에 설치되어 오버레이 용접비드 품질을 향상시켜 연속 용접작업이 가능하게 하는 장치이다.Double protection gas injection nozzle is installed in the cylinder cover inconel welding robot system of marine diesel engine to improve the high temperature strength and corrosion resistance of marine diesel engine cylinder cover developed to solve the above problems. It is a device that enables continuous welding work.

인코넬 합금 오버레이 용접시 나타나는 문제점으로 로봇에 의해 용접속도가 빠르기 때문에 용접부위가 완전히 응고되기 전에 공기와 접촉되기 때문에 용접비드 표면이 산화되어 산화막이 형성되고, 용접비드가 검게 변화되는 등의 문제가 있다. 특히 오버레이 용접은 최소 30패스 이상의 용접비드를 연속해서 용접하기 때문에 용접비드 표면의 산화막은 한번 발생하면 용접이 완료될 때까지 지속적으로 문제가 발생된다.Inconel alloy overlay welding is a problem caused by the welding speed is high by the robot because the welding area is in contact with the air before the solidification completely, there is a problem that the weld bead surface is oxidized to form an oxide film, the weld bead is changed black. . In particular, since overlay welding continuously welds at least 30 passes of weld beads, an oxide film on the surface of the weld bead is generated continuously until the welding is completed.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 창출된 것으로, 그 목적은 용접로봇의 빠른 용접속도로 인해 용접비드가 공기와 접촉되어 산화되는 것을 방지하기 위해 노즐에 보호가스가 이중으로 분사하여 공기와 접촉되는 시간을 지연하여 용접비드가 고르게 형성되게 하는 이중 보호가스 분사 노즐을 제공함에 있다.The present invention was created in order to solve the conventional problems as described above, the object is to prevent the welding bead contact with air due to the rapid welding speed of the welding robot to protect the gas by the double injection to the nozzle The present invention provides a dual protective gas injection nozzle which delays the time of contact with air to uniformly form the weld bead.

상기한 바와 같은 목적을 달성하고 종래의 결점을 제거하기 위한 과제를 수행하는 본 발명은 용접 노즐을 중심에 관통 삽입하여 고정하는 노즐 삽입구와, 상기 노즐 삽입구를 중심으로 양측 하단에 보호가스를 분사하는 분사구와, 상기 분사구에 보호가스를 주입하는 주입구,로 구성된 이중노즐과; 상기 이중노즐의 주입구로 가스를 공급하는 가스 공급부;로 구성되어 용접이 진행된 용접비드에 추가적으로 가스를 더 분사하는 것을 특징으로 한다.The present invention to achieve the object as described above and to perform the problem to remove the conventional defects is a nozzle insertion hole for inserting and fixing the welding nozzle in the center, and spraying the protective gas to the lower end on both sides around the nozzle insertion hole A double nozzle comprising an injection hole, an injection hole for injecting a protective gas into the injection hole; And a gas supply unit for supplying gas to the inlet of the double nozzle, further injecting gas into the welding bead in which the welding is performed.

이하, 본 발명의 바람직한 실시 예를 첨부된 도면과 연계하여 상세히 설명하면 다음과 같다. 본 발명을 설명함에 있어서, 관련된 공지기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그 상세한 설명은 생략한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

도 1 은 본 발명의 바람직한 실시예에 따른 예시도이고, 도 2 는 본 발명에 따른 사용 예의 단면 예시도이다.1 is an exemplary view according to a preferred embodiment of the present invention, Figure 2 is an exemplary cross-sectional view of the use example according to the present invention.

도 1 및 도 2 를 참조하면, 본 발명의 바람직한 실시 예에 따른 이중 보호가스 분사 노즐은 노즐(13)의 진행방향 전후로 소정길이로 구비되어 가스를 공급받아 분사하는 이중노즐(200)과, 상기 이중노즐(200) 중심에 관통되어 노즐(13)을 삽입할 수 있도록 가공된 노즐 삽입구(100)와, 상기 이중노즐(200)에 가스를 공급하는 가스 공급부(300)로 구성된 것을 특징으로 한다.1 and 2, the dual protective gas injection nozzle according to a preferred embodiment of the present invention is provided with a predetermined length before and after the traveling direction of the nozzle 13, the double nozzle 200 for supplying the gas and the injection, It is characterized by consisting of a nozzle insertion hole 100 which is penetrated through the center of the double nozzle 200 to insert the nozzle 13, and a gas supply unit 300 for supplying gas to the double nozzle (200).

상기 이중노즐(200)은 노즐 삽입구(100)를 중심으로 양측 하단에 구비되어 가스를 분출하는 한 쌍의 분사구(20)와, 상기 분사구(20)에 맞닿도록 이중노즐(200) 내부에 설치되어 상기 분사구(20)에 가스를 균일하게 분사하게 하는 미세철망(21)과, 상기 이중노즐(200) 좌우양단에 개폐되게 설치되어 상기 미세철망(21)을 교체할 수 있게 하는 뚜껑(22)과, 상기 이중노즐(200) 양측 상단에 구비되되 각 가스호스(32)와 결합되어 가스를 공급받는 주입구(23),로 구성된 것을 특징으로 한다.The double nozzle 200 is provided at both lower ends of the nozzle insertion hole 100 at a lower end of the pair, and is installed inside the double nozzle 200 so as to contact the injection hole 20. A fine wire mesh 21 for uniformly injecting gas into the injection hole 20, and a lid 22 installed to be opened and closed at both ends of the double nozzle 200 so as to replace the fine wire mesh 21. It is provided on both sides of the double nozzle 200, coupled to each gas hose 32, the injection port 23 is supplied with a gas, characterized in that consisting of.

상기 이중노즐(200) 중심을 관통하여 구비된 상기 노즐 삽입구(100)는 이중노즐(200) 상부에 노즐(13)을 투입하는 노즐 투입부(11)와, 이중노즐(200) 하부에 용접 와이어(14)가 돌출되어 용접하게 하는 노즐 돌출부(10)로 구성되어있다.The nozzle insertion hole 100 provided through the center of the double nozzle 200 has a nozzle inlet part 11 for injecting the nozzle 13 into the upper part of the double nozzle 200, and a welding wire under the double nozzle 200. It consists of the nozzle protrusion 10 which protrudes and welds (14).

상기 이중노즐(200) 중심 일측에 구비되어 상기 노즐 삽입구(100)에 노즐(13)이 삽입되면 움직이지 않도록 볼트와 같은 고정수단(12)으로 고정한다.The double nozzle 200 is provided at one side of the center and is fixed to the fixing means 12 such as a bolt so as not to move when the nozzle 13 is inserted into the nozzle insertion hole 100.

상기 가스 공급부(300)는 가스가 주입되는 가스 주입관(31)와, 상기 가스 주입관(31)에 결합되어 상기 가스 주입관(31)에서 공급받은 가스를 두 갈래로 나누어 주는 Y관(30)과, 일측이 상기 Y관(30)에 각 결합되고 타측이 상기 각 주입구(23)로 결합되어 공급받은 가스를 이송해주는 가스호스(32)로 구성된다.The gas supply unit 300 is coupled to the gas injection tube 31 and the gas injection tube 31 into which the gas is injected, the Y pipe 30 which divides the gas supplied from the gas injection tube 31 into two branches. And, one side is coupled to each of the Y pipe 30 and the other side is composed of a gas hose (32) for transferring the supplied gas is coupled to each of the inlet (23).

이하 본 발명의 실시 예에 의한 작용을 첨부도면과 연계하여 설명하면 다음 과 같다.Hereinafter, the operation according to the embodiment of the present invention will be described in connection with the accompanying drawings.

상기 노즐 삽입구(100)에 노즐(13)을 삽입하면 상기 고정수단(12)에 의해 상기 노즐을 노즐 삽입구(100)에 고정시키고, 상기 노즐 돌출부(10)에 돌출된 용접 와이어(14)에 의해 용접이 시행되면, 상기 노즐(13)에선 보호가스가 분사된다.When the nozzle 13 is inserted into the nozzle insertion hole 100, the nozzle is fixed to the nozzle insertion hole 100 by the fixing means 12, and the welding wire 14 protrudes from the nozzle protrusion 10. When welding is performed, a protective gas is injected from the nozzle 13.

이때, 상기 가스 공급부(300)에 보호가스가 공급되고, 상기 Y관(30)에 의해 각 가스호스(32)로 나뉘어서 상기 이중노즐(200)에 보호가스가 투입되면, 상기 분사구(20)에서 보호가스가 분사된다.In this case, when the protective gas is supplied to the gas supply unit 300, divided into the gas hoses 32 by the Y pipe 30, and the protective gas is introduced into the double nozzle 200, the injection port 20 Protective gas is injected.

상기 이중노즐(200) 내부에 미세철망(21)을 설치하여 분사구(20)에서 보호가스가 고르게 분사되도록 하며, 이물질이 분출되지 않도록 방지한다.By installing the fine wire mesh 21 inside the double nozzle 200 to ensure that the protective gas is evenly sprayed from the injection hole 20, to prevent the foreign matter is ejected.

상기 미세철망(21)은 사용중 이물질 등에 의해 막힐 수가 있는데, 이를 교환할 수 있도록 상기 이중노즐(200) 양측면에 뚜껑(22)을 구비하였다.The fine wire mesh 21 may be clogged by foreign matters in use, and the lid 22 is provided on both sides of the double nozzle 200 to exchange the same.

또한, 용접속도가 빠른 로봇에 사용되는 노즐(13)에 탈,부착이 가능하도록 노즐 삽입구(100)를 가공하였으며, 용접방향의 전,후에 분사구(20)가 위치할 수 있도록 고정 수단(12)을 구비하였다.In addition, the nozzle insertion hole 100 was machined to be attached and detached to the nozzle 13 used in the robot having a high welding speed, and the fixing means 12 is positioned so that the injection hole 20 can be positioned before and after the welding direction. It was provided.

본 발명은 완전히 응고되지 않은 용접비드(41)가 공기와 접촉되어 산화되는 것을 방지하기 위해 인코넬 용접로봇용 토치에 설치된 별도 이중 분사 노즐로서 용접 속도에 관계없이 일정한 실딩효과를 내기 위해 노즐(13)에서 분사되는 보호가스 외에 상기 분사구(20)에서 분사되는 보호가스에 의해 모재(40)의 넓은 범위에 분사되어 용접비드(41)가 공기에 노출되는 것을 지연하여 산화되는 것을 방지한다.The present invention is a separate double spray nozzle installed in a torch for an Inconel welding robot to prevent oxidation of the welding bead 41 is not completely solidified in contact with the air nozzle 13 to produce a constant shielding effect regardless of the welding speed In addition to the protective gas is injected from the injection by the injection gas from the injection hole 20 is sprayed on a wide range of the base material 40 to prevent the welding bead 41 is exposed to air to prevent oxidation.

본 발명은 상술한 특정의 바람직한 실시 예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위 내에 있게 된다.The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

상술한 바와 같이 본 발명은 용접로봇용 토치에 설치된 별도의 이중노즐로서 용접 속도에 관계없이 항상 일정한 실딩 효과를 나타내며, 특히 보호가스의 원활한 분사 유도를 위해 이중노즐 내부에 미세한 철망을 설치하여 가스가 일정하게 분사되도록 하여 균일한 범위로 보호하여 용접비드가 공기와 접촉되어 산화되는 것을 방지하고, 용접비드가 고르게 형성되어 제품의 불량률을 억제해 생산성을 크게 높이는 효과가 있다.As described above, the present invention is a separate double nozzle installed in the torch for welding robots, which always shows a constant shielding effect regardless of the welding speed, and in particular, a fine wire mesh is installed inside the double nozzle for smooth injection of the protective gas. By uniformly sprayed to protect in a uniform range to prevent the welding bead is oxidized in contact with the air, the weld bead is formed evenly to suppress the defective rate of the product to increase the productivity significantly.

Claims (3)

용접 노즐을 중심에 관통 삽입하여 고정하는 노즐 삽입구와, 상기 노즐 삽입구 중심으로 양측 하단에 보호가스를 분사하는 분사구와, 상기 분사구에 보호가스를 주입하는 주입구로 구성된 이중노즐과;A dual nozzle including a nozzle insertion hole for inserting and fixing a welding nozzle through the center, an injection hole for injecting a protection gas at both ends of the nozzle insertion hole, and an injection hole for injecting a protection gas into the injection hole; 상기 이중노즐의 주입구로 가스를 공급하는 가스 공급부;로 구성되되,Consists of a gas supply unit for supplying gas to the injection port of the double nozzle, 상기 이중노즐 내부에는 분사구를 덮어 가스가 균일하게 분사되게 하는 미세철망을 구비하고, 상기 이중노즐 양측에는 상기 미세철망을 교체할 수 있게 개폐되는 뚜껑이 설치되며, Inside the double nozzle is provided with a fine wire mesh to cover the injection port to inject gas uniformly, both sides of the double nozzle is provided with a lid for opening and closing to replace the fine wire mesh, 상기 이중노즐은 일측에 노즐 삽입구로 삽입된 노즐을 가압하여 고정시키는 고정수단이 설치되어, 용접이 진행된 용접비드에 추가적으로 가스를 더 분사하는 것을 특징으로 하는 이중 보호가스 분사노즐.The double nozzle is provided with a fixing means for pressing and fixing the nozzle inserted into the nozzle insertion hole on one side, the double protective gas injection nozzle, characterized in that for further injection of gas to the welding bead is advanced. 삭제delete 삭제delete
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106903412A (en) * 2017-04-28 2017-06-30 成都大漠石油技术有限公司 Beneficial to the device for improving large-scale pipeline welding quality

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11277238A (en) 1998-03-31 1999-10-12 Hitachi Zosen Corp Gas shielded arc welding torch for groove of thick wall

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11277238A (en) 1998-03-31 1999-10-12 Hitachi Zosen Corp Gas shielded arc welding torch for groove of thick wall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106903412A (en) * 2017-04-28 2017-06-30 成都大漠石油技术有限公司 Beneficial to the device for improving large-scale pipeline welding quality

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