KR101069133B1 - Method for manufacturing a welding rod - Google Patents

Method for manufacturing a welding rod Download PDF

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Publication number
KR101069133B1
KR101069133B1 KR1020080085649A KR20080085649A KR101069133B1 KR 101069133 B1 KR101069133 B1 KR 101069133B1 KR 1020080085649 A KR1020080085649 A KR 1020080085649A KR 20080085649 A KR20080085649 A KR 20080085649A KR 101069133 B1 KR101069133 B1 KR 101069133B1
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South Korea
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contact tip
welding
welding rod
manufacturing
tube
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KR1020080085649A
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Korean (ko)
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KR20100026592A (en
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김종섭
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일신태광금속 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Arc Welding In General (AREA)

Abstract

본 발명은 용접작업시 사용하는 용접봉의 제조방법에 관한 것으로, 더욱 상세하게는 외주면의 길이방향을 따라 돌기가 형성되어 표면적이 증대된 콘택트 팁을 장착할 수 있도록 용접봉을 제조하는 방법에 관한 것이다.The present invention relates to a method for manufacturing a welding rod for use in a welding operation, and more particularly, to a method for manufacturing a welding rod so that a protrusion is formed along a longitudinal direction of an outer circumferential surface thereof so as to mount a contact tip having an increased surface area.

이를 위하여 본 발명은 주조 및 압출공정 등을 통해 일정한 길이와 외경을 갖도록 성형되는 중간 성형물(원관)을 일정한 가공공정을 통해 콘택트 팁이 설치되도록 내경부를 형성하는 용접봉 제조방법에 있어서,To this end, the present invention is a welding rod manufacturing method for forming an inner diameter portion so that the contact tip is installed through a uniform processing process of the intermediate molding (circular tube) is formed to have a constant length and outer diameter through a casting and extrusion process,

상기 중간 성형물을 다이스에 삽입 위치한 다음, 외주면의 길이방향을 따라 하나 이상의 돌기가 연장되어 형성된 콘택트 팁의 외경에 해당하는 형상의 인발수단이 승강 동작함에 의해 상기 콘택트 팁이 장착될 수 있는 콘택트 팁 장착부를 갖도록 성형하는 것을 특징으로 하는 용접봉 제조방법을 제공한다.The contact tip mounting portion to which the contact tip can be mounted by inserting and placing the intermediate molding into the die, and then drawing means having a shape corresponding to the outer diameter of the contact tip formed by extending one or more protrusions along the longitudinal direction of the outer circumferential surface thereof. It provides a welding rod manufacturing method characterized in that the molding to have.

용접, 용접봉, 콘택트 팁, 다이스, 인발기 Welding, Welding Rods, Contact Tips, Dies, Drawing Machine

Description

용접봉 제조방법{Method for manufacturing a welding rod}Method for manufacturing a welding rod

본 발명은 용접작업시 사용하는 용접봉의 제조방법에 관한 것으로, 더욱 상세하게는 외주면의 길이방향을 따라 돌기가 형성되어 표면적이 증대된 콘택트 팁을 장착할 수 있도록 용접봉을 제조하는 방법에 관한 것이다.The present invention relates to a method for manufacturing a welding rod for use in a welding operation, and more particularly, to a method for manufacturing a welding rod so that a protrusion is formed along a longitudinal direction of an outer circumferential surface thereof so as to mount a contact tip having an increased surface area.

일반적으로 자동용접기는 용접 와이어 공급기로부터 용접 와이어를 용접 토치측으로 공급하게 되고, 이와 같이 공급된 용접 와이어는 상기 용접 토치의 끝단에 형성된 콘택트 팁을 통해 송급되면서 용접작업이 수행되게 된다.In general, the automatic welding machine supplies the welding wire from the welding wire feeder to the welding torch side, and the welding wire supplied as described above is fed through the contact tip formed at the end of the welding torch to perform the welding operation.

도 1은 일반적인 용접 토치의 구성을 나타내는 도면이고, 도 2는 종래 용접 토치용 콘택트 팁을 나타내는 부분절개 사시도이다.1 is a view showing the configuration of a general welding torch, Figure 2 is a partial cutaway perspective view showing a contact tip for a conventional welding torch.

상기 용접 토치는 도 1에 도시된 바와 같이, 가스가 공급되는 토치바디(10)와, 상기 토치바디(10)에 접속되는 화염부(20)와, 이 화염부(20)의 외부에 결합되는 노즐(30)로 구성되고, 상기 화염부(20)는 가스를 분출시키는 가스디퓨져(22)와 이 가스디퓨져(22)에 결합되는 콘택트 팁(24)으로 구성된다.As shown in FIG. 1, the welding torch is coupled to the torch body 10 to which gas is supplied, the flame part 20 connected to the torch body 10, and the outside of the flame part 20. It consists of a nozzle 30, the flame portion 20 is composed of a gas diffuser 22 for ejecting gas and a contact tip 24 coupled to the gas diffuser 22.

상기 콘택트 팁(24)은 상기 토치바디(10)와 기계적, 전기적 및 열적으로 접속되어 상기와 같은 용접작업의 수행이 가능하도록 하는 소모성 부재로서, 첨부된 도 2에 도시된 바와 같이 대략 환봉 형상을 갖도록 형성된 몸체의 중심부에 상기 용접 와이어가 이송되는 와이어 송급로(24a)가 형성되고 그 일측에는 토치바디(10)측에 기계적, 전기적으로 접속되도록 나사부(24b)가 형성되는 한편 상기 나사부(24b)의 타측에 해당되는 몸체상에는 일정한 경사각을 갖도록 가공된 테이퍼부(24c)가 형성된다.The contact tip 24 is a consumable member that is mechanically, electrically and thermally connected to the torch body 10 to perform the welding operation, and has a substantially round bar shape as shown in FIG. 2. A wire feed path 24a through which the welding wire is transported is formed at the center of the body formed to have a screw portion 24b formed at one side thereof so as to be mechanically and electrically connected to the torch body 10 side while the screw portion 24b is formed. On the body corresponding to the other side of the tapered portion (24c) is formed to be processed to have a constant inclination angle.

한편, 상기와 같이 구성된 용접토치에 의해 용접작업이 수행되는 자동용접기에서의 용접품질과 작업성은 용접 와이어의 송급이 정확하고 안정되게 수행되도록 유지시키는 것이 매우 중요하다. On the other hand, the welding quality and workability in the automatic welding machine in which the welding operation is performed by the welding torch configured as described above is very important to maintain the feeding of the welding wire accurately and stably.

그러나, 이러한 용접토치는 고온의 열을 동반하는 화염이 발생되면서 직접적인 용접이 수행되는 콘택트 팁의 끝 부분이 쉽게 손상되거나 마모되고 변형되면서 용접 와이어의 안정된 송급을 유지할 수 없게 되는 문제가 발생하여 용접작업 중에 수시로 콘택트 팁을 교체하면서 용접작업을 수행하게 된다.However, such a welding torch has a problem that the flame of the high temperature heat is generated and the tip of the contact tip where the direct welding is performed is easily damaged, worn, or deformed, and thus it is impossible to maintain a stable supply of welding wire. Often during the welding process, the contact tip is replaced.

또한, 콘택트 팁의 잦은 교체로 인해 비용낭비를 초래하게 되며, 작업이 수시로 중단되어 작업효율이 저하되는 문제도 발생한다.In addition, the frequent replacement of the contact tip causes a waste of cost, the work is interrupted from time to time causes a problem that the work efficiency is reduced.

본 발명은 상기와 같은 문제점을 해결하기 위해 발명한 것으로서, 용접열에 의한 변형속도를 감소시키기 위하여 표면적을 증대하여 형성한 콘택트 팁을 장착할 수 있도록 용접봉을 제조하는 방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, an object of the present invention is to provide a method for manufacturing a welding rod to mount a contact tip formed by increasing the surface area in order to reduce the deformation rate due to welding heat.

상기한 목적을 달성하기 위해 본 발명은 용접봉 제조방법에 있어서,In order to achieve the above object, the present invention provides a welding rod manufacturing method,

원자재를 압착기에 투입하여 압착하는 압착단계와; 압착된 원자재를 고주파 유도로에 투입하여 가열 용해하는 용해단계와; 용해된 원자재를 주조기로 이송하여 빌레트로 주조 성형하는 주조단계와; 주조된 빌레트를 절단기로 절단한 다음, 전기가열로에서 가열하여 압출기에서 원관으로 압출 성형하는 압출단계와; 압출된 원관을 다이스에 삽입 위치한 다음, 콘택트 팁의 외경에 해당하는 형상의 인발수단이 승강동작하여 상기 원관 내부에 콘택트 팁이 장착될 수 있는 콘택트 팁 장착부를 형성하는 인발단계와; 인발된 원관의 길이방향에 대해 직각을 이루도록 하여 원하는 길이로 절단하는 절단단계와; 절단된 원관의 직진도를 교정하는 교정단계;를 포함하여 이루어지는 것을 특징으로 하는 용접봉 제조방법을 제공한다.A pressing step of putting the raw materials into the pressing machine and pressing the raw materials; A dissolution step of heating and melting the compressed raw material into a high frequency induction furnace; A casting step of casting the melted raw material by casting into a billet; An extrusion step of cutting the cast billet with a cutter, and then heating in an electric heating furnace and extruding the original billet into an original tube in an extruder; A drawing step of inserting the extruded raw tube into a die and then drawing a drawing means corresponding to the outer diameter of the contact tip to move up and down to form a contact tip mounting portion in which the contact tip can be mounted inside the raw tube; A cutting step of cutting at a desired length by making a right angle with respect to the longitudinal direction of the drawn tube; It provides a welding rod manufacturing method comprising a; correcting step of correcting the straightness of the cut tube.

여기서, 상기 콘택트 팁은 외주면의 길이방향을 따라 하나 이상의 돌기가 연장되어 형성된 것을 특징으로 한다.Here, the contact tip is characterized in that formed by extending one or more projections along the longitudinal direction of the outer peripheral surface.

본 발명에 따른 용접봉 제조방법은 용접열에 의한 변형속도를 감소시키기 위하여 표면적을 증대하도록 형성된 콘택트 팁을 장착할 수 있는 용접봉을 제조함으 로써 사용수명이 연장된 콘택트 팁을 이용하여 잦은 교체 등으로 인한 지출비용을 감소시키는 효과가 있다.Welding rod manufacturing method according to the present invention by manufacturing a welding rod that can be equipped with a contact tip formed to increase the surface area in order to reduce the deformation rate due to the heat of welding, the expenditure due to frequent replacement by using a contact tip with an extended service life This has the effect of reducing costs.

또한, 콘택트 팁의 잦은 교체로 인해 용접작업이 중단되는 것을 방지하여 작업효율이 증대되는 효과를 기대할 수 있다.In addition, the welding tip is prevented from being interrupted due to frequent replacement of the contact tip, thereby increasing the work efficiency.

본 발명에서 사용한 용어는 단지 특정한 실시 예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니며, 단수의 표현은 문맥상 명백히 다르게 뜻하지 않는 한 복수의 표현을 포함한다.The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present disclosure, and the singular forms “a”, “an” and “the” include plural forms unless the context clearly indicates otherwise.

본 발명의 실시 예로는 다수 개가 존재할 수 있으며, 설명에 있어서 종래의 기술과 동일한 부분에 대하여 중복되는 설명은 생략되는 것도 있다.There may be a plurality of embodiments of the present invention, and overlapping descriptions of the same parts as in the prior art may be omitted.

이하, 첨부된 도면을 참조로 하여 본 발명의 바람직한 일실시 예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

본 발명에 따라 바람직하게 실시되는 용접봉 제조방법은 외주면의 길이방향을 따라 돌기를 형성하여 표면적을 증대한 콘택트 팁을 장착할 수 있는 용접봉을 제조하도록 실시된다.Welding rod manufacturing method preferably carried out according to the present invention is carried out to produce a welding rod that can be attached to the contact tip to increase the surface area by forming a projection along the longitudinal direction of the outer peripheral surface.

첨부한 도 3은 본 발명에 따른 용접봉 제조방법에 따라 제작되는 용접봉에 장착되는 콘택트 팁의 횡단면도이고, 도 4는 본 발명에 따른 용접봉 제조방법을 나타내는 개략적인 흐름도이다.3 is a cross-sectional view of a contact tip mounted on a welding rod manufactured according to a welding rod manufacturing method according to the present invention, and FIG. 4 is a schematic flowchart showing the welding rod manufacturing method according to the present invention.

본 발명은 도 3에 도시된 바와 같은 콘택트 팁(100)을 장착하는 용접봉을 제 조하기 위한 것으로서, 이를 위하여 도 4에 도시된 바와 같이, 통상적인 외관검사 및 성분검사 과정 등을 거쳐 표면에 불순물이 없고 해로운 결함이 없는 용접봉의 원자재를 지게차 등의 이송수단을 이용하여 압착기로 이송한다.The present invention is for manufacturing a welding rod for mounting the contact tip 100 as shown in Figure 3, for this purpose, as shown in Figure 4, impurities on the surface through a conventional visual inspection and component inspection process, etc. The raw material of the welding rod free from harmful defects is transferred to the press using a conveying means such as a forklift truck.

상기 원자재는 통상적으로 이용되는 구리이며 그 순도는 99.0% 이상의 것을 사용하고, A급 구리(순도 99.99% 이상의 구리)와 B급 구리(다른 성분이 혼합된 순도 99.9%의 구리) 및 용접봉 제조과정에서 사용되고 남은 재활용 구리(순도 99.9% 이상의 구리) 등을 3:4:3의 비율로 압착기에 투입한다.The raw material is copper commonly used, the purity of which is 99.0% or more, and the grade A copper (purity of 99.99% or more) and class B copper (purity of 99.9% copper mixed with other components) and welding rod The remaining recycled copper (copper having a purity of 99.9% or more) and the like are introduced into the compactor at a ratio of 3: 4: 3.

그리고, 상기 압착기에서 압착되어 배출되는 원자재를 고주파 유도로에 투입하여 원자재의 화학성분에 적합한 용해과정을 거쳐 균일하게 혼합하도록 한다. 통상적으로 상기 고주파 유도로의 가열온도는 약 1200~1240℃정도이며 약 100~140분에 걸쳐 가열 용해한다. In addition, the raw material is compressed and discharged from the compactor is put into a high frequency induction furnace to be uniformly mixed through a dissolution process suitable for the chemical composition of the raw material. Typically, the heating temperature of the high frequency induction furnace is about 1200 to 1240 ° C. and is dissolved by heating over about 100 to 140 minutes.

이와 같이 용해된 원자재는 수직연속주조기로 이동되어 갈라짐이나 기포, 홈 등의 유해한 결함이 발생하지 않도록 빌레트로 주조 성형하며, 절단기를 이용하여 주조된 빌레트를 일정 길이로 절단한다.The raw materials dissolved in this way are cast into a billet to prevent harmful defects such as cracking, bubbles, and grooves from being transferred to a vertical continuous casting machine, and the cast billet is cut to a predetermined length using a cutter.

상기와 같이 절단된 빌레트는 컨베이어를 통해 전기가열로로 이송되어 약 800~900℃에서 약 2~3분 동안 가열한 다음, 압출기에서 푸쉬-백(push-back)식으로 압출하여 원관으로 형성한 후, 균열이 없고 균일한 품질로 정리한다.The billet cut as described above is transferred to an electric heating furnace through a conveyor, heated at about 800 to 900 ° C. for about 2 to 3 minutes, and then extruded by a push-back type in an extruder to form a raw tube. Afterwards, there is no crack and the uniform quality is summarized.

그리고, 본 발명은 다음과 같은 인발 공정 단계를 거쳐 용접봉 내부(내경부)에 외주면의 길이방향으로 하나 이상의 돌기(130) 등이 형성되어 대략 별 모양으로 형성된 도 3과 같은 콘택트 팁을 장착할 수 있도록 형성한다.In addition, the present invention may be equipped with a contact tip as shown in FIG. 3 formed in a star shape by forming one or more protrusions 130 in the longitudinal direction of the outer circumferential surface of the welding rod through the following drawing process steps. To form.

본 발명에 따른 인발공정에서 인발을 위한 인발기의 다이스에 삽입되어 위치된 성형물(원관)은 콘택트 팁의 외경에 해당하는 인발수단의 프레싱 작용과 상기 인발기의 상승 이탈 과정을 통해 그 내부에 목적하는 내경(콘택트 팁의 외경 이상)의 콘택트 팁 장착부(콘택트 팁이 장착되는 부분)를 성형하게 된다.In the drawing process according to the present invention, the molded part (original tube) inserted and placed in the die of the drawing machine for drawing has a purpose therein through the pressing action of the drawing means corresponding to the outer diameter of the contact tip and the process of lifting up the drawing machine. The contact tip mounting portion (part on which the contact tip is mounted) having an inner diameter (or larger than the outer diameter of the contact tip) is molded.

그리고, 절단기를 이용하여 원하는 길이로 절단하되 성형물(원관)의 길이방향에 대해 직각을 이루도록 한 다음, 교정공정을 거쳐 직진도가 잘 나오도록 교정한다.Then, using a cutter to cut to the desired length to form a right angle to the longitudinal direction of the molding (circle), and then straightening through the calibration process to straighten out.

이상에서는 본 발명을 특정의 바람직한 실시 예에 대하여 도시하고 설명하였으나, 본 발명은 이러한 실시 예에 한정되지 않으며, 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 특허청구범위에서 청구하는 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 실시할 수 있는 다양한 형태의 실시 예들을 모두 포함한다.While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to these embodiments, and those of ordinary skill in the art claim the invention as claimed in the appended claims. It includes all embodiments of the various forms that can be carried out without departing from the spirit.

도 1은 일반적인 용접 토치의 구성을 나타내는 도면, 1 is a view showing the configuration of a general welding torch,

도 2는 종래 용접 토치용 콘택트 팁을 나타내는 부분절개 사시도,Figure 2 is a partial cutaway perspective view showing a contact tip for a conventional welding torch,

도 3은 본 발명에 따른 용접봉 제조방법에 따라 제작되는 용접봉에 장착되는 콘택트 팁의 횡단면도,3 is a cross-sectional view of a contact tip mounted on a welding rod manufactured according to a welding rod manufacturing method according to the present invention;

도 4는 본 발명에 따른 용접봉 제조방법을 나타내는 개략적인 흐름도.Figure 4 is a schematic flowchart showing a welding rod manufacturing method according to the present invention.

Claims (2)

삭제delete 용접봉 제조방법에 있어서,In the welding rod manufacturing method, 원자재를 압착기에 투입하여 압착하는 압착단계와;A pressing step of putting the raw materials into the pressing machine and pressing the raw materials; 압착된 원자재를 고주파 유도로에 투입하여 가열 용해하는 용해단계와;A dissolution step of heating and melting the compressed raw material into a high frequency induction furnace; 용해된 원자재를 주조기로 이송하여 빌레트로 주조 성형하는 주조단계와;A casting step of casting the melted raw material by casting into a billet; 주조된 빌레트를 절단기로 절단한 다음, 전기가열로에서 가열하여 압출기에서 원관으로 압출 성형하는 압출단계와;An extrusion step of cutting the cast billet with a cutter, and then heating in an electric heating furnace and extruding the original billet into an original tube in an extruder; 압출된 원관을 다이스에 삽입 위치한 다음, 콘택트 팁의 외경에 해당하는 형상의 인발수단이 승강동작하여 상기 원관 내부에 콘택트 팁이 장착될 수 있는 콘택트 팁 장착부를 형성하는 인발단계와;A drawing step of inserting the extruded raw tube into a die and then drawing a drawing means corresponding to the outer diameter of the contact tip to move up and down to form a contact tip mounting portion in which the contact tip can be mounted inside the raw tube; 인발된 원관의 길이방향에 대해 직각을 이루도록 하여 원하는 길이로 절단하는 절단단계와;A cutting step of cutting at a desired length by making a right angle with respect to the longitudinal direction of the drawn tube; 절단된 원관의 직진도를 교정하는 교정단계;A calibration step of correcting the straightness of the cut tube; 를 포함하며, Including; 상기 콘택트 팁은 외주면의 길이방향을 따라 하나 이상의 돌기가 연장되어 형성된 것을 특징으로 하는 용접봉 제조방법.The contact tip is a welding rod manufacturing method, characterized in that formed by extending at least one projection along the longitudinal direction of the outer peripheral surface.
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KR20000036311A (en) * 1999-12-30 2000-07-05 김태차 manufacturing method for square welding rod
KR20010091183A (en) * 2000-03-13 2001-10-23 김홍물 flux-mixed Al welding element and Fabrication of it and continuous welding method using it
KR20050080164A (en) * 2005-07-20 2005-08-11 주식회사 동화 티.씨이.에이 A manufacturing method of welding tip and its press system
JP2007331022A (en) 2006-06-19 2007-12-27 Iwatani Industrial Gases Corp Method for manufacturing stainless steel welding wire

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Publication number Priority date Publication date Assignee Title
KR20000036311A (en) * 1999-12-30 2000-07-05 김태차 manufacturing method for square welding rod
KR20010091183A (en) * 2000-03-13 2001-10-23 김홍물 flux-mixed Al welding element and Fabrication of it and continuous welding method using it
KR20050080164A (en) * 2005-07-20 2005-08-11 주식회사 동화 티.씨이.에이 A manufacturing method of welding tip and its press system
JP2007331022A (en) 2006-06-19 2007-12-27 Iwatani Industrial Gases Corp Method for manufacturing stainless steel welding wire

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