• Title/Summary/Keyword: flux cored wire

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GTAW of Titanium Using Flux Cored Wire (플럭스 코어드 와이어를 이용한 티타늄의 GTAW)

  • ;Stephen Liu
    • Proceedings of the KWS Conference
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    • pp.182-184
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    • 2004
  • GTAW of titanium using flux cored wire was exploited. Flux cored wire with MgF$_2$ resulted in 60% deeper penetration than conventional active GTAW which applys fluxes in the form of paste. Emission spectroscopy of the arc with MgF$_2$ showed Ti II peak, indicating higher temperature arc. Elux cored wire formed weld metal with reasonably low oxygen content.

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Characteristics of GMA Weld Zone on TiO2 Different Component Flux Cored Wire for S500 Grade Steel (TiO2 성분 플럭스충진와이어에 따른 S500강의 GMA 용접부 특성)

  • Yoo, Cheol;Ko, Young-Bong;Park, Kyeung-Chae
    • Journal of the Korean institute of surface engineering
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    • v.48 no.6
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    • pp.335-342
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    • 2015
  • Recently, the production of oil and gas at the arctic ocean and offshore has been growing. Accordingly, S500 steel with the high tensile strength and excellent toughness has been used and flux cored wire that can be welded to the S500 has been required. In this study, we carried out observation of microstructures, mechanical properties and CTOD (crack tip openning displacement) in the weld zone that GMA (gas metal arc) welded with different component of $TiO_2$ flux core wire (the main components, rutile or Ti-slag) for S500 steel. Weld zone produced with Ti-slag flux cored wire has formed a enough acicular ferrite and shown excellent impact toughness at $-40^{\circ}C$, tensile strength at room temperature and CTOD at $-20^{\circ}C$. As a result, the developed flux cored wire was suitable for S500 steel.

Flux Cored Wire의 특성 및 사용상의 유의점

  • 김경중
    • Journal of Welding and Joining
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    • v.6 no.3
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    • pp.8-20
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    • 1988
  • 현재 국내산업발달과 작업현장 여건의 변화 등으로 인하여 노동집약적 산업형태로부터 기술집약형 산업형태로 바뀌어져 가고 있으며, 이에 수반되는 것이 자동화 system임에 따라 자동, 반자동 용접의 채택이 급격히 증대되고 있는 실정이다. 여기서는 이러한 용접기술의 동향과 최근 발전되고 있는 Flux Cored Wire에 대하여 기술하고자 한다.

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A Study on Fatigue Strength Characteristics of Weld Joint using Metal Type Flux Cored Wire (금속계 플럭스들이 용접이음부의 피로강도 특성에 관한 연구)

  • 강성원;신동진;김환식
    • Journal of Welding and Joining
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    • v.12 no.4
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    • pp.151-161
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    • 1994
  • FCAW has wide application in ship fabrication, maintenance and field erection. It has many advantages over SMAW.SAW and GMAW process. In many applications, the FCAW provides highquality weld metal. This method can reduce weld defects especially porosity and spatter. But the fatigue characteristics of those deposited metal have been rarely investigated. The purpose of this study is to investigate the cyclic stress-strain behavior and fatigue tests by the constant strain control were carried out on the rounded smooth specimen with deposited metal using the metal type flux cored wire. As the results of this study for the deposited metal welded by the metal type flux cored wire, the hardening or softening characteristics under cyclic load were investigated and cyclic stress-strain curve, strain-fatigue life curve, stress-strain function and fatigue life relation which are useful to estimate the fatigue life under the stress concentration condition were obtained.

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Wear Resistance Evaluation of Contact Tip according to Flux Cored Wire (플럭스 코어드 와이어에 따른 용접 중 콘택트 팁 내마모성 평가)

  • Kim, Dong-Yoon;Hwang, In-Sung;Kim, Dong-Cheol;Kang, Moon-Jin
    • Journal of Welding and Joining
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    • v.31 no.4
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    • pp.42-46
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    • 2013
  • The contact tip for flux cored arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. A damaged contact tip causes a productivity reduction and a welding quality problem. In this study, the welding experiments for the wear resistance of contact tip regarding flux cored wire types were performed. With two fold type and a seamless type flux cored wires, the wear rates of contact tips were compared. In addition, the wear rate was checked according to the contact tip position.

A Study on the Content Variation of Metals in Welding Fumes (용접흄 충 금속함량 변화에 관한 연구)

  • 윤충식;박동욱;박두용
    • Journal of Environmental Health Sciences
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    • v.28 no.2
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    • pp.117-129
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    • 2002
  • Concentration of welding fumes and their components is known to be hazardous to welder and adjacent worker. To determine the generation rates of metals in fumes, $CO_2$ flux cored arc welding on stainless steel was performed in well designed fume collection chamber. Variables were different products of flux cored wire(2 domestic products and 4 foreign products) and input energy(low-, optimal- , high input energy). Mass of welding fumes was determined by gravimetric method(NIOSH 0500 method), and 17 metals were analysed by inductively coupled plasm-atomic emission spectroscopy(NIOSH 7300 method). Flux cored wire tube and flux were analysed by scanning electron microscopy to determine their metal composition. 17 metals were classified by their generation rates. Generation rates of iron, manganese, potassium and sodium were all above 50mg/min at optimal input energy level. Generation rates of chromium and amorphous silica were 25~50mg/min. At 1~25mg/min level, nickel, titanium, molybdenum, and aluminum were included. Copper, zinc, calcium, lead, magnesium, lithium, and cobalt were generated below 1 mg/min. Generation rates of metal components in fumes were influenced by input energy, types of flux cored wire. Flux cored wire was consisted of outer shell tube and inner flux. Iron, chromium, and nickel were the major components of outer tube. Flux contained iron, chromium, nickel, potassium, sodium, silica, and manganese. The use of flux cored wire can increase the hazards by increasing the amounts of fumes formed relative to that of solid wire. The reason might be the direct transfer of elements from the flux, since the flux is fine power. Ratio of metals to the fume of flux cored wire was lower than that of solid wire because non-metal components of flux were transferred. Total metal content of fumes in flux cored arc welding was 47.4(24.3~57.2) percent that is much lower than that of solid wire, 75.9 percent. We found that generation rates of iron, manganese, chromium and nickel, all well known to cause work related disease to welder, increased more rapidly with increasing input energy than those of fumes. To reduce worker exposure to fumes and hazardous component at source, further research is needed to develop new welding filler materials that decrease both the amount of fumes and hazardous components.

The Latest Technology Development Trends of Flux Cored Wire (Flux Cored Wire의 최신 기술 개발 동향)

  • Im, Hee-Dae;Choi, Chang-Hyun;Jung, Jae-Heon;Kil, Woong
    • Journal of Welding and Joining
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    • v.34 no.6
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    • pp.1-10
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    • 2016
  • Flux Cored Wire is the most widely used welding material for Flux Cored Arc Welding these days. This paper introduces the technical aspects of manufacturing FCW and the development trend of FCW for each type of steel and metal. The studies are ongoing to lower the production cost of seamless-type FCW since it has not been generally used in welding shops so far because of it high cost even though the seamless-type FCW has various advantages than folded-type FCW in terms of manufacturing technology. Meanwhile, a technical research has been carried out to develop a rutile type of FCW products which satisfies high toughness after post heat treatment. In addition, for high-speed fillet welding, there has been a development of welding materials which can be welded in Single Auto-Carriage 100 cpm or more and up to Twin Tandem 200 cpm without occurring any welding defect in order to improve the welding productivity. As Zn coated steel is being used recently to improve the corrosion resistance of the automotive parts, a research and development for Metal Cored Wire has been conducted to reduce the Si island produced in welding operation than those produced when using the former solid wires. A development of welding material that guarantees CTOD performance beyond $-40^{\circ}C$ CTOD to $-60^{\circ}C$ is underway by different steel grades, and FCW for super austenitic stainless steel is being developed as the corrosion resistant steel has been upgraded.

Effect of Preheat Temperature on Diffusible Hydrogen Content in Weld Metal Deposited using Flux Cored Wire (시편 예열 온도가 FCW 용착금속의 확산성 수소량에 미치는 영향)

  • Kim, Dong Yoon;Hwang, In Sung;Kim, Dong Cheol;Kang, Moon Jin
    • Journal of Welding and Joining
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    • v.32 no.2
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    • pp.18-21
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    • 2014
  • Cold cracking of weldment is one of the most serious welding problems. A sufficient quantity of diffusible hydrogen, a residual stress, and a sensitive microstructure are the causes of cold cracking. Removal of any one of these factors can be used to prevent cold cracking. Application of flux cored arc welding process is increasing due to high productivity and easiness of welding. In addition, to prevent cold cracking in the HAZ or weldment, preheat temperature and interpass temperature have to be controlled. In this study, the effect of preheat temperature on the levels of diffusible hydrogen in the weld metal deposited using flux cored wire was examined. The levels of preheat temperature of base metal specimen were ambient temperature, 50, 100 and $150^{\circ}C$ respectively. The result showed that the increase of preheat temperature was a linear relationship with reduction of diffusible hydrogen content in weldment.