• Title, Summary, Keyword: FCAW

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Effects of Welding Parameters on Weld Metal Strength and Recovery of Alloying Elements in FCAW (FCAW에서 용접변수에 따른 용접금속 강도 및 와이어 합금원소의 회수율 변화)

  • Jung, Dong-Hee;Bang, Kook-Soo;Park, Chan;Chang, Woong-Sung;Park, Chul-Gyu
    • Journal of Welding and Joining
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    • v.26 no.2
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    • pp.69-74
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    • 2008
  • 590MPa grade weldable steels were gas metal arc welded with flux cored wires. Welding parameters such as current, voltage, and speed were varied independently. Effects of each parameter on the strength and chemical composition of weld metal were investigated. Increase of voltage caused decrease of weld metal tensile strength due to the low recovery of alloying elements such as carbon and manganese. On the contrary, increase of current and speed resulted in increase of weld metal strength because of higher recovery of the alloying elements.

A Study of Validation of FCAW & PWHT Condition in 10%Cr Casting Steel (10%Cr 주강품의 보수용접 방법 및 용접후열처리 조건 타당성 검토)

  • Lee, Gyeong-Un;Ji, Byeong-Ha;Gwon, Hui-Gyeong;Lee, Myeong-Yeol
    • Proceedings of the KWS Conference
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    • pp.45-47
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    • 2007
  • 주강소재 보수용접부의 품질 및 용접생산성 향상을 위해 기존 용접후열처리 조건(이하 PWHT)을 모재에 적용하는 품질열처리(이하 NTT)로의 대체 및 반자동 FCAW 용접방법의 적용 가능성을 확인하기 위해 상온 및 고온 물성평가(고온인장강도, 크리프 파단강도)를 수행한 결과, 제작 공정 측면에서 FCAW의 적용이 가능한 것으로 확인되었다. 또한 PWHT 대신 NTT를 적용함으로서 용접방법별 물성 편차가 줄어드는 NTT 열처리의 긍정적 효과가 확인되어, 궁극적으로 기존 PWHT 및 NTT 모두 적용이 가능한 것으로 확인되었다.

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A Study on the Mechanical Properties of Welding Parameters of GMAW and FCAW in High-strength Structural Steel(ATOS80) (ATOS80 고장력강의 GMAW와 FCAW의 용접 변수에 따른 기계적 특성 연구)

  • Oh, Gui-Ho
    • Journal of the Korean Society of Mechanical Technology
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    • v.19 no.3
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    • pp.409-414
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    • 2017
  • In this study, we investigate the mechanical and metallurgical properties of the gas metal arc welding. According to flux cored arc welding parameters during welding ATOS80, improving the working conditions of the welding industry to use high strength steel ATOS80 we propose to. Weld test is the tensile strength, yield strength, elongation, hardness, brittleness, such as macro-structure check of the mechanical properties and the weld, the microstructure inspection, defects of the weld subjected to radio-graphic inspection and tissue after welding the test pieces according to the condition variable comparative analysis was investigated by the state.

A Feasibility Study on the Application of Self-Shielded Flux Cored Arc Welding Process for the On-Site Steel Bridge Box Fabrication (교량용 강재 박스의 현장 제조시 셀프실드 플럭스코어드 아크용접의 적용 타당성에 대한 연구)

  • Hwang, Yong-Hwa;Koh, Jin-Hyun;Oh, Se-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.6 no.2
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    • pp.122-128
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    • 2005
  • A feasibility study on the application of self?shielded flux cored arc welding to the on-site SM520 steel bridge box fabrication for express trains and high way construction instead of gas-shield flux cored arc welding was conducted in terms of weld soundness, mechanical properties, toughness and microstructures. All welded specimens made with the self?shielded FCAW process were tested by magnetic particle and ultrasonic techniques and they were found to be sound. All multipass weld specimens made with both self-shielded and gas-shielded FCAW processes showed yield and tensile strengths of $462{\sim}549\;MPa$ and $548{\sim}640\;MPa$, respectively. The impact values of Charpy V-Notch weld specimens also met with the required value of 40J at $-20^{\circ}C$. The hardness values of the top area of weldments were higher than those of the bottom area because of higher residual stresses in the near surface. It was found that welding characteristics of SM520 steel by the on-site welding conditions with self-shielded FCAW showed almost equivalent to those by gas-shielded FCAW in terms of sound welds, mechanical properties and microstructure.

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Development of Seam-Tracking system for FCAW Arc Sensor (FCAW 용접용 용접선 추적 시스템 개발(아-크센서))

  • 권순창;최재성;장낙영
    • Proceedings of the KWS Conference
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    • pp.134-137
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    • 1994
  • In this study, The mean weld current is used to correct depth direction, and weight-value, specially devised to check right-left deviation by placing more weight on the left- and right-most part of weld current during weaving, to correct weaving direction. The methodology of “design of experiments” was introduced to find out dorminant weld parameters affecting these for values.

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Study on the Addition and the Transfer of Alloying Elements in FCAW (FCAW에 의한 합금 성분의 첨가와 이행에 관한 연구)

  • 김경중;박관호
    • Journal of Welding and Joining
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    • v.1 no.2
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    • pp.76-82
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    • 1983
  • The chemical composition of deposit metal by flux cored arc welding can be easily regulated though addition of deoxidizers and alloying elements in cored flux and fluxes of flux coored wire arc analogous to those of coated electrode. It is necessary to investigate the transfer and yield efficiency due to addition of necessary alloy elements in deposit metal. This report is made to intorduce an experimental equation from the relation between welding condition and extent of penetration, deposit metal and weld melt slag and to estimate transfer and yield efficiency of alloy components in fluxes through chemical analysis of deposit metal.

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Modeling of Arc Blow for FCAW (FCA 용접의 아크 블로우 모델링)

  • Go Seong Hun
    • Proceedings of the KWS Conference
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    • v.43
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    • pp.202-204
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    • 2004
  • The purpose of this study is to evaluate the effects of welding conditions on the shape of arc of FCAW using high speed camera system. Length and deflection of arc were evaluated from images of arc which were transformed by threshold processing. Based on the experimental results, a regression model for the length of arc was established. A major factor affecting deflection of arc was the length of arc.

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A Study on the Development of 1 Pool-twin FCAW for One-side Butt Welding in Thick Plates (후판 편면 맞대기 용접을 위한 1 Pool-twin FCAW의 개발에 관한 연구)

  • 박금기;최우현;조상명
    • Proceedings of the KWS Conference
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    • pp.33-35
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    • 2004
  • 선박건조의 탑재공정에 있어서 용접장이 긴 후판 맞대기 용접에는 SAW가 대부분 적용되고 있지만 컨테이너 운반선의 UPPER DECK나 HATCH COAMING TOP PLATE 같은 경우 용접장이 짧고 작업공간이 협소하여 SAW가 적용되지 못하고 있다. (중략)

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The Characteristics of Magnetic Field in Multi-Torches FCAW (다전극 FCAW의 전극 간격에 따른 자기장 특성)

  • Go, Seong-Hun
    • Proceedings of the KWS Conference
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    • pp.69-70
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    • 2005
  • In order to prevent the arc blow at the FCA welding system with multi-torches, the effects of arc length on the magnetic flux at the FCA weldment was evaluated using electro-magnetic filed analysis. Magnetic flux density around arc are slightly increased with an increase in the arc length. Based on the FEA results, the minimum distance of torches to control arc blow was established.

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