• Title/Summary/Keyword: FCA 용접

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A Study on Development of Arc Sensor for Arc Welding Robot Using Consumable Electrode (소모성 전극을 사용하는 아크용접 로봇을 위한 아크센서 개발에 관한 연구)

  • 이승영;문형순;나석주;장영주;안병규
    • Journal of Welding and Joining
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    • v.11 no.3
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    • pp.22-33
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    • 1993
  • Arc sensor is indispensable to arc welding robot systems for compensating the joint misalignment such as mismatch of the workpiece, ill-conditioned positioner and thermal deformation during welding. Furthermore, the amount of these mismatches cannot be preivously expected, and changes from time to time. There are many kinds of seam trackers for correcting the welding path of the robot, where non-contact type sensors arc prevalently used in arc welding robot systems. In this study, an arc sensor was developed for GMA and FCA welding robot system. Since the arc sensor uses the arc characteristics during welding, the operating principle of the arc sensor must be adjusted according to the welding condition. Especially in GMA welding with the $CO_{2}$ shielding gas, the welding arc is not stable because of the short circuit and non-axial globular transfer mode of the molten droplet. In this study, the 2nd order least square curve fitting algorithm was adopted and the applicability of this algorithm was investigated for robot welding systems. For easy usage of the arc sensor, the operating parameters for arc sensor were limited to eight which can be easily determined by the operator.

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A Study on Current Decision of Lead-Trailing Torch for Defect Improvement in Tandem Fillet Welding (탄뎀 필릿용접 불량개선을 위한 선후행 토치의 전류 결정에 관한 연구)

  • 박대규;양종수;조상명
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.92-94
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    • 2004
  • 선박 건조 시 적용되는 여러 가지 용접기법 중 가장 많이 적용되는 기법 중 하나가 FCA용접 (Flux Cored Arc Welding)이다. 일반적으로 100% $CO_2$ 가스를 사용하고, 플럭스 코어드 와이어를 사용하여 자동 또는 반자동 용접에 적용한다. (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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    • 2005.06a
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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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A Study on the Welding Properties of SM570TMC Steel Plate (SM570TMC 강재의 용접부 특성에 관한 연구)

  • Im, Sung Woo;Chang, In Hwa;Chung, Woo Hyun
    • Journal of Korean Society of Steel Construction
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    • v.18 no.5
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    • pp.665-675
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    • 2006
  • With building structures becoming higher and longer-spanned, the need for high-strength and reliable steel is increasing. For this reason, the SM570TMC steel plate was developed. Despite its excellent mechanical properties, however, its welding properties, which are well-known to be superior to those of other equivalent steel plates, have not been verified yet. In this study, welding specimens fabricated via SA and FCA welding, with two domestic welding materials and one Japanese welding material in site welding conditions, were evaluated.

Analysis of Welding Residual Stress Redistributions on Notched Multi-pass FCA Butt Weldment (노치가공에 의한 다층 FCA 용접부의 잔류응력 재분포 특성)

  • Bang, Hee-Seon;Bang, Han-Sur;Oh, Ik-Hyun;Kim, Jun-Hyung
    • Journal of Welding and Joining
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    • v.28 no.1
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    • pp.86-91
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    • 2010
  • In the present study, two-dimensional plane deformation thermo elasto-plastic analysis has been carried out, in order to investigate the thermal and mechanical behaviour (residual stress, plastic strain, magnitude of stress and their distribution and production mechanism) on multi-pass FCA butt weldment of high strength EH36-TMCP ultra thick plate. Moreover, this study can be considered as a basis for analysing the fracture toughness, KIC, and its effect on welding residual stress redistribution with notch on multi-pass FCA butt weldment, in future. The results of welding residual stress obtained from thermo elasto-plastic analysis has been compared and verified with the results measured by XRD.