• Title/Summary/Keyword: Heat Input Distribution

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A Study of Heat Input Distribution on the Surface during Torch Weaving in Gas Metal Arc Welding

  • Kim, Y.;Park, H.
    • International Journal of Korean Welding Society
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    • v.4 no.1
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    • pp.23-29
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    • 2004
  • In weaving welding where a V groove exists, the heat input distribution is an important factor that determines the defectiveness of the bead shape, undercut and over-lap. In this study, the amount of heat input, which is determined by the welding current, voltage, speed and weaving conditions is calculated through mathematical development and numerical methods. Furthermore, the heat input distribution as a two- dimensional heat source was observed when applied to each groove.

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A Study of Heat Input Distribution on the Surface during Torch Weaving in Gas Metal Arc Welding (가스 메탈 아크 용접에서 토치 위빙 중 표면 입열 분포 해석에 관한 연구)

  • 김용재;이세현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.316-319
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    • 2001
  • In weaving welding where a V groove exists, the heat input distribution is an important factor that determines the defectiveness of the bead shape, undercut and over-lap. In this study, the amount of heat input, which is determined by the welding current, voltage, speed and weaving conditions is calculated through numerical methods. Furthermore, the heat input distribution as a two- dimensional heat source was observed when applied to each groove. Therefore, a heat input control algorithm is suggested to prevent the defects generated from undercut or over-lap, which was verified through an analysis of the heat input distribution.

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A Study of Arc Modeling and Heat Input Distribution on the Surface during Torch Weaving in Gas Metal Arc Welding (가스 메탈 아크 용접에서 토치 위빙 중 아크 모델링 및 표면 입열 분포 해석에 관한 연구)

  • Kim, Yong-Jae;Rhee, Se-Hun
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.1
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    • pp.162-170
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    • 2001
  • In torch weaving in arc welding on V groove, the heat input distribution on groove surface is a main factor determining the bead shape and the weld quality with and without the weld defects such as undercut, overlap, etc. In this study, we calculate the heat input varying with the welding current, arc voltage, welding speed and the touch weaving condition using numerical method. And we investigate the heat input distribution on groove surface while applying the various grooves having 2 dimensional heat sources.

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An observer design for the superheater temperature estimation (과열기의 온도추정을 위한 관측기의 구성)

  • 서진헌;황재호;이상혁
    • 제어로봇시스템학회:학술대회논문집
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    • pp.101-106
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    • 1990
  • The problem of constructing an observer for use in the control of superheater temperature with desuperheater is considered. The distributed heat input into the superheater is usually not available for use in the observer, and hence is treated as a disturbance. The observer theory for systems with unknown inputs is exploited and applied to the problem. Approximation of the heat input utilizing the specific heat input distribution pattern is also considered.

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ANALYSIS OF TRANSIENT TEMPERATURE DISTRIBUTION IN ROTATING ARC GMA ELDING BY CONSIDERING DROPLET DEFLECTION

  • Kim, Cheolhee;Na, Suck-Joo
    • Proceedings of the KWS Conference
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    • pp.763-768
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    • 2002
  • This paper presents a mathematical model predicting the temperature distribution in rotating GMA welding. The bead width increases with rotation frequency at the same rotation diameter because the molten droplets are deflected by centrifugal force. The numerical solution is obtained by solving the transient three-dimensional heat conduction equation considering the heat input from the welding arc, cathode heating and molten droplets. Generally in GMA welding the heat input may be assumed as a normally distributed source, but the droplet deflection causes some changes in the heat input distribution. To estimate the heat flux distribution due to the molten droplet, the contact point where the droplet is transferred on the weld pool surface is calculated from the flight trajectory of the droplets under the arc plasma velocity field obtained from the arc plasma analysis. The numerical analysis shows a tendency of broadened bead width and shallow penetration depth with the increase of rotating frequency. The simulation results are in good agreement with those obtained by the experiments under various welding conditions.

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