• Title/Summary/Keyword: 팁인

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Prediction on the Wear Resistance of Contact Tips to welding consumable for GMA Welding (GMA용접에서 용접재료에 따른 콘택트팁 내마모성에 관한 연구)

  • 김남훈;김희진;유회수
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.185-187
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    • 2004

  • GMA용접에서 아크가 안정적으로 진행되기 위해서는 와이어가 공급되는 속도와 와이어가 용융되는 속도가 동일하여야 한다. 이를 위하여 와이어에 적절한 전류를 공급하여 송급된 와이어가 동일한 속도로 용융되도록 하여야 한다. (중략)

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Effect of welding quality to wear of Contact Tips for GMA Welding (GMA용접 동안 콘택트팁 마모가 용접품질에 미치는 영향)

  • 김남훈;김희진;유회수
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.188-190
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    • 2004

  • 가스메탈아크용접(gas metal arc welding, 이하 'GMA용접' 이라고 함)은 용가재로서 소모전극 와이어를 일정한 속도로 용융지에 공급하면서 와이어 선단과 모재 사이에서 전기적 아크가 발생되도록 하는 용접법이다. (중략)

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An extension of new laser pulse atom-probe construction and time-of-flight mass spectrum of $H_2$ and He gas (A new laser pulse atom-probe 제작 및 $H_2$ 가스와 He 가스의 time-of-flight mass spectrum)

  • 송순달;홍남관
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.7 no.3
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    • pp.465-472
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    • 1997

  • An extension of new test methods for surfaces with an apparatus based on photon-induced desorption and ionisation in the electric field, is constructed and tested, It also investigates how to show the efficiency of the arrangement adsorbates $H_2$ and He on W(110). The field emitter temperature was 80 K. The wavelength of light used was 193 nm with field strengths between 10 and 50 V/nm. Many ion fragments($CO^+, He^+, H_2^^+, H_2O^+, W^{3+}\; and\; W^{2+}$) were produced by an electronic stimulation of the adsorbate with the help of a photon energy of 6.4 eV at He and $H_2$/W(110). A transient recorder enables the registration of the entire mass spectrum.

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Structure of Tip Leakage Flow in a Forward-Swept Axial-Flow Fan (전향 스윕 축류형 팬에서의 팁 누설 유동 구조)

  • Lee, Gong-Hee;Baek, Je-Hyun
    • 유체기계공업학회:학술대회논문집
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    • 2002.12a
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    • pp.131-136
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    • 2002

  • A computational analysis using Reynolds stress model in FLUENT is conducted to give a clear understanding of the effect of blade loading on the structure of tip leakage flow in a forward-swept axial-flow fan at design condition ($\phi$=0.25) and off-design condition ($\phi$=0.21 and 0.30). The roll-up of tip leakage flow starts near the minimum static wall pressure position, and the tip leakage vortex developes along the centerline of the pressure trough within the blade passages. Near tip region, a reverse flow induced by tip leakage vortex has a blockage effect on the through-flow. As a result, high momentum region is observed below the tip leakage vortex. As the blade loading increases, the reverse flow region is more inclined toward circumferential direction and the onset position of the rolling-up of tip leakage flow moves upstream. Because the casing boundary layer becomes thicker, and the mixing between the through-flow and the leakage jet with the different flow direction is enforced, the streamwise vorticity decays more fast with blade loading increasing. The computational results show that a distinct tip leakage vortex is observed downstream of the blade trailing edge at $\phi$=0.30, but it is not observed at $\phi$=0.21 and 0.25.

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