赤外線二色放射測温法による溶融池表面温度測定 The Surface Temperature Measurement of Weld Pool by Infrared Two-Color Pyrometry

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In this research, two-color pyrometry has been conducted to obtain the surface temperature of the weld pool, in which the weld pool is photographed by a high speed camera during arc welding. Two wave-lengths (950 and 980 nm) of light in the infrared range were selected from the thermal radiation light emitted from the weld pool at the instant when the arc was extinguished, by using an imaging spectroscope. The temperature is obtained from the intensity ratio of two waves of light. Consequently, in GTA welding, it is shown that the surface temperature distribution of a weld pool is affected by the sulfur content in the base metal. It is thought that this surface temperature distribution is determined by the balance between the driving forces of viscous drag from the cathode jet of plasma and Marangoni surface tension. In GMA welding, it is seen that the surface temperature distribution of a weld pool becomes uniform and the temperature is 1715–1845K, which is obviously lower than that of the metal droplet. For this reason, it is considered that the convection velocity on the weld pool surface and in the weld pool is high and, consequently, the heat input from the arc is transported to the back of the weld pool due to this convection. It is supposed that the edge of the pool below the arc has a high temperature compared with the central part of it due to the influence of high speed convection.

収録刊行物

  • 溶接学会論文集 : quarterly journal of the Japan Welding Society

    溶接学会論文集 : quarterly journal of the Japan Welding Society 27(1), 34-40, 2010-01-20

    一般社団法人 溶接学会

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各種コード

  • NII論文ID(NAID)
    10030148529
  • NII書誌ID(NCID)
    AN1005067X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    02884771
  • データ提供元
    CJP書誌  J-STAGE 
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