Welding Experiments of Aluminum Alloy by Space GHTA Welding at ISS Orbital Pressure

  • SUITA Yoshikazu
    Department of Electro-Mechanical Systems Engineering, Takamatsu National College of Technology
  • TAKAI Daisuke
    Advanced Course of Mechanical Electrical Systems Engineering, Takamatsu National College of Technology
  • SUGIYAMA Satoshi
    Advanced Course of Mechanical Electrical Systems Engineering, Takamatsu National College of Technology
  • TERAJIMA Noboru
    Department of Electro-Mechanical Systems Engineering, Takamatsu National College of Technology
  • TSUKUDA Yoshiyuki
    Department of Electro-Mechanical Systems Engineering, Takamatsu National College of Technology
  • FUJISAWA Shoichiro
    Department of Electro-Mechanical Systems Engineering, Takamatsu National College of Technology
  • IMAGAWA Kichiro
    Japan Aerospace Exploration Agency

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抄録

As a feasible welding method in space, the authors previously proposed the space GHTA (Gas Hollow Tungsten Arc) welding process. However, space GHTA welding with a high-frequency device for arc start may cause electromagnetic noise problems for the computer equipment placed on the ISS (International Space Station). Therefore, in this report, welding experiments of space GHTA welding using aluminum alloy with a high-voltage DC device for arc start were carried out at the ISS orbital pressure, 10−5 Pa. It is clear from the experiments using a high-voltage DC device in a high-vacuum condition, that there is a shifting phenomenon in which the spark discharge shifts to either a glow discharge or an arc discharge when starting the arc. Welding projects in space need an arc discharge, so we investigated the effects of welding parameters on the arc formation ratio. As a result, space GHTA welding with a high-voltage DC device can be used for arc start when welding at the ISS orbital pressure.

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