GHTA Welding Phenomena of an Aluminum Alloy in Vacuum

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  • アルミニウム合金の真空中でのＧＨＴＡ溶接現象
  • アルミニウム ゴウキン ノ シンクウ チュウ デ ノ GHTA ヨウセツ ゲンショウ

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Abstract

Aluminum alloys that have high specific strengths have been widely used in constructing various space structures including the International Space Station (ISS) and launch vehicles. Considering space applications, a series of welding experiments were performed in vacuum on an aluminum alloy using the GHTA (Gas Hollow Tungsten Arc) welding processes under d. c., a. c., and d. c. - pulsed conditions. Results observed in the GHTA welding experiments performed in vacuum can be summarized as follows:<br> (1) When GHTA welding was performed using a commercial a. c. welding machine, the arc discharge did not occur during the electrode positive polarity of alternating current. As a result, it was not possible to remove oxide films from the specimen surface resulting in the cleaning action.<br> (2) During the d. c. - pulsed GHTA process, it was possible to mechanically shatter and remove the oxide films covering the molten pool by the impact of the arc force.<br> (3) A study has been made to determine effects of pulse current during the d. c. pulse welding on characteristics of melting and bead appearances during the d. c. - pulsed GHTA welding.<br> The above-mentioned results show that welding phenomena observed in the experiments performed under vacuum conditions were very different from those observed in the experiments performed in the air.<br>

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