Study on Surface and Microstructure of GHTA Welded 304 Steels under Simulated Space Environment in Flying Laboratory.

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  • 模擬宇宙環境下でＧＨＴＡ溶接されたステンレス鋼の表面および金属組織観察
  • モギ ウチュウ カンキョウ カ デ GHTA ヨウセツ サレタ ステンレス コウ ノ ヒョウメン オヨビ キンゾク ソシキ カンサツ

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Abstract

GHTA (Gas Hollow Tungsten Arc) welding experiments were performed under simulated space environment and various gravity conditions in a vacuum chamber using an aircraft. An experimental system for GHTA welding test was placed in the cabin of the aircraft and the 10-2G and 2 G gravity conditions were produced by a parabolic flight of the aircraft. Arc spot welding tests of 304 stainless steel plates and circumferential melt-run welding tests of 304 stainless steel pipes were conducted in a vacuum chamber under various conditions to investigate the influence of gravity on the welding phenomena such as arc discharge, melting and microstructure. The results are summarized as follows, (1) Although the microgravity condition makes the full penetration possible without hanging of weld metal, the investigations of arc spot welded zones by laser microscope make it clear that the gravity have no effect on surface properties such as minute rough of weld metals. The surface properties of circumferential melt-run welded zone are also independent of the gravity. (2) Microstructure and hardness of arc spot welded 304 stainless steel plates under simulated space environment are similar to those of welded plates with flat position under 1 G gravity in a vacuum. So it can be considered that there is no effect of the gravity. (3) Melt-run welding experiments with flat position under various gravity conditions make it clear that microstructure and hardness distribution in weld metals of 304 stainless steel pipes are also not affected very much by the gravity conditions.

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