ＡＣ３ＡおよびＡＣ７Ｂ合金のＴＩＧ溶接継手の組織と機械的性質

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書誌事項

タイトル別名
  • Structures and mechanical properties of TIG weld joints of AC3A and AC7B castings
  • AC3A オヨビ AC7B ゴウキン ノ TIG ヨウセツ ツギテ ノ ソシキ

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説明

A weldability test on AC3A (Al-12.5%Si) and AC7B (Al-10%Mg) castings was carried out using 4043 alloy of a filler metal. The weld heat input has little effect on the Na-modified eutectiic structure and impact strength of AC3A. The weld metal having refined eutectic and α-dendritic structures has impact strength twice as high as the modified base metals. The weld joint of AC7B-F castings is remarkably brittle. Toe-cracking often occurs at a heavy heat input. The impact strength of AC7B-T4 weld joints drops in the heat affected zone where grain boundary precipitation occurs considerably. Such a decrease in ductility is attributed not to the precipitation but to GP zone formation accelerated by cyclic heat input.

収録刊行物

  • 軽金属

    軽金属 33 (4), 195-203, 1983

    一般社団法人 軽金属学会

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