Structures and mechanical properties of TIG weld joints of AC3A and AC7B castings

DOI Web Site

Bibliographic Information

Other Title
  • ＡＣ３ＡおよびＡＣ７Ｂ合金のＴＩＧ溶接継手の組織と機械的性質
  • AC3A オヨビ AC7B ゴウキン ノ TIG ヨウセツ ツギテ ノ ソシキ

Search this article

Description

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.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top