溶体化時効処理 Ti-6Al-4V 合金の電子ビーム溶接継手特性(<特集>チタンおよびチタン合金)

概要

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The influence of the electron beam welding conditions on the mechanical properties of the welded joint in a solution treated and aged Ti-6Al-4V alloy having a tensile strength of 115 kgf/mm^2 has been studied. The strength of welded joint is equal to that of base metal below the welding heat input of 6600J/cm. Above this heat input, the strength of the joint is lower than that of base metal, but the strength is not reduced lower than 110 kgf/mm^2 in the highest heat input studied. The decrease in the strength of the joint is a result of the decrease of the strength of weld metal, which decreases gradually with the increase in the heat input. As the heat input decreases, the toughness and ductility in weld metal slightly decrease, but the fracture toughness is higher than that of base metal even in the lowest heat input studied. In conclusion, it was found that the solution treated and aged Ti-6Al-4V alloy had the good electron beam weldability.
社団法人日本鉄鋼協会の論文
1986-04-01