Al-Cu based welding wire with minor Sc-Zr alloying and its application

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ÂÛÎÄ×÷ÕߣºÒüÖ¾Ãñ ¹ù·ÉÔ¾ ÅËÇàÁÖ ËÎÁ·Åô

ÎÄÕÂÒ³Â룺781 - 784

Key words£º2195 aluminum alloy; Sc; welding joint; microstructure; mechanical properties

Abstract: A kind of Al-Cu-(Sc, Zr, Mn, Ti, V, B) welding wire was developed by adding minor Sc, Zr, Mn, V, B, and was used for welding 2195 aluminum alloy plate with a thickness of 2¤@mm. Mechanical properties and microstructure of welding wire and welding joint were studied. The results show that strength coefficient of the welding joint is 0.70 and the weakest area lies in the softened zone of HAZ. It is indicated that this welding wire adding minor Sc, Zr, Mn, V, B is an ideal welding wire for 2195 Al-Li alloy plate. The high strength of the weld comes from grain-refining strengthening and precipitation strengthening of Al₂Cu, Al₃Sc and Al₃Zr.