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Study on Microstructure and Properties of K-TIG Welded Joint of 95 mm Ti-6Al-4V Thick Plate
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Study on Microstructure and Properties of K-TIG Welded Joint of 95 mm Ti-6Al-4V Thick Plate
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Journal Article
Study on Microstructure and Properties of K-TIG Welded Joint of 95 mm Ti-6Al-4V Thick Plate
2025
Overview
This study investigates the application of the Keyhole–Tungsten Inert Gas Welding (K-TIG) hot-wire filling welding technique with mechanical arc oscillation to weld a 95 mm-thick Ti-6Al-4V titanium alloy plate. The root layer thickness achieved with this technique reaches up to 17 mm, with an average filling thickness of 2.5 mm. The weld bead displays a smooth, shiny appearance, and no significant welding defects are observed in the cross-section of the welded joint. Experimental results show that the welded joint consists of the α phase in different forms, as well as fine α+β microstructures. Compared to the base material, both the weld metal and the heat-affected zone exhibit a lower crystallographic texture strength, with more complex texture types. The impact toughness of the welded joint is excellent, with no significant weaknesses. The impact toughness of the weld metal significantly surpasses that of both the base material and the heat-affected zone. The engagement strengthening effect induced by high-current filling plays a crucial role in enhancing the impact toughness of the weld metal.
