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Microstructure and joining mechanism of Ti/Al dissimilar joint by pulsed gas metal arc welding

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Abstract

Butt joining of titanium alloy Ti–2Al–Mn to aluminum 1060 using AlSi5 filler wire was conducted using pulsed gas metal arc welding. Joining mechanism of Ti–2Al–Mn/Al 1060 dissimilar joint with different welding heat input was investigated. Formations of precipitation and Ti/Al interface were discussed in detail. Fusion zone near aluminum is composed of α-Al dendrites and Al–Si hypoeutectic structures. A few TiAl3 precipitations appear in the weld metal owing to metallurgical reactions of Al with dissolved Ti. When the welding heat input was in the range of 1.87–2.10 kJ/cm, titanium alloy Ti–2Al–Mn and Al 1060 were joined together by the formation of a complex Ti/Al interface. With a low welding heat input, a serrate TiAl3 interfacial reaction layer was formed near Ti/Al interface. With the increasing of the welding heat input, α-Ti, Ti7Al5Si12, and TiAl3 layers were formed orderly from Ti–2Al–Mn to weld metal.

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Correspondence to Li Yajiang.

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Shouzheng, W., Yajiang, L., Juan, W. et al. Microstructure and joining mechanism of Ti/Al dissimilar joint by pulsed gas metal arc welding. Int J Adv Manuf Technol 70, 1137–1142 (2014). https://doi.org/10.1007/s00170-013-5290-5

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  • DOI: https://doi.org/10.1007/s00170-013-5290-5

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