Home Metallic Materials - Kovové materiály 2014 Metallic Materials Vol. 52 (2014), no. 5, pp.305-311

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Metallic Materials Vol. 52 (2014), no. 5, pp.305-311

Title: Microstructure characteristics of Ti-2Al-Mn/Al 1060 dissimilar joint by pulsed gas metal arc welding-brazing
Author: S. WEI, Y. LI, J. WANG, K. LIU, P. ZHANG

Abstract: Butt welding-brazing of titanium alloy Ti-2Al-Mn to aluminum 1060 plates was investigated by pulsed gas metal arc welding using an AlSi5 filler wire. Microstructure characteristics of Ti/Al dissimilar joint were observed by scanning electron microscope. Chemical composition and phase constituent of Ti-Al transition region were investigated using energy-dispersive spectrometer and X-ray diffraction. Micro-hardness distribution of the weld zone was tested by micro-sclerometer. The experiment results indicated that joint free of pores and cracks could be obtained by controlling the welding process. The weld metal was composed of α-Al dendrites and α-Al+Si eutectic phase. The intermetallic compound TiAl3 appeared in the weld metal. A multilayered Ti-Al transition region containing TiAl3, Ti7Al5Si12 and α-Ti had formed adjacent to the Ti/Al interface. Micro-hardness of the transition region was about 280HV0.05. The heat-affected zone of Ti-2Al-Mn alloy was mainly composed of acicular α′ and lath α′ martensite phases. Micro-hardness of the heat-affected zone was 220–270HV0.05.

Keywords: Ti-2Al-Mn alloy, Al 1060, pulsed gas metal arc welding, microstructure, micro-hardness
Year: 2014, Volume: 52, Issue: 5 Page From: 305, Page To: 311
doi:10.4149/km_2014_5_305


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