Home FOR AUTHORS Kovove Materialy-Metallic Materials 2021 Kovove Materialy-Metallic Materials Vol. 59 (2021), no. 2, pp.131–139

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Kovove Materialy-Metallic Materials Vol. 59 (2021), no. 2, pp.131–139

Title: Interfacial microstructure and fractography of Ti6Al4V/5A05Al dissimilar joint using the cold arc MIG welding
Author: S. Wei, W. Rao
Abstract: Titanium Ti6Al4V and aluminum 5A05Al were cold arc MIG welded using Al-Si5 filler. The feasibility of Ti/Al dissimilar cold arc MIG welding-brazing was investigated by microstructure examination and fractography. Welds without defects were fabricated; however, the Ti/Al interface exhibited non-uniform structures. A multilayered structure, including an α -Ti layer, a TiAl3 + Ti5Si3 mixed layer, and a serrate TiAl3 layer, was observed in the upper regions. In comparison, only a thin cellular TiAl3 layer was observed in other regions. Two types of fracture modes, including a ductile fracture mode and a mixed brittle-ductile fracture mode, were observed in a single joint. The ultimate tensile strength of the Ti/Al joints surpassed 240 MPa.
Keywords: dissimilar joining, cold arc welding, welding-brazing, microstructure, fractography
Published online: 13-May-2021
Year: 2021, Volume: 59, Issue: 2 Page From: 131, Page To: 139
doi:10.4149/km_2021_2_131
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