Wire and arc additive manufactured Ti–6Al–4V/Al–6.25Cu dissimilar alloys by CMT-welding: effect of deposition order on reaction layer

ABSTRACT

Components of Ti–6Al–4 V/Al–6.25Cu dissimilar alloys were manufactured via wire and arc additive manufacturing (WAAM) using cold metal transfer (CMT) technology. Additive manufactured components were obtained irrespective of the deposition order. When the Ti alloy was deposited first, brazing joining occurred between the Ti and Al alloys and TiAl₃ formed in the reaction layer. Otherwise, fusion joining occurred, and TiAl₃, TiAl, and Ti₃Al formed in a thicker reaction layer. The average tensile strengths of the samples obtained by depositing the Ti or Al alloys first were 108 and 30 MPa, respectively. Brittle fracture occurred in all samples. Depositing the Ti alloy first was found to be more suitable for the CMT-based WAAM of Ti/Al dissimilar alloys.

KEYWORDS:

• Ti/Al dissimilar alloys
• wire and arc additive manufacturing
• cold metal transfer
• reaction layer
• microstructure
• mechanical property

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Junqi Shen http://orcid.org/0000-0002-4771-4575

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (grant number 51575381), the Tianjin Science and Technology Commission (grant number 15JCZDJC38600), and the China Scholarship Council (grant numbers 201706255090 and 201806250043).