0602223 - ÚACH 2025 RIV CH eng J - Journal Article
Marônek, M. - Bárta, J. - Bártová, K. - Sahul, M. - Sahul, M. - Pašák, M. - Nesvadba, P. - Bezdička, Petr
Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers.
Crystals. Roč. 14, č. 11 (2024), č. článku 974. ISSN 2073-4352. E-ISSN 2073-4352
R&D Projects: GA MŠMT(CZ) LM2023066
Institutional support: RVO:61388980
Keywords : explosion welding * copper * aluminium * aluminium alloy * intermetallic phase * trimetal
OECD category: Inorganic and nuclear chemistry
Impact factor: 2.4, year: 2023 ; AIS: 0.394, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.3390/cryst14110974

The paper deals with the evaluation of the quality of Cu-Al-AlMg3 structural transition joints (STJ) made by explosion welding proposed for the renovation of galvanizer hangers. The threelayer joint consisted of electrolytic copper with a thickness of 25 mm, 2 mm of aluminium represented
by the AW1050 alloy, and 25 mm of the EN AW 575 aluminium alloy. Light microscopy analysis confirmed the wavy pattern of both interfaces of the welded joint and significant plastic deformation in close proximity to the waves. Microhardness measurement revealed a partial strain hardening of
the AW5754 copper-aluminium alloy near the interface and a significant increase in microhardness in the vortex zone of waves, reaching a value of up to 863 HV 0.025. Microcracks were also observed in these places. The intermetallic phase Al2Cu was identified in the vortex zones by XRD analysis.
As a continuous layer of intermetallic phase was not observed in the interface of the welded joint, it is possible to consider the used welding parameters as appropriate. A semi-quantitative EDX analysis revealed a diversity of chemical composition in the vortex zones, which does not correspond to the phase composition based on the equilibrium binary Al-Cu diagram due to non-equilibrium conditions in the formation of the welded joint interface. The bond strength of three-layer welded joint evaluated by the strength test ranged from 151 to 171 MPa, which represented approximately a two-fold increase in comparison to the ultimate tensile strength of alloy AW1050, while the failure occurred in all samples at the AW1050-AW5754 alloy interface.
Permanent Link: https://hdl.handle.net/11104/0359401