Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers
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 three-layer joint consisted of electrolytic copper with a thickness of 25 mm, 2 mm of aluminium represented by the AW1...
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MDPI AG
2024-11-01
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| author | Milan Marônek Jozef Bárta Katarína Bártová Miroslav Sahul Martin Sahul Matej Pašák Petr Nesvadba Petr Bezdička |
| author_facet | Milan Marônek Jozef Bárta Katarína Bártová Miroslav Sahul Martin Sahul Matej Pašák Petr Nesvadba Petr Bezdička |
| author_sort | Milan Marônek |
| collection | DOAJ |
| description | 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 three-layer 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 Al<sub>2</sub>Cu 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. |
| format | Article |
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| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj-art-313ba8ceca244c3db08cb29ff9b39f432025-08-20T01:53:44ZengMDPI AGCrystals2073-43522024-11-01141197410.3390/cryst14110974Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer HangersMilan Marônek0Jozef Bárta1Katarína Bártová2Miroslav Sahul3Martin Sahul4Matej Pašák5Petr Nesvadba6Petr Bezdička7Faculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, SlovakiaFaculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, SlovakiaFaculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, SlovakiaFaculty of Mechanical Engineering, Czech Technical University in Prague, Technická 4, 166 07 Dejvice, Czech RepublicFaculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, SlovakiaFaculty of Materials Science and Technology, Slovak University of Technology, J. Bottu 25, 917 24 Trnava, SlovakiaBBP Technologie, s.r.o., Na Vysluni 114, 533 52 Srch, Czech RepublicInstitute of Inorganic Chemistry of the Czech Academy of Sciences, Řež 1001, 250 68 Husinec-Rez, Czech RepublicThe 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 three-layer 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 Al<sub>2</sub>Cu 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.https://www.mdpi.com/2073-4352/14/11/974explosion weldingcopperaluminiumaluminium alloyintermetallic phasetrimetal |
| spellingShingle | Milan Marônek Jozef Bárta Katarína Bártová Miroslav Sahul Martin Sahul Matej Pašák Petr Nesvadba Petr Bezdička Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers Crystals explosion welding copper aluminium aluminium alloy intermetallic phase trimetal |
| title | Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers |
| title_full | Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers |
| title_fullStr | Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers |
| title_full_unstemmed | Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers |
| title_short | Evaluation of Structural Transition Joints Cu-Al-AlMg3 Used in Galvanizer Hangers |
| title_sort | evaluation of structural transition joints cu al almg3 used in galvanizer hangers |
| topic | explosion welding copper aluminium aluminium alloy intermetallic phase trimetal |
| url | https://www.mdpi.com/2073-4352/14/11/974 |
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