Examination of the Weld Brazed Joints of Steel and Aluminium Thin Plates

Nagy, Dániel and Katula, Levente Tamás (2024) Examination of the Weld Brazed Joints of Steel and Aluminium Thin Plates. ACTA MATERIALIA TRANSYLVANICA (EN), 7 (2). pp. 94-99. ISSN 2601-8799

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Abstract

In our research, overlapped thin sheets of hot-dip galvanized steel and aluminum alloy were bonded bybraze welding, for which we used the CMT (Cold Metal Trasnfer) sub-versions of the welding manufacturerFronius. The settings of the welding parameters were based on the smallest possible heat input and thethickness of the zinc layer. Cohesive bonds on the aluminum side and adhesive bonds on the coated steelside were subjected to metallographic test and the composition and distribution of the resulting intermetallic compounds were determined with the help of literature sources. Based on visual inspection, aestheticand well reproduciable joints were formed, but large amounts and sizes of porosites were formed on thecross-sectional grinds due to the burning of the zinc layer. We also deduced the strength characteristics of thejoints from the shear-tensile tests and the fracture surfaces. The fracture of the test specimens occurred at thejunction of the weld metal and the alumnium base material.

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