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Friction melt bonding of galvanized steel with magnesium: process window, microstructure and mechanical properties

Rolland, Hugo
(2024)

Files

Rolland_65061800_2024.pdf
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Details

Supervisors
Simar, Aude
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil mécanicien, à finalité spécialisée
Abstract
The aim of this master thesis was to investigate the weldability of magnesium AZ31 to galvanized S235 steel joints through friction melt bonding. Initially, linear welds were performed. These enable to establish a process win- dow and to highlight the importance of certain parameters such as plate roughness, power input and tool wear. Further SEM analysis permitted to take a closer look at the microstructure of the interface layer formed or not between the two base materials. Then a process window was also proposed for spot welds. Mechanical tests were carried out to quantify the strength of the welds produced. On the basis of these tests and the analysis of the fracture surfaces of the samples, several fracture propagation modes were proposed. Finally, optical and electron microscopic analysis were used to study the potential appearance of an interface layer. Several EDX scans were then used to determine the composition of the latter.