It is the aim of the present study to determine a suitable joining technology and especially a convenient filler metal for the increased use of magnesium-alloy plates, i.e. AZ31B in the automotive sector. This includes that the contact corrosion has to be minimized, the joining temperature must be lower than the critical temperature of the basic material (liquidus temperature <450 deg C) and a third element besides Mg and Al has to be integrated to build a ternary eutectic. Various filler metals of selected ternary eutectics (Mg-Al-Ag, Mg-Al-Zn, Mg-Al-Sn, Mg-Al-Cu, Mg-Al-Ga) were tested together with the basic properties of various fluxes on AZ31 with view on liquidus temperature, wetting behavior and reduction of the oxide skin. The wetting behavior and the reduction of the oxide skin were classified qualitatively. The promising combinations were used to produce lap joints and to measure basic mechanical properties. The most important demand on a suitable filler metal is to fulfill corrosion requirements. First tests in water and in NaCl-solution show that the base material is much more attacked than the joining zone. These first indications have to be analyzed in more details before bringing this category of filler metals onto the market. To achieve this, future investigations have to focus on quaternal alloy systems.
Development of magnesium-based filler metals
2006
3 Seiten, 3 Bilder, 3 Tabellen, 5 Quellen
Conference paper
English
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