Aluminium alloys are notoriously difficult materials to cast or weld. Their naturally high reactivity with the environment favours oxidation and moisture pick up that promotes pores formation during solidification. Among other mechanisms, gas porosity need to be addressed. In casting, this can be done by adjusting the cooling rate [1]. In welding, it can be done by scanning the surface [2]. This post addresses a few ways to decrease hydrogen porosity formed during Selective Laser Melting.
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