Casting of a clad strip consisting of AM60 and AZ121 magnesium alloy was tried using an equal diameter twin roll caster with a scraper. The casting speed was 30 m/min and casting was conducted in the oxidizing atmosphere. The AM60 strip was cast using a scraper, and the molten metal of the AZ121 was poured on the scribed AM60 surface. The two-layer clad strip could be cast by one caster. The two layers were bonded strongly at the interface. The interface was clear. It was estimated that the AM60 was not melted by the molten metal of the AZ121.
A single-roll caster equipped with two scrapers and an unequal-diameter twin-roll caster equipped with two scrapers are proposed for casting clad strip without centerline porosity. Although usually found in roll cast 5182 strip, no centerline porosity occurred in the 5182 strip, which was cast by the unequal-diameter twin-roll caster equipped with two scrapers. The interface between the 5182 strips and the 3003 base strip was clear. Both roll casters could cast the clad strip at 30 m/min.