Patent ID: 8746322

Claim:
A method of producing bimetallic and multilayer casts by gravity or spun casting, comprising: providing a mould having a mould cavity; sequentially casting at least two different metal materials in the mould by pouring in the mould cavity a first molten material and then pouring in the mould cavity a second molten material over the first molten material; and feeding from a burner a flame of aflame hydrogen gas into the mould cavity at least before the starting of the pouring of the second molten material in the mould cavity, the aflame hydrogen gas passing through the mould cavity to consume all oxygen in the mould and then escaping to further burn in a free space above the mould; wherein the burner is inserted into the mould cavity and the flame is fed into the mould cavity to consume all the oxygen in the mould cavity, and the flame is continuously fed into the mould cavity after pouring in the first molten material at least until the second molten material is poured into the mould cavity, wherein the second molten material is poured after a time delay to allow for realization of a solidified coating in the first molten material while the flame is fed into the mould, and wherein the burner comprises a tube and the aflame hydrogen is fed through the tube.