member 2 is removed and the various metals to be mixed together at raised temperature to obtain a homogeneous alloy are introduced into the furnace 1 the various metal particles collect in the branch 1c the closure member 2 is then replaced and the tube 4 and the pipe 6 connected up the interior part of the tube 4 is angled so that its outlet is at the inlet of the branch 1c the branch 1c is then heated to a temperature sufficient to melt the metals that it contains the melting temperature being regulated by the sensor 11 and apparatus that is not shown when the metals have been reduced to a liquid the stirrer 10 is operated to homogenize the mixture melting occurs in a reducing atmosphere because hydrogen from the storage tank 8 is blown into the furnace 1 from which it escapes via the pipe 6 when the molten alloy is at the correct temperature and perfectly homogenized the furnace is tilted counter clockwise until the molten alloy 13 flows into the branch 1e of the furnace 1 which constitutes an ingot mold heating of the branch 1c is then stopped so that the liquid alloy in the ingot mold 1e cools and forms an ingot 14 the solidified ingot is removed from the ingot mold after removing the end plate 12 as shown in dashed and chain dotted outline in fig1 note that the pouring of the liquid and the cooling of the ingot take place in a reducing.