The burner axis should be in a bottom plane of a crucible.
The burner should be established so that the flame does not flap directly in a crucible and bent it on tangent.
A gap between a crucible and a furnace cover should be insulated by thermoinsulating material.
Use only standard supports. Between crucible and support should be separating material: paper, coke, alumina.
For installation and extraction of crucibles tongs (claws) should be used. Tongs should correspond to the shape of crucible and be wrapped up with mild material.
In resistance ovens and induction furnaces air gap between crucible's edge and oven's cover should be sealed up by mixture on the ground of fireproof clay.
In resistance ovens and induction furnaces air gap between crucible's edge and oven's cover should be sealed up by mixture on the ground of fireproof clay.
It is forbidden categorically to warm up a crucible with metal stiffened in it. The hole for emergency output of molten metal in furnace should be closed.
Metal melting is necessary to conduct as soon as possible.
Don't leave empty crucible in the furnace between meltings. Period between meltings should be minimal.
It is necessary to change a level of melt in a crucible in order to avoid fretting of crucible walls by drosses on a “mirror” of metal.
Keep strictly to necessary quantity of chemical components for modification of alloys.
Enter the components only into molten metal.
After breaks in work (e.g. stops during weekends) it is necessary to warm up slowly the empty crucibles in the furnace regardless of its type.
In induction furnaces where heating and metal fusion occur at the expense of currents proceeding in it, and the crucible is heated from metal, it is recommended to increase gradually the energy to provide uniform heating of the crucible. The optimum decision in this case is the continuous operating mode.