Recommended Metal Melting Practice

1 Charge only clean, dry ingot or back scrap. The
presence of moisture or organic materials may cause gas in the metal after it is molten.
2 Use a clean crucible or a furnace in good condition to help avoid chemical contamination of tile alloy.
3 Melt as quickly as possible in an oxidizing atmos­phere. This mean; there should be a slight amount of oxygen in the products of combustion. A sharp, green flame over tbe furnace in fuel-fired melting usually indicates this condition.
4 Do not overheat the metal. Superheat only as much
as needed to take the metal from the furnace, handle it, and pour it into the mold at the best pouring temperature.
5 After the metal is taken from the furnace, skim it carefully without stirring or agitation. Measure the temperature, and when it has reached a suit­able point, add the necessary deoxidizer and pour the castings.