In the investment casting process, obtaining inclusion free castings requires clean alloy. Besides starting with clean alloy, it must be kept clean during melting and transferring to the mold. The presentation reviews some of the important factors that need to be considered in order to establish equipment and good induction melting practices. The areas discussed include melt refractory interactions, induction melting crucible materials and preparation, and remelt process control.

Induction remelting of alloys in refractory crucibles is widely used in investment casting because it can offer the following advantages:

• Applicable to a wide variety of alloys and batch sizes.

• Applicable for both vacuum and air melting and casting processes.

• Ease of maintaining tight compositional control tolerances, and control of reactive elements.

• Rapid and controlled remelting cycle

• Availability of a variety of commercial equipment.

In the investment casting process, obtaining inclusion free castings requires clean alloy. Besides starting with clean alloy, keeping it clean during melting and transferring to the mold requires good induction melting equipment and practices. This presentation will review some of the important factors that need to be considered in order to establish good induction melting practices. The topics discussed will include melt refractory interactions, induction melting crucible materials and preparation, and remelt process control.