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Metal Casting Technologies : September 2007
TECHNICAL FEATURE www.metals.rala.com.au electrode. The cooling water flow rates for mould and base were 35 litres per min (lpm) and 25 lpm. The outlet water temperature from mould was about 400C. Figure 3 shows the ESR electrode and starting block. Figure 4 shows the ESR operation. Figure 5 shows the close up of ESR melting operation. The metal from electrode tip melts and pass through the molten slag layer and solidifies on the starting block. Slag rises above the metal as the slag density is lighter than molten steel density. At the end of the process power is reduced. The ESR ingot is stripped from the mould later and analyzed for chemical composition. Figure 3. ESR electrode and starting block Figure 4. ESR operation Figure 5. Close up of ESR melting operation 70