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4GSR
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Induction heating will not heat up copper or brass by itself. But when combined with steel, like induction brazing, the steel will melt the copper or brass and make it flow creating a perfect brazed joint.If the video color is accurate that should be copper or bronze. The radiant color at the melting point looks to be in the ballpark of 1800-2000 deg. If that were steel it would be blinding white. Great video!
Robert
I've seen this induction process used to heat up big chunks of steel, say 8' diameter solid by up to 18" long to near its melting point. Material is then transferred up into a upsetter and smashed into a shape. To heat up a large solid chunk of iron, it uses a low cycle of eddy current at several thousands of amps pushed through the copper coils. The coils are hollow and chilled water is passed thru to keep the coils from totally melting into a blob of molted metal on the floor. One induction coil or I should say a series of coils require about enough power to light up a small neighborhood! Kid you not!
On the smaller scale, I've used it for surface hardening or case hardening of steel and cast iron. Generally leaves a case depth of about .035-.045" deep and a hardness of 55-62 HRC. The coils run on a high frequency of around 25-35,000 cycles and lots of amps of power.