I am working on determining the specs needed for an induction heater I plan on buying or building. However, I’m having trouble calculating the potential current draw and wattage needed for my application.
The use will be for brazing copper to brass with silver solder. The melting point is around 1200 F. The copper is a 3” diameter hollow pipe with about 0.079 wall thickness. And the brass is about 0.5” thick and a 5” diameter.
I understand the resistivity of copper to be 1.7*10^-8. But with that value I am coming with extremely small numbers for resistance of my target hearing area and it just doesn’t seem correct.
How can I accurately determine my power and current needs for this application. The plan is to use 48VDC supply but that can be changed.