I want to design the inductor for brazing the copper flats of 7.5mm thickness. The copper flat is to be joined by using phosphorous strip as a flux.Please suggest.
You can't use an inductor for brazing. Perhaps you mean transformer.
An induction furnace uses induction to heat metal to its melting point. Once molten, the high-frequency magnetic field can also be used to stir the hot metal, which is useful in ensuring that alloying additions are fully mixed into the melt. Most induction furnaces consist of a tube of water-cooled copper rings surrounding a container of refractory material. Induction furnaces are used in most modern foundries as a cleaner method of melting metals than a reverberatory furnace or a cupola. Sizes range from a kilogram of capacity to a hundred tonnes capacity. Induction furnaces often emit a high-pitched whine or hum when they are running, depending on their operating frequency. Metals melted include iron and steel, copper, aluminium, and precious metals. Because it is a clean and non-contact process it can be used in a vacuum or inert atmosphere. Vacuum furnaces make use of induction heating for the production of specialty steels and other alloys that would oxidize if heated in the presence of air.
I assume you mean an induction heating coil. This is certainly possible. Induction heating will, theoretically, heat anything that conducts electricity (with the obvious exception of a superconductor since superconductors have zero electrical resistance). The design of induction coils is, as they say, non-trivial. It becomes much more non-trivial if you start worrying about energy efficiency, heating rate, temperature control, safety, etc. There are many more ways to do this wrong than to do it right. The first issue is the power supply, what is the frequency, what is the power, what is the coil voltage, etc. Another issue is the geometry of the piece to be heated. I recommend you contact someone who designs and builds induction heating equipment for a living. Inductotherm has an excellent reputation for technical expertise, many many years of proven designs, high reliability, top notch field service, and they price their equipment accordingly. There are many other suppliers to choose from. On the other hand, you could reinvent the wheel and see how that turns out.
