Look how much power it takes to (heat and) blow the tiny piece of wire in a fuse then mentally imagine the amount of power it will take to heat the foot-long and (bit over) half-inch rod you want to heat.
The power required will be very high and will depend on the time allowed for heating and the required rod temperature.
Perhaps GOOGLE 'induction heating' as an industrial process - it is one method and is rather complex.
If you explain what you are actually trying to do there may be alternatives.
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