Optimal values for power in an induction heater?

[Shadow89]

I really want to build a simple but powerful induction heater for hobby blacksmithing.
Metal shaping and the design of the cooling system within the coils are not a problem.
I need help understanding the electronics

Obviously I must first use a transformer as a safety against "backlash" to the grid and my house. So I might as well change the amount of current and voltage.

1st question: What are the optimal values for both voltage and current? Let's say I want to heat a 250mm long steel bar, roughly 25mmx25mm cross section. I need 1300 degrees celsius or more.
Max. amp at the wall: 16A. 220V to 230V
(Should I max out the voltage or the current? same as in the wall? etc.)

2nd. question: What is the optimal frequency on the AC for such a device? Does it change a lot based on the shape/size of the bar? (materials?) Is there a safe/reasonable/affordable way to modulate frequency for a layman like myself? It would be nice if I could set it and forget it. The size of the coil is finite anyway.

3rd. question: If i manage to install three-phase power in my house, does that change any of the other answers?

4th. question: Are there any other electric properties I have not considered, which are important to get this to work properly?

 

[berkeman]

Thread closed for Moderation...

 

[berkeman]

I really want to build a simple but powerful induction heater for hobby blacksmithing.

1st question: What are the optimal values for both voltage and current? Let's say I want to heat a 250mm long steel bar, roughly 25mmx25mm cross section. I need 1300 degrees celsius or more.
Max. amp at the wall: 16A. 220V to 230V
(Should I max out the voltage or the current? same as in the wall? etc.)

Obviously I must first use a transformer as a safety against "backlash" to the grid and my house. So I might as well change the amount of current and voltage.

These questions show pretty clearly that you need to find a local Mentor to help you with this project. Preferably one who is familiar with your local building electrical codes, and can help you through the building permits and inspections associated with this. If you can stay within the existing electrical distribution panel ratings for you workshop, you may not need any additional building permits, but your local Mentor should be able to help you avoid fires and such.

Thread will stay closed. Please be safe.