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I want to design/buy circuit which will give O/p of 20000 amps to 40000 Amps. Answered

I need to melt a piece of metal (10 mm x 15 mm) within few seconds to few minutes using resistance heating.I should be able vary current o/p digitally so that I can vary time to heat the sample.  How to do this?

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iceng

3 years ago

Only two dimensions indicates A metal foil which will burn up ( oxidize ) unless done in a reducing atmosphere with just milliamps of current.

But your question is lacking a basic understanding and leaves the implied grandiose star building intentions.

So we assume a 10 foot long 10mm x 15mm iron bar.. Note how that furnace you can rent and will melt your bar. You don't say how much metal volume to melt either which makes it hard to design a resistance melter.. Then again an Al bar would be even more difficult to build a resistance heating melter.

Where did you learn about resistance welding (melting wont work because the contact pressure cannot be applied to a plastic metal ) and those abnormally high currents ??

arcfurnace.png
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vikmuliceng

Answer 3 years ago

Sorry ... not mentioned size of sample .It's 10 mm X 15 mm X 10 mm. So its a small piece. still you think I can not do it?

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Downunder35mvikmul

Answer 3 years ago

A good kiln will do that with no problem.
But doing this by resistive heating is a useless task.

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271828-

3 years ago

Variac on the input (for control) of a large transformer with only a few turns of huge wire on the output, like this YouTube video


You should follow the videos advice and not try it yourself

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steveastrouk

3 years ago

so a better question is 'how can I melt a very small piece of iron' ?

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vikmuliceng

Answer 3 years ago

Thanks for sharing!!!!

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Josehf Murchison

3 years ago

OK I rarely say this but if you need to ask us you can't do it.

You are talking the power of a foundry furnace or enough power to run a small city.

Do you have access to a megawatt generator?

Because if you don't, you just don't have the power.

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rickharrisJosehf Murchison

Answer 3 years ago

20 Kilamps! Nope as Josehf says if you have to ask your not ready.

Sorry.

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rickharrisrickharris

Answer 3 years ago

Perhaps you mean 2000 amps, On what are you basing your current calculations?

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petercd

3 years ago

Most lightning measurements have been in the range 5,000 to 20,000 amps, so a kite in a lightning strom is out of the question.

How close are you to a nuclear power station?

Maybe you can negotiate a bulk buy from them.