78Views8Replies

Author Options:

Required voltage and current for Knathal wire? Answered

Hi, i want to heat a Tungsten rod by using the Kanthal Wire(36 Awg). I want to know what is the required voltage and current to reach the 1300 deg Celsius. I am planned to make the constant current (like 3 amp) and increase the voltage.
So help me to control the temperature at 900 to 1300 deg by changing the power supply.

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
Downunder35m
Downunder35m

Best Answer 5 years ago

Easiest way is to use a temp controller ;)
Otherwise you risk to burn out the wire as you have no real temp control.
Calculating the required length or current / voltage is not enough as it also depends on how the wire is wound.

0
Gnanak
Gnanak

Answer 5 years ago

i want to wind without gap.

0
Downunder35m
Downunder35m

Answer 5 years ago

That means each turn touches the next and the only thing you produced is a short circuit.
Do yourself a favour and get a temp controller.
On Ebay you get them with PID contorl and SSR for under 50 bucks.

0
steveastrouk
steveastrouk

5 years ago

Me, I'd pass a huge current straight down the tungsten to heat it, in an inert atmosphere, or it will oxidise and burn out.

0
rickharris
rickharris

5 years ago

Not all all sure this is a good way to get Tungsten rod up to 1300 deg C though. Your insulation will have to be exceedingly good to reduce heat loss to almost zero.

0
Downunder35m
Downunder35m

Answer 5 years ago

IMHO the only way of properly doing it is inside a kiln.
Quickly made from some oven bricks with an added temp controller and all is good.
However standard Kanthal wire is only good for a max of 1300°C, Kanthal A-1 up to 1400.
Even inside a proper kiln I would not expext the wire to last very long at these temps.