Carbon rod contact resistance
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Posted by amdx on February 8, 2008, 1:46 pm
Please log in for more thread options propane see used a carbon rod and battery charger to heat the copper connector. All worked well, but now I wonder, all the heat starts at the contact point. Is there somthing about carbon that causes a high resistance at the contact point? Does it matter what it is contacting? Thanks, Mike | |||||||||||||
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Posted by default on February 9, 2008, 9:29 am
Please log in for more thread options core transformer and a set of carbon rods. It is a good way to solder heavy things like auto radiators. Carbon/graphite is a semiconductor and has a relatively high resistance compared to metals - the size of the contact point and current available determine the heating. Does it matter what it contacts - yes won't work on insulating material obviously. Doesn't work so well on steel - at least my device doesn't. Good for heating non ferrous metals. -- | |||||||||||||
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Posted by amdx on February 9, 2008, 10:11 am
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>
>>I just finished soldering a #6 wire to a copper connector. I am out of
>>propane see used a carbon rod and battery charger to heat the copper >>connector. All worked well, but now I wonder, all the heat starts at >>the contact point. >> Is there somthing about carbon that causes a high >>resistance at the contact point? >> Does it matter what it is contacting? >> Thanks, Mike >> > I have a soldering set from the 50's that consists of a largish open
A few years ago I walked my son down to car dealer that
> core transformer and a set of carbon rods. It is a good way to solder > heavy things like auto radiators. > > Carbon/graphite is a semiconductor and has a relatively high > resistance compared to metals - the size of the contact point and > current available determine the heating. > > Does it matter what it contacts - yes won't work on insulating > material obviously. Doesn't work so well on steel - at least my > device doesn't. Good for heating non ferrous metals. > -- had large beam of light traveling across the night sky. It was an old search light on a truck with a generator. He described all about it and the carbon rods used in the carbon arc. It used two diameters, 3/8" and 5/8" IRC. The smaller one was tapered towards the end and caused a concaved shape in the larger one. Anyway he gave me 4 or 5 used rods 3" to 5" long. I recall useing one to heat a difficult to remove nut, that worked well also. Mike | |||||||||||||
>propane see used a carbon rod and battery charger to heat the copper
>connector. All worked well, but now I wonder, all the heat starts at
>the contact point.
> Is there somthing about carbon that causes a high
>resistance at the contact point?
> Does it matter what it is contacting?
> Thanks, Mike
>