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Carbon rod contact resistance

Discussion in 'Electronic Basics' started by amdx, Feb 8, 2008.

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  1. amdx

    amdx Guest

    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
  2. default

    default Guest

    I have a soldering set from the 50's that consists of a largish open
    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.
  3. amdx

    amdx Guest

    A few years ago I walked my son down to car dealer that
    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.
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