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heat wire used in soldering iron

Discussion in 'Electronic Basics' started by Jon Slaughter, May 4, 2007.

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  1. I had an hold cheap iron and I tore it apart. Essentially it uses a wire
    wrapped around a ceramic cylinder with another ceramic cylinder on top.

    I took about two inches of the wire which is about awg 30 or 29 and it
    measured about 30 ohms.

    This seems much larger than the 8Ohms/ft that nichrome has...

    http://www.heatersplus.com/nichrome.htm

    What is this stuff?

    Thanks,
    Jon
     
  2. Ron M.

    Ron M. Guest

    It's still nichrome. Different mixtures of the nickel and chromium
    plus other additives give different resistance factors. The one you
    referenced is Nichrome 60 which is only one of many different
    formulations. Try looking here. Go to bottom of pasge as they give
    listing of different formulations with resistance per foot and the
    mixtures.

    http://www.wiretron.com/nicrdat.html
     
  3. Cool, was looking for something like this. (trying to find some thin but
    highly resistive heater wire).

    Thanks,
    Jon
     
  4. Try an unused light bulb.
     
  5. Phil Allison

    Phil Allison Guest

    "Homer J Simpson"


    ** Pure idiocy !!!!!

    Tungsten has * LOW * resistivity - about double that of aluminium.

    It corrodes easily and has a high tempco of resistance.




    ........ Phil
     
  6. Bob Masta

    Bob Masta Guest

    "Corrodes easily" is an understatement once you start
    heating it up. (Try running a bulb without an envelope... he, he!)

    But there is a new and better reason to avoid tungsten:
    It is *extremely* carcinogenic. A tiny fleck stuck in your
    skin can cause cancer. (Well, it does in lab animals.
    If any creationists out there don't think they share any
    common ancestry with rats and mice, by all means go
    ahead and experiment on yourself to provide some
    data points for humans.)

    Best regards,


    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!
     
  7. john jardine

    john jardine Guest

    [...]

    Cor strewth!.
    Had me worried there, with the amount of Tungsten Carbide tooling I use.
    Looked on the web and could not find any carcinogeneic effects for Tungsten.

    You're weren't by any chance thinking of depleted Uranium, Tungsten
    penetrators by any chance?
     
  8. John Fields

    John Fields Guest

     
  9. Fred Bartoli

    Fred Bartoli Guest

    john jardine a écrit :
    Lol! I guess that if one is 'stuck' under your skin, you'll have some
    other problem than worrying about cancer :)
     
  10. Chris

    Chris Guest

    Hi, Jon. If you're looking for a small quantity of good resistance
    wire, you could do a lot worse than just scrounging a power wirewound
    resistor with ceramic coating, and carefully chipping off the outer
    coating. If it hasn't cracked by the time you're done, break the
    ceramic core and voilla! resistance wire with pre-welded contacts that
    you can solder (the caps and leads).

    This has the added advantage of being low temperature coefficient wire
    (resistance changes with heat, and standard heater wire will vary by a
    lot more than the 5% tolerance of resistance wire nichrome alloy).
    Make sure you derate the wattage a lot -- the coating and ceramic core
    really help dissipate the heat, and with them gone, it can't handle
    the same wattage.

    Good luck
    Chris
     
  11. Hardly.

    Tungsten powder is used as a filler material in thermoplastic composites
    which are used as a nontoxic substitute for lead, in bullets, shot, and
    radiation shields.

    Tungsten is also beginning to see uses in jewelry. Its hardness makes it
    ideal for rings that will never scratch, and will in turn not need polishing
    (this is especially good for brushed designs).

    On August 20, 2002, officials representing the U.S.-based Centers for
    Disease Control and Prevention announced that urine tests on leukemia
    patient families and control group families in the Fallon, Nevada area had
    shown elevated levels of the metal tungsten in the bodies of both groups.
    Sixteen recent cases of cancer in children were discovered in the Fallon
    area which has now been identified as a cancer cluster, (it should be noted,
    however, that the majority of the cancer victims are not long time residents
    of Fallon). Dr. Carol H. Rubin, a branch chief at the CDC, said data
    demonstrating a link between tungsten and leukemia is not available at
    present.
     
  12. Bob Masta

    Bob Masta Guest

    Nope, tungsten slivers. Saw it in Science News last year.
    A search on "Tungsten Cancer" turns up several hits,
    including:

    www.sciencenews.org/articles/20050319/note13ref.asp

    Just dredged up the original Science News article from my dead-tree
    archives: The tests were on an alloy that was 91 percent
    tungsten, with cobalt and nickel, commonly used in
    bullets as a replacement for uranium and/or lead.
    Pellets were surgically implanted in rat leg muscles.
    Some groups of rats got other metals (nickel or tantalum).
    Within 5 months, all animals getting tungsten were dead
    from cancer that had spread to their lungs. Tantalum caused
    no problems; nickel caused fatal cancers at the wound sites,
    but did not spread to the lungs. The findings were to be
    reported in "Environmental Health Perspectives".
    Research was conducted by John F. Kalinich at the
    Armed Forces Radiology Research Institute in Bethesda, MD.

    Best regards,


    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!
     
  13. john jardine

    john jardine Guest

    Yes. When searching I turned up that Tugsten-alloy study in numerous places
    and it's extremely worrying.

    But ... I should be worried but I'm not. Why? ...Simply because no other
    research group seems to have picked up on it.
    This is very puzzling as the Rat cancers reported in at 100% and not the
    usual wishy-washy "we've found a statistically significant correlation".
    For sure though, a vast army of other researchers would have seen this
    study. Seen it's Black and White outcome and dreamed pleasant dreams of big
    grants, seminal papers, fame and fortune, all built on the back of telling
    the world of this new Satan in our midst.
    They've now had over two years and zilch!.
    I'd like to think that because of the universal use of Tungsten, there's
    been a world-wide cover up.
    Sadly, I suspect the real 'truth' is much more mundane.
     
  14. .
    Feh.

    EVERYTHING causes cancer in lab animals. That's the way they breed them,
    to be predisposed to cancer, so that they have a handy supply to justify
    the huge grants they get when they show that some advocacy group's
    favorite evil substance "causes" cancer.

    Thanks,
    Rich
     
  15. Rich Grise

    Rich Grise Guest

    Maybe he's talking about the grinder dust when you put a nice new point on
    your thoriated tungsten TIG electrode? ;-)

    Cheers!
    Rich
     
  16. Ah-HA!!!

    So you ADMIT IT!

    Lung cancer is _NOT_ caused by smoking, it's caused by TUNGSTEN!!!!!!

    I always knew the antis were pathological liars.... heh, heh, heh >:->

    Thanks!
    Rich
     
  17. ISTR a lab which tested the surface of grilled steaks and found that it
    caused cancer. When asked what happened to the steaks the researchers
    replied that they ate them.
     
  18. Bob Masta

    Bob Masta Guest

    In looking at the original report, it seems to me that another
    possible interpretation of the data would be that nickel caused
    the cancers and tungsten caused them to spread. They didn't
    test pure tungsten, only alloyed with nickel and cobalt. Since
    nickel alone caused non-spreading tumors, maybe the combination
    with tungsten caused some second-order effect that simply
    increased the ability to spread. Angiogenisis could increase
    blood contact with the tumor, for example. Or maybe the
    tungsten prevented the tumors from consolidating, leaving
    them as lots of loose, mobile cells. Lots of alternatives.

    But personally, I'm still not planning to do any more messing around
    with tungsten wire. The stuff is extremely brittle and unworkable
    in the first place, and even when you simply cut it with (heavy duty)
    side cutters, it tends to splinter at the cut. (The wire is
    ostensibly solid, but at the cut/broken end you can see 3 separate
    strands that appear to have been milled together to make the final
    product.)

    Best regards,



    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!
     
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