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Discussion in 'Electronic Design' started by martin griffith, Apr 24, 2006.

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  1. Sad tales of EMC problems here

    for example:
    "A 40kW RF welder (a dielectric welder for plastic materials) in use
    in a factory caused a mattress in a bed manufacturer's factory 60
    yards away to catch alight. The bed springs must have just been the
    right length to make an efficient antenna at the frequency the welder
    was using."

  2. 60 *yards* away and only a 40kW source? Hmm... or maybe the night
    manager was doing assisting some key employee in 'testing' of a sample
    mattress off the line, lit up a cig afterward and needed an excuse
    once the fire trucks arrived.

    Best regards,
    Spehro Pefhany
  3. My thoughts as well. :)

    I've always had a rather cynical approach about EMC regs, assuming
    that it was the "EMC industry" that required the ever changing
    regulations, just too keep up the cash flow, and this in turn provides
    work for the quill -pushing regulation generators

  4. Doug T

    Doug T Guest

    I wondered about it, but before one would lay blame or certainly could
    collect any money from the welding Company I would think some proof
    would be necessary. I Have burned through a SO drop cord and lit the
    incadesant bulb on a bandsaw the was turned off from thirty, forty feet
    away with a RF welder.Oddly enough that was a waterbed mattress sealer
    with about a six foot long die.

    Doug T
  5. Enormously unlikely.
    Also did not happen.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  6. Guest

    Respectfully disagree, I suspect the distance measurement is wrong.
    During my college days I once worked in a wooden and brick building
    with a 50 kilowatt 88 mhz war surplus welder. A ring of 4 power tubes
    in a free running oscillator. The fellow upstairs had a bunch of women
    welding plastic body bags under contract with it.. One quickly
    learned NOT to carry any copper pipe close to 3 meters in length around
    20-30 feet of that beast in any direction, up, down, or sideways.
    Metal tables in that room sparked like mad at considerable distances.
    I felt sorry for the women doing the job, none spoke english etc.

    Easily possible at say 60 feet. 60 yards is a bit of a fib.
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