On Fri, 24 Oct 2014 13:39:28 -0700 (PDT), wrote:

On Friday, October 24, 2014 11:26:51 AM UTC-4, Ed Huntress wrote:
On Fri, 24 Oct 2014 07:55:45 -0700 (PDT),
wrote:

On Friday, October 24, 2014 8:15:52 AM UTC-4, Ed Huntress wrote:
On Fri, 24 Oct 2014 04:42:29 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

Martin Eastburn fired this volley in
:

That is 1000 times if those are the correct values of 10^11 vs 10^14.
That is a wide band difference.


It doesn't much matter how wide the difference is.

Lacking a tuned tank, any arc (AC or DC or HF modulated) is a "broadband
emitter", radiating RF all the way from SLF (audio) frequencies clear up
to ultra-short wavelength UV. (and maybe beyond).

Some welders have chokes and various tank circuits (generally in the form
of low-pass filters) to help prevent emission through the body of the
unit, but the welding leads always act as antennae.

Of course, any electrical apparatus has "tuning peaks" that tend to
absorb or radiate certain frequencies preferentially over others.
Manufacturers try to make their units suppress radiation in the ranges
where radio communications is done -- with varying degrees of success.

It's generally recommended that people with electrical cardiac or
neurological assistance devices avoid close proximity to arc welders of
any kind.

Lloyd

Lloyd, the radiation from welding arcs is nowhere near "broadband."

Which welding arc? When welding which material, substance or element? Different types of energy are emitted per materials used. Arcs form inside microwave ovens (due to conductivity, etc)

Wel

If you have evidence of welding arcs producing significant microwave
radiation, please let us know.

That spectral graph I linked to is the one I first saw from the AWS
around 40 years ago. It hasn't changed.

"A microwave oven heats food by passing microwave radiation through it. Microwaves are a form of non-ionizing electromagnetic radiation..."
-- http://en.wikipedia.org/wiki/Microwave_oven

Are you welding, or heating your bean soup?

This is not a microwave oven. It's a welder.

--
Ed Huntress