I was reading this site and..

Manganese Neurotoxicity Presents as Parkinsonian syndrome..
About welding though many elemental metals are released in
welding plumes but they tend to want to focus on the manganese..
But.. One patient underwent chelation therapy
and after one month after completeing chelation therapy
his neurological examination had improved....

So maybe it's a good idea weither in parkinson or in any
neurological disorder to try chelation...
As it just may help...
As maybe some of theses neurological conditions have been triggered/caused...
by comeing in contact somehow with theses types of heavy metals or elements..

http://www.neurology.org/cgi/content/full/64/12/2033

As the welder is exposed to not just one...
But many elemental metals are released...
A person would not know if it would help them too..
Unless they tried it of course..

Why not ??