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A. First of all, let me say that I'm not an industrial hygienist or doctor. You should consult one. But, following the advice below will do you no harm.
First, if you're welding pieces that are galvanized, the zinc burns up and makes a fume that can make you sick as a dog. I speak from experience. You should be wearing at the very least, an air purifying respirator when you are doing this work.
Second, if you weld stainless that has chromium in it, the fume from that can have hexavalent chromium in it. Again, at the very least, an air purifying respirator.
Third, there's a class of solvents called "cellosolves." They're not too toxic, generally, but they're known to do harm to pregnant women. You may not use these solvents at all in your plant, but if you're around solvents, ask what solvent it is, and if it contains one of these chemicals.
I am pretty sure that there are protective measures that will allow you to do your job safely. But, again, check with a real expert.
Good luck, and the best to you and your family.
Dave Wichern
Consultant - The Bronx, New York
A. Dear Holly
welding fumes in google will give you loads of results
I copied a few for you
see if you like the answers.
http://www.cpwr.com/hazpdfs/kfwelding.PDF ⇩
https://web.archive.org/web/20120425060531/http://www.cpwr.com/hazpdfs/kfwelding.PDF
http://www.uwsp.edu/ehs/Training%20Files/welding%20fumes%209-05.pdf ⇩ https://web.archive.org/web/20100529103556/http://www.uwsp.edu/ehs/Training%20Files/welding%20fumes%209-05.pdf
http://www.cdc.gov/elcosh/docs/d0100/d000026/d000026.html ⇩ https://web.archive.org/web/20070101145642/http://www.cdc.gov/elcosh/docs/d0100/d000026/d000026.html
http://www.osha.gov/SLTC/healthguidelines/weldingfumes/recognition.html ⇩ https://web.archive.org/web/20100309221619/https://www.osha.gov/SLTC/healthguidelines/weldingfumes/recognition.html
Jouke [surname deleted for privacy by Editor]
- Israel
Ed. note: Thanks, Jouke!
Ed. update: All four of Jouke's links broke. Thankfully, the Internet Archive preserved copies of all of them 
Seeing for yourself how precious the Internet Archive is, and how difficult their job is, please consider a donation -- especially right now when the scummy RIAA is draining the Archive's resources with court actions and endangering its continued existence.
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