Metal fume fever is usually associated with welding on galvanized material. The symptoms are very much like having a bad case of the flu. The poisoning in this case is usually from an over-exposure to zinc and "normally" symptoms go away after a day. Metal fume fever is very easy to avoid by just taking some precautions before welding. Click here:
http://files.aws.org/technical/facts/FACT-25.PDFFlash burns are very painful and feel like the eyes are full of sand.
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http://files.aws.org/technical/facts/FACT-26.pdfYou can download the AWS Safety & Health Manual, Z49.1 for free
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http://www.aws.org/w/a/survey/standard.html?survey_start=z49_reqpdfNow, this sounds like a problem with the employer's safety practice but your boyfriend should also bear some of the responsibility for these conditions as BOTH are easily minimized, or avoided all together with a small amount of pre-planning. He should take steps to protect himself as welding has many hazards, most of which can be avoided or eliminated all together with some pre-thought to doing one's job.
If you contact OSHA, there is a pretty fair chance your boyfriend will eventually lose his job or be placed in such miserable conditions he'll be forced to quit. I'd suggest that he discuss with his supervisor and maybe even express an interest in trying to avoid or correct these problems.
In the safety industry, he'll hear such slogans as "Safety begins with me" or "Safety First" - these are serious statements and intended to make workers aware of their personal responsibility in watching over their OWN health and safety, not relying on someone else to do it for them!
Finally, if he is injured seriously at some point, the first point of the investigation will be "was the worker following safety rules?" Almost every company has a set of safety rules, insurance forces it. If he wasn't following the rules, he could be fired IMMEDIATELY and unlikely to be able to gain any compensation.
This is serious stuff, you can imagine, I've spent some time writing this response. The concerned girlfriend has good and valid concerns but the boyfriend also has to take some concern for watching out after himself and refusing to work in conditions or situations he feels is dangerous to his health. Good luck.