1926.354, I am in the process of finding the determining factors for enclosed spaces. If memory serves me correctly it is somewhat missleading in the fact that a small shop with low ventalation, could fall under the enclosed space catagory, and the ventilation requirements would put you in a predicament as exhaust fans create to much wind flow for welding applications.
I think this is also covered in another regulation, but I need to get to my office to find that information.
I will post again as soon as I get there.
John
OK, I am back at the office. See 1926.353, Ventilation and protection in welding, cutting, and heating, in its entirety. Then see 1910.252(c)(6)(ii) which will send you to paragraph (c)(3) and notice the minimum air flow requirements.
Sorry, it might be benificial for proper interpretation to read the entire document, or at very least start at 1910.252 (c)(2), ventilation for general welding and cuting.
Now I could very well be misinterpreting thes regulations, but what I see is that the coating must be removed prior to welding or adequate ventilation must be provided, which is a heck of a hoop to jump through while keeping weld quality.
Now to the question of code: Since none has been referanced I will use D1.1 first. D1.1 5.15 while the entire paragraph applies, I beleive that the pertinant part would be "other foriegn material that would prevent proper welding or produce objectionable fumes." I do not think anyone can classify zinc oxide as anything but objectionable fumes. It is a health hazzard.
D1.1 8.5.1 while this is in the repair section it does address new base metal and in my opinion would be applicable to new material that has coating on it.
I by no means have a closed mind to this subject, and I am very well aware of the fact that I have much to learn so anyone who has a different outlook on this please chime in, I am more than willing to listen. We weld galvanized product on a daily basis and if we can tone down the steps we feel we must go through and still keep our employee's healthy and safe, I am all for it.
John