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Tom Griffin
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Any halogen (chlorinated, fluorinated, brominated, etc.) solvents or refrigerants all when exposed to hot metal surfaces (not UV radiation) can and will produce very toxic gases, phosgene in only one of them, not only should you make sure the part are not only dry but the welding area is well ventilated as well. Generally any Non-flammable solvents are halogenated. Flammable solvents generally are free of halogens. As stated acetone will not damage any metal surfaces but be careful around paint and polymers.
Not to hijack the thread any further, but the United States Depart of Labor seems to disagree. From their web site:
"CHLORINATED HYDROCARBON SOLVENTS
Various chlorinated hydrocarbons are used in degreasing or other cleaning operations. The vapors of these solvents are a concern in welding and cutting because the heat and ultraviolet radiation from the arc will decompose the vapors and form highly toxic and irritating phosgene gas. (See Phosgene.)"
Tom