Posted by JD Seller on February 24, 2016 at 18:02:16 from (208.126.198.123):
In Reply to: Re: Brake Cleaner posted by dr sportster on February 24, 2016 at 16:33:44:
Welding around the cleaner is only an issue if you using a gas shielded welder. It takes Argon to make the Phosgene gas.
The chemical in the brake cleaner is Tetrachloroethylene. When this chemical is exposed with excessive heat and argon (used in MIG and TIG welding) it produces phosgene gas.
Also you have to weld the items cleaned with the cleaner BEFORE it evaporates off. That would mean as quick as a minute or two. So if you clean some thing and come back in 5-10 minutes you going to be safe.
Also even light ventilation will prevent any issue too. The most common way guys get sick form it is cleaning aluminum right before they weld it. Aluminum has to be very clean to weld correctly. So guys use common old brake/parts cleaner right before they weld. Also most fellows welding mig/tig do not want much air flow right where their trying to weld as it makes keeping the shield gas around the weld harder. So you have the prime items for accidental exposer to the Phosgene gas.
So guys it is more of a caution type of thing. It takes several conditions to make it be harmful. If you wash parts and come back in an hour your safe. If your welding with a stick welder your safe. If you preheat the metal before you weld it with a torch your safe.
So guys there are many things more dangerous in your shop than our can of brake clean.
PS for cleaning right before MIG/TIG welding use acetone. It cleans better and has not reactions with the shield gases.
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