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Hello! My name is Mac. On behalf of the expertvillage.com, I would like to continue our discussions on
arc welding. We have been discussing welding safety in this online course and I think it
is appropriate at this time to touch a little bit on some other things that are dangerous
to actually weld on. Closed cylinders or pressure vessels or any kind of a fuel tank that has
contained a liquid hydrocarbon fuel is extremely dangerous. Welding on leaking gas tanks for
instance of automobiles or pickup trucks, cutting holes in service station gas tanks,
these things are extremely dangerous. It is recommended that you not do anything like
that, don’t run a bit of weld on it, don’t weld anything to it. What can happen is even
if it is an old tank and you are pretty sure that there is nothing inside of it, the heat
of the welding process can drive vaporized fuel out of the molecules of the steel and
inside of the tank that can ignite and cause an explosion. The resulting explosions can
kill you or maim you. So unless you know the exact procedure for filling the tanks with
either water or inert gas before you cut or weld on them, please avoid doing that.