I've bought a welded aluminum cap for my truck, and I noticed
a fairly strong manufacturing smell. Aluminum itself has no smell
of course, so I guess this is left over from welding. I am wondering
if there is a standard way to clean welded aluminum to remove
any scents or toxic residues.
Thank for any help.
It is highly unlikely that you're smelling anything due to welding.
Most likely what you're smelling is outgassing from the solvents
used in the adhesive which attaches the rubber seals to the
shell. That'll stop in a few months.
Flux is only used to gas torch weld aluminum. I very seriously
doubt that's how the cap was welded (normally it would be MIG
or TIG welded). One other possibility, however, is the lubricant
used when forming the pieces. That may not have been thoroughly
cleaned off, and does have a pronounced odor.