You'd better hope they fill the tank with either nitrogen or argon before (and all through the welding process) they weld it. Otherwise the tank will explode when the gas fumes are released by the heated metal. Water will not wash away the fuel trapped in the pores of the aluminum.
I used to weld gas tanks from motorcycles and after my first "poooofer" learned real quick.
And as a disclaimer, I welded for a living all my working life, anything from carbon steel up to titanium. Got quite a few thousand hours of experience (38 years) under my belt. Any place from a dirty steel mill to nuclear powerhouses to oil refineries.
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