mhorowit wrote:
Somewhere I read about a welding exercise where the student built a
tube frame of some sort, pressurized it, checked for leaks, then
smashed it flat and rechecked for leaks.
I've looked thru my books but can't find it. Anyone recall where I can
find a description of the exercise? - Mike

Here is an idea:-

"Build a tube frame of some sort, pressurise it, check it
for leaks, then smash it flat and recheck for leaks."

Sorry - but you seem to have covered all of the
bases^H^H^H^H^H requirements already.

Oh, maybe you want to know how to interpret the results.
If it leaks you failed:-)