"John T" wrote in message
...
Another test is to put it in a vise and beat the crap out of it with a
hammer. If the tubes break before the welds, its a good weld.

Right, that is the first part of step 2.

Step one is to see if the welds are airtight, because aircraft welds should
be, so corrosion (rust) does not eat away the tube, with no visible warning.
--
Jim in NC