I've been practicing migging slices of scrap exhaust tubing together, and to check for leaks I've been filling the tubes with water and watching for dampness seeping out of the welds. Is this test sufficient to check for leaks, or should I pressureize the tube and spray test it?

 

i use a piec of threaded PVC pipe that i put a plug in and drilled it and put a air chuck in it this way i can plug one end and on the other end i can put pressure in it