Long process of learning how to test welds in foils.  Here are some photos of the process in the link.

-----------> http://imgur.com/a/vQiya

We first started with machining a block and copying the best we could out of the D17.2 code.
Through trail and error we tried a few different ways to test the bursting pressure.  The foils are Inconel 625 at .003" thick.  We tried to test with no gasket at first and we ended up getting a few creases which got to around 200 PSI before leaking so much that we couldnt get any higher pressure.  After we tried to blend out the machining with fine wet sanding paper to make a cleaner connection. we then added a thin 3/32" runner gasket we made under the foil but on top of the male bottom end. for that we got to 500 PSI which made us very happy.  By this time the foil had seen some real bad damage from all the attempts to make it burst.  We tried a fiber gasket but the pressure from the clamping destroyed it.  Speaking of clamps.  C-clamps suck major.  What we ended up using was an old tineus olsen tension tester in out shop to compress the die onto the foil and we free balled to pressure valve to try and maintain 20k psi on the foil.  We finally got it to burst!  you can see the image with the small hole.  That foil was out tester.  Now that we had it down we got a new gasket and the customers foil and ran with it.  We loaded it down with 30K PSI then hit the water.  The foil blew clean at 650 PSI and we were very happy.  Thanks for reading!

Jordan