We have a large box structure which must go through thermal stress relief after welding. We have designed in 1/4" counter sunk vent holes in 3/4" plate in several locations to allow for air exhanged during stress relief. Intention was to seal weld them closed after stress releif. Is it possible to seal weld these up and stay in compliance with AWS D1.1 code? If so where is this allowed in the code? Seal welding does not appear to be addressed.