Normally the machined tubular parts we use have +/- .003" on all dimensions. To calculate MAWP per B31.3, B31.1, etc. we use the minimum material (wall thickness) condition, given the machining tolerances. Although it is not really relevant to the discussion, UG-16 of Section VIII allows the...
We are attempting to weld small tubular sections (7/8" OD x 1/2" ID) of aged Inconel 718 with 625 filler. We're using 625 filler for two main reasons; 1. Availability vs. 718 or 725 filler 2. Lower tendency for weld cracking (we are told) compared to 718/725. We need the strength of 718 in one...
Per B31.3, impact testing for a weld is not required if the maximum obtainable width across the notch is less than .098".(correct me if I'm wrong) Base materials and filler metal are good at the -50F temp. If I run a .096" thick PQR, naturally I cannot get a charpy of .098" width. This would...
Currently ASME IX requires supplementary essential variables (SEV) only when impact testing is required, I believe. Many of the GTAW WPS we have (for butt and fillet welds, not hard-facing) require HAZ, base metal, weldment hardness testing. Do you think it is a good practice for these types...
