Question 1: What is the best approach to weld inspection for T Y & K connections (pipe to pipe fishmouth welds)? (For example: Maybe the prepared connection gets visually inspected prior to welding, and then the root pass gets magnetic particled, and then the fill and cap passes get...
AISC Rectangular HSS Sections go up to a max size of HSS 20x12x5/16. The design of sections up to that size clearly fall within the specification of AISC Steel Construction Manual.
What if you make a built up box section beam, for example, out of 1/2" plate to create a 24" x 18" x 1/2" plate...