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Hi new welder, Welcome to the forum.
We are a Structural Steel fabricator. We currently use SMAW and FCAW for all of our welding needs. We fabricate the steel skeleton of buildings. We order lengths of beams or columns from a steel mill. We then cut to length, add any and all connections, then load them on a truck and ship them to the jobsite where an erection crew hangs the steel. We fabricate/weld steel items from 1/8" thick on up to as much as 6" thick (we could weld thicker, but that's about the thickest I 've seen in my 21 years with this company). As for codes to weld/inspect by, we primarily use AWS D1.1:2006.
If you have any more questions about our type of work, just ask.
We also do our own in-house weld inspection using visual(VT), liquid dye penetrant(PT), magnetic partical(MT), and ultrasonic testing(UT) methods of inspection.
John Wright