Here's the first 12 feet of my 21' boat. Fun stuff.. The frames you see are 1/4" 5052-H32 with a 1/4x1-1/2 6061-T6 flange formed then welded to them. These are tacked and ready to be ground and fully welded. The face edge gets welded and then ground flush also..
Here's one I finished tonight.
The plans don't call for full welds and you wouldn't see this in a store bought boat because it would put too much cost into it. However, it's my boat and I have plenty of time to go the extra mile. Besides, it's good practice doing all that welding and not warping the crap out of it. LOL...
Here's the face edge.
Try bending this all in one piece and do it close enough to TIG it... Gotta remember it's 6061 T6 so you can't heat form it. Don't even ask me how many times I went from back and forth from the bender to the frame checking it.
See, I don't just sit around talking about welding, I actually do it.