What Ed said. Any sharp transition forms what's called a stress riser. The boxing plate should be formed into a "U" shape with the ends where it's welded to the frame tapering to a point.

I just fixed up some boat seat frames that had a right angle transition from the vertical to the mounting plate. They had cracked right at the sharp corner. The previous owner welded the crack, and they promptly cracked again. I welded in a fillet so the transition to the baseplate is now about 120 degrees instead of 90. We'll see how it holds up, but I expect not to have problems in the future.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.