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This looks like the kind of jobs local truck drivers bring me!
So, say I were to try to fix something like this. Here's how I'd approach it, and I'd like to see some serious feedback - just in case I ever come upon an actual problem like this.
I'd start by taking a cutting torch to the frame and removing the area with all the rust. Damn! That just sounds like a nightmare, but that's where I'd start.
Then, I'd start rebuilding the cut-away section with something like 1/4-inch thick angle iron and 1/4-inch thick flat bar (assuming the frame was about 1/4-inch thick or less).
The question I'd have is where should the welds be placed? I know that if I weld up all exposed sides of the angle iron and flat bar, the area would not be able to get any stress relief from frame flexing and such, and eventually the frame around the weld would twist and bend into, causing more serious problems when it broke later.
So, if a patch is placed on the frame after a bad section is removed, should the patch be welded along the horizontal segments (i.e. parallel with the frame) with the vertical end caps "unwelded" or vice versa (weld the vertical end caps and not the horizontal segments)?