Its almost the same thing with welding, it starts rusting from the inside...because its hard to protect (best way is as much oil/undercoating as possible, since you cant paint there). Rust is like canser, its cant stop, its only slowing it down...
One thing you can do thats as good as welding in riveting new metal in, if you cut/prep well, it can be just as effective, and its somthing you can do for almost free (rivet guns are cheap, and so is sheat metal!)
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