Will My Shop/Home Wiring Be Overloaded One Day?

This is what we found last year when half of the outlets in the house stopped working (I posted this on another thread but thought I should include it here). I kind of blame that incident on the welder that went inside there to direct hook-up his welding machine. Maybe the welder accidentally loosened a clamp screw. We will never know for sure, I just hope it never happens again.

CFE panel burned wire.JPG