Un-weld?

You would have to go to node edit, break the node apart at the area, and rearrange them and reconnect them in a way that matches how they were before the weld.
 
Draw a line or box through the part completely. Extend it past the part actually. Do an XOR weld, then go back and delete the parts that were over extended.
 
Not a bad solution, both methods work depending on the shape of the part where you need to unweld.
 
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