Hi
please see attached image. I had a mesh which came apart at the seam when it went through decimation master. the join between two poly groups is the place it has come apart, even though it started life as a contiguous mesh 
any ideas why it happened or how to fix it aside from retopologising, which I want to avoid…
I tried the weld buttong but ti didnt seem to do anything, I might be using it wrong mind you, Im new to 4.0
cheers
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](javascript:zb_insimg(‘237895’,‘mesh%20hole.jpg’,1,0))