Cmd/Weld

Weld has faces to share common vertices, if they're in the same location. The mesh data shrinks due to fewer vertices.

Weld is useful also for problematic disjoint meshes. Scaling can fail if not Wleding beforehand.

I scaling a mesh consisting of multiple patches (Explode returns multiple meshes) the vertices on the edges of those patches can end up in slightly different places due to rounding errors, and so they are no longer shared.

In order to get a single mesh that, upon exploding, does not give multiple patches, you may want to Weld with angle 180 degrees, which will remove any duplicate vertices.