1. Weld points - the points snapped together but failed to join the two objects together.
2. Weld edges - if I go with the default setting (input edges), no edges are welded, even if I maximize the weld distance. If I select 'other edges' or 'all edges', the geometry gets messed up but when I decrease the weld distance to a value that doesn't mess up the geometry, the edges do not weld together.
3. Select both objects and do Create->Poly_Mesh->Merge - nothing happens. No new geometry is created. Using the 'bridge' option does not work as well.
I have cleaned up the geometry and have made sure that all (polygon) normals have been unified (facing outwards). Any assistance would be greatly appreciated.