Use this caddy for setting the weld threshold for vertices and edges and previewing the number of sub-objects to be welded.
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Select an Edit Poly or editable poly object. >
Modify panel > Vertex or Edge sub-object level > Edit Vertices/Edges rollout > Weld > 
(Settings)
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Select an Edit Poly or editable poly object. > Vertex or Edge sub-object level > Quad menu > Tools 2 quadrant > Weld > (Settings)
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Select an Edit Poly or editable poly object. > ribbon > Modeling tab > Polygon Modeling panel >
(Vertex) or
(Edge) sub-object level > Vertices or Edges panel > Shift+click
(Weld) or choose Weld Settings from the drop-down list.
Interface
Weld uses the caddy interface when Enable Caddy Controls is on; when off, the standard settings dialog is used. For details on using the caddy controls, see The Caddy Interface.
Left: the caddy interface; Right: the standard dialog
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Weld Threshold -
Specifies the maximum distance, in scene units, within which selected sub-objects will be welded.
Any vertex or edge that lies outside this threshold (that is, it's farther than this from the nearest vertex or edge) will not be welded.
- Before/After
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Shows the number of vertices before and after the weld.
The After quantity updates dynamically as you change the setting.
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OK -
Applies the settings to the current selection and closes the interface. Keyboard equivalent: Enter
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Apply and Continue -
Applies the settings to the current selection, retaining them for the preview if you then change the selection. Keyboard equivalent: Ctrl+Enter
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Cancel -
Closes the interface without applying the settings to the current selection. Does not reverse previous uses of Apply And Continue. Keyboard equivalent: Esc