How to weld all lines together

[silk.zither]

I'm new to 3dsmax. I created several lines within one Editable Spline. These lines should all be connected, as I made sure to use vertex snap. However for some reason, though they are connected, they are not of a single entity. You can see in the second image that the junctions are not joined properly into one single spline. I tried selecting that Vertex and click Weld but nothing happens. How do I fix these junctions so all these splines become one?

 

[rendermaster]

you cant weld them

[silk.zither]

So is there no other way to fix those joints to get a single continuous spline rather than separate ones?

[silk.zither]

Nevermind. I turned it into Editable Poly and fixed it by deleting a few Segment and reconnecting Vertices using the "Connect" button under Geometry.