Is there Weld Curves in Rhino ? Welding the Shapes
In Rhino, the term “Weld” is only used to fiddle with the display smoothing of meshes.
What problem are you trying to solve?
I suspect there is a command or commands that do what you want.
Is it removing the curve segments where the longer lines cross?
f so, the command would be Trim.
Please start the command and press F1 to see the help article for it.
Any luck?
I think you might want to look at CurveBoolean…
Actually it’s also hard to do with CB… What is possible is to make PlanarSrfs from the curves, then BooleanUnion them, (watch out for normal directions) and then MergeAllFaces.
@PowerShape Here is another quickie hackie script to do this automagically…
Here is a revised version that is a bit better. Output is joined and grouped.
UnionClosedCoPlanarCrvs.py (2.3 KB)
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bunu Rhinoya nasıl entegre edebilirim ?
Bunu yapamadım. Bunun için örnek bir video varmı? Teşekkür ederim. 
Can’t help you there. No, there are no videos to show how to make scripts run in Rhino that I know of.
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tamam teĹźekkĂĽr ederim
Yes, it’s not really designed for overlapping nested curves like that.
Do you have any other scripts that can do that?
No. The problem is that one still must decide what is a hole (delete) and what is around it (keep). A script can probably be concocted that would work for this particular configuration, but would fail for others.
The best thing to do is plan ahead for this situation - in this case if you make one surface with a hole in it out of two nested squares and then multiply that, PlanarUnion will work to get what you want.