# Weld Problem with attached mesh

**URL:** <https://discourse.mcneel.com/t/weld-problem-with-attached-mesh/77319>\
**Category:** Rhino for Windows\
**Created:** [January 14, 2019, 11:30am UTC](https://discourse.mcneel.com/t/weld-problem-with-attached-mesh/77319 "2019-01-14T11:30:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![detlef\_mueller](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/detlef_mueller/32/184852_2.png) [@detlef\_mueller](https://discourse.mcneel.com/u/detlef_mueller)\
**Post date:** [January 14, 2019, 11:30am UTC](https://discourse.mcneel.com/t/weld-problem-with-attached-mesh/77319/1 "2019-01-14T11:30:35Z")

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Hi,

I tried to weld this mesh with 180 degrees to get rid of multiple vertices, but Rhino does not weld the open edges. Also the WeldVertices command does not work.  
Can someone look at the file and tell me what the issue is?

thanks Detlef  
[WeldBug.3dm](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/2/a/2abeb34feb569b775b5b8ff34b9258e4541b9557.3dm) (93.8 KB)

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**Author:** ![clement](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/clement/32/759176_2.png) [@clement](https://discourse.mcneel.com/u/clement)\
**Post date:** [January 14, 2019, 1:28pm UTC](https://discourse.mcneel.com/t/weld-problem-with-attached-mesh/77319/3 "2019-01-14T13:28:59Z")

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Hi Detlef,

i’ve exploded then joined again. Then used `_AlignMeshVertices` on all naked vertices with a tolerance of 0.05 and `_Weld 180` worked.

[WeldBug.3dm](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/b/2/b259d8c36799d61d6bc21ad5b168f9ad8bef8180.3dm) (99.1 KB)

\_  
c.

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**Author:** ![Jussi\_Aaltonen](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/jussi_aaltonen/32/494409_2.png) [@Jussi\_Aaltonen](https://discourse.mcneel.com/u/Jussi_Aaltonen)\
**Post date:** [January 15, 2019, 10:35am UTC](https://discourse.mcneel.com/t/weld-problem-with-attached-mesh/77319/4 "2019-01-15T10:35:44Z")

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Hi @detlef_mueller,

you can also use MatchMeshEdge to get vertices aligned on those open edges.

- Jussi -