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Connecting two perpendicular mid-surfaces

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I’m a beginner with altair Hypermesh and today I try to connect two perpendicular surfaces together. My goal is to mesh those surfaces and be sure that the nodes of the horizontal plane are coincident to the ones on the vertical plane. For the moment, due to the mid-surface extraction, I have a gap between the two planes that's why the edge is a "free edge", from what i understand of the software. I assume that before starting the meshing part, i should connect the two planes together and have a "shared edge"... Is it the right way to deal with this situation ? 


Thank you very much for the help

system picture.PNG

midsurfaces extracted.PNG

edges to connect.PNG

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Thank you very much for this fast answer tinh

I tried the first solution, my surfaces are in contact but i still have a free edge as shown on the pictures below (basically, I extended the vertical planes to the horizontal one). Is the contact existing even with this free edge, or I still have to use an other tool to "merge" those planes to be sure my nodes will be aligned ?


surface edit panel used.PNG

Surfaces not connected.PNG

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