How to smooth a mesh border?

Well … I join two meshes into one, but the borders are not smooth, how can I make an soft transition for the borders?

By having the same normals on the vertices as the underlying surface

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Sorry, I do not understand what you said

A normal is the direction the surface is facing. If both meshes face the same direction right at the border, you won’t be able to see a seam (assuming there’s no actual gap between them and the topology matches well enough). You can use Blender’s Data Transfer Modifier for this.

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I tried using Data Mesh, but it made no difference
I have a print of wire to get easier