Welder

Welder is a must-have for all hard surface artist. This addon will help you add believability to your artworks in no time. Welds creation has never been that easy, just select two objects and click one button to weld them along their intersection. If you're feeling creative, this addon will also allow you to draw it free-hand on another models surface.

Works with any Blender version from 2.8 to 4.0