Invisible Fastening with Tab-and-Slot Joinery

The surfaces of objects can be fastened by gluing, welding, screwing, riveting, or, in this case: by interference-fit joinery.

In the case of welding, preparation (creating a groove for concealment) and/or post-processing (grinding flush) are inevitably required. Furthermore, with steel sheets, discoloration due to heat effects must be expected. While this phenomenon can be used intentionally as a decorative element for certain objects, in this instance, the concept was to visually hide the joints so that no other effect would distract from the purity of the form.