How are these parts joined together?

[u/Myreauks]

This is a table leg made by TIPTOE. I am just wondering, how are the parts joined together as there are seemingly no weldings visible? The joints must be pretty strong as it can support even heavier tabletops?

[u/Photon_Chaser]

Clamp plate press fit onto rib plate, then that assy is press fitted to the brake press formed bracket.