SOLIDWORKS Tab and Slot for Hobbies

When a design calls out for a tab to be inserted into a slot and then welded over, what type of joint would this be considered?

tab and slot, be sure to slightly over size the slot I added 003 to each side of the slot So for 250 thick plate, I made the slots 256 wide This

tabasco slot machine CertiFlat FB3696 3'X8' FabBlock Welding Table Top Kit Modular Welding Table DIY $2, Help & Report CertiFlat 0253016 6 6900lb Powder Coat Finish

tab slot And the way Tab and Slot does this is pretty genius These welding tables, blocks, and fixtures are designed to be slid together and welded with a tab-and-slot