Certiflat tab and slot welding table kit

Welding and Fabrication Table Top Thickness - 14″ vs 38 tab and slot welding table want one of those tables My shop is in I'm tired of tig welding standing up 8 yrs taboo slot 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 solidworks The Easiest To Assemble Welding Table Kit , Includes Tab And Slot Interlock Webbing Design This Ensures The Good Flatness Of The Table, Avoids Flex At