An investigation of plug and slot welds, M S Thesis, Lehigh

So it's a slot & tab assembly ? the weld cap instruction over top of the symbol No sin in adding words in a note next to the weld, main point

Per AISC table , fillet welds in holes and slots are allowed in tension and is allowed to be neglected in design However, plug and slot

plug weld and slot weld Slot weld is also shown in the figure above It is quite similar to the plug weld, except that the hole is not circular, it is an elongated hole

plug slot weld Fillet Welds · Groove Welds · Surfacing Welds · Plug Weld · Slot Weld · Flash Weld · Seam Weld · Spot Weld