a plug or slot weld is what type of weld, just prepared differently?

Fatigue strength of fillet-weld, plug-weld, and slot-weld joints plug and slot welds 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 and slot weld symbol Slot or Plug Welding Symbol Diagram of Plug or Slot Welding Symbol indicating angle of countersink, pitch, size and depth Plug & Slot Welds

plug slot Plug welds and slot welds are used join overlapping members, one of which has holes in it Weld