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

Plug and Slot Weld Design of Steel Structures plug weld and slot weld Plug welds are circular welds made through one member of a lap or tee joint joining that member to the other The weld may or may not be made plug weld vs slot weld - Slot welds are typically used in lap joints where the fillet weld length is limited Plug Welds:

plug slot weld Plug Weld or slot weld: It is used for attaching flat plates using one or more holes or slots in the top part and then filling with filler metal to fuse the two