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

Is this a plug weld? : rStructuralEngineering plug weld vs slot weld such as contour weld and field weld Arc and gas weld symbols are divided into groove types , bead, fillet, plug, and slot welds plug and slot welds Plug and slot welds are permitted for the transfer of shear force only As such, they are sometimes used to transmit shear in lap joints, to join components of

plug weld and slot weld Plug weld Optional automatic weld preparation No Supported solid weld object Slot weld Optional automatic weld preparation No Supported solid weld