slot weld ✓ dimension of a slot weld is located to the left of the symbol

slot weld I would say when you plug weld you're dealing with round holes When you slot weld you're dealing with slotted holes

How to calculate the shear stresses in bevelled slot welds connecting two plates References: “Steel Design for Engineers and Architects”, 1992:

For slot welds, the width of each slot is given to the left of the symbol, with the length and pitch provided to the right

I would say when you plug weld you're dealing with round holes When you slot weld you're dealing with slotted holes

The current paper presents a finite element simulation of the residual stress field associated with a three pass slot weld in an AISI 316LN austenitic

Overview of plug and slot welds, their uses, symbology and application