The length of the slot weld can be obtained from the ratio of

It is, in essence, another practical limit on fillet weld size This is discussed in more detail later Plug and Slot Welds SCM specifies the effective

My logic is that it isn't a fillet weld that is limited to the inside corners of the slot, , the fillet weld is deposited on the joint,

plug weld vs slot weld Plug weld - perpendicular · Plug weld - with bevel · Groove weld - perpendicular · Groove weld

plug slot weld The seam weld uses a similar process as a spot weld but in an elongated fashion There is no preparation like a plug or slot weld, rather the weld projects