Plug welding hole diameter ?

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 - perpendicular · Plug weld - with bevel · Groove weld - perpendicular · Groove weld

slot seiten For example, if a diameter of a hole for a plug weld is to be 6mm, the plug weld symbol will be accompanied by Ø6 on its right side, signifying

slot cavity preparation My question is, would I be able to plug weld or slot weld the 78 tube in with a stickarc welder? Reason I ask, is that I have only ever