What is a Plug Weld?

A Slot Weld is just like a plug weld It is made in a hole that is in a lap joint or a tee joint which joins the metal to the top of the other piece of metal

The remaining 5% are plug, slot and spot welds Butt Welds A butt weld is made within the cross-section of the abutting plates in a butt or tee joint

slot 27 Type b» may be used for connection of plating to internal webs, where access for welding is not practicable For size of slot welds, see C600

slot pnline Single-U butt weld 8 Single-U butt weld 9 Backing run; back or backing weld 10 Fillet weld 11 Plug weld; plug or slot weld