Plug welds are a round weld that is made inside of an existing hole most commonly in one piece of metal, welding that piece to another member. The plug weld symbol is a rectangle with a diameter symbol placed to the left of the symbol as well as the numbe

Plug welding is an alternative technique to spot welding where overlapping metal plates are joined together by a series of small circular welds. This method commonly is used in automobile manufacturing and restoration, where spaces are too small to fit a

The welding machine I'm using for this tutorial is the Klutch ST80i Inverter Stick/TIG Welder from Northern Tool. The welder retails for $180 and plugs into a 110/120 volt outlet (standard US wall plug).