Butt, Tee and Other Welds with Basic Weld Symbols

The spot weld symbol is a circle which may be placed on the solid line, meaning arrow side, or on the dotted line meaning far side. More common is to place it on the center of the line (leaving out the dotted line). If you wish to state the number of spot welds, you can add that to the tail. (i.e. 4 x 90 deg.). The process depends on the skill of the welder. Either a TIG weld or a stick weld at low current.
Hope this helps.