58 Modern Welding Groove Square Scarf V Bevel U J Flare-V Flare-bevel Fillet Plug or slot Stud Spot or projection Seam Back or backing Surfacing Edge Weld all around Field weld Melt through Consumable insert (square) Backing or spacer (rectangle) Flush or flat Backing Spacer Convex Contour Concave Weld Symbols and Supplementary Symbols Plug Slot Figure 3-22. Weld symbols and supplementary symbols. These may be part of the complete welding symbol. (AWS A2.4:2012, Figure 1, Weld Symbols, and Figure 2, Supplementary Symbols, reproduced with permission from the American Welding Society, Miami, Fl) Figure 3-23. Reference line, arrow, weld symbol and tail of the complete welding symbol. A—Drawing and welding symbol. B—The edge shape of the metal. C—Completed weld. Tail Reference line Weld symbol Arrow A B C