Welding Symbols for AutoCAD - WeldSym draws welding symbols including Fillet, Plug, Spot, Seam, Square, V, Bevel, U, J, Flare-V, Flare-Bevel, Backing, Surfacing, Flange-Edge and Flange-Corner, including Supplementary Symbols, Contour, Finish, Process, Location, Size, Length and Pitch.
WeldSym by CCAD inc. works with AutoCAD r14 and later, but does not work with AutoCAD LT.