Architectural/Structural Steel Drawings, ContinuedSteel trussconstructionSteel structures use trusses that are either welded or riveted. Welded steelconstruction is more flexible than riveted construction. In both cases somewelding or riveting is done in the shop and some in the field. Weld or rivetlocations are premarked or predrilled. You should use standard welding orriveting symbols on your drawings.Eight elements comprise each welding symbol. The reference line or base(A) is the foundation for all other elements. The arrowhead (B) points to thelocation of the weld. Center the basic weld symbol (C) (a fillet weld in thiscase) on the base on the arrow side of the object being welded.Thedimension and the length of the weld (D) appear near the weld.Supplementary symbols cap the basic weld symbol (E).This is the symbolfor a convex weld and finish markings (F) indicate the degree of finish. Thetail of the weld symbol (G) sets off symbols that show certain processes,specifications, or references. Omit the tail if no special instructions exists.Inside the tail, place the symbol or abbreviation (H) that represents theprocess, specification, or reference. This completes the eight elements of abasic welding symbol.WeldingsymbologyFigure 4-16 shows the elements of a basic weld symbol.Figure 4-16.—The eight elements of a basicwelding symbol.Continued on next page4-18
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