ASME standards Weld Symbols


ASME standards 3.3 Weld Symbols. Weld symbols shall be as shown in Figure 1. The symbols shall be drawn in contact with the reference line. 3.4 Supplementary Welding Symbols. Supplementary symbols to be used in connection with welding symbols shall be as shown in Figure 2. 3.5 Welding Symbols. A welding symbol may consist of several elements (see Figure 3). Only the reference line and the arrow are required elements. Additional elements may be included to convey specific welding information. Alternatively, welding information may be conveyed by other means such as by drawing notes or details, specifications, standards, codes, or other drawings, which eliminates the need to include the corresponding elements in the welding symbol.

The tail of the symbol is used for designating the welding, brazing, and cutting process as well as the welding or brazing specifications, procedures, or the supplementary information to be used in making the weld or braze.

The process; identification of the filler metal that is to be used; whether peening, backgouging, or other operations are required; and other pertinent data should be known. The notation to be placed in the tail of the symbol indicating these data is usually established by the user. All elements, when used, shall have specific locations within the welding symbol as shown in Figure 3. Mandatory requirements regarding each element in a welding symbol refer to the location of the element and should not be interpreted as a necessity to include the element in every welding symbol. 3.6 Placement of the Welding Symbol. The arrow of the welding symbol shall point to a line, location, or area that conclusively identifies the joint, location, or area to be welded. 3.7 Illustrations. The examples given, including the dimensions, are illustrative only and are intended to demonstrate the proper application of drafting practices. ASME standards They are not intended to represent design practices or to replace code or specification requirements.