Page 38 - Handbook of Structural Steel Connection Design and Details
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Fasteners and Welds for Structural Connections

                                           Fasteners and Welds for Structural Connections  23

                      When the welding is to be done in the field rather than in the shop,
                    a triangular flag should be placed at the intersection of arrow and line:






                      This is important in ensuring that the weld will be made as required.
                    Often, a tail note is advisable for specifying field welds.
                      A continuous weld all around a joint is indicated by a small circle
                    around the intersection of line and arrow:






                    Such a symbol would be used, for example, to specify a weld joining a
                    pipe column to a base plate. The all-around symbol, however, should not
                    be used as a substitute for computation of the actual weld length
                    required. Note that the type of weld is indicated below the line in the
                    all-around symbol, regardless of shape or extent of joint.
                      The preceding devices for providing information with fillet welds also
                    apply to groove welds. In addition, groove-weld symbols must desig-
                    nate material preparation required. This often is best shown on a cross
                    section of the joint.
                      A square-groove weld (made in thin material) without root opening is
                    indicated by







                    Length is not shown on the welding symbol for groove welds because
                    these welds almost always extend the full length of the joint.
                      A short curved line below a square-groove symbol indicates weld con-
                    tour. Ashort straight line in that position represents a flush weld surface.
                    If the weld is not to be ground, however, that part of the symbol is usually
                    omitted. When grinding is required, it must be indicated in the symbol:







                      The root-opening size for a groove weld is written in within the symbol
                                                               1
                    indicating the type of weld. For example, a  ⁄8-in root opening for a
                    square-groove weld with a backing bar is specified by



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