WELDING THEORY - OD1650 - LESSON 1/TASK 1
(b) When resistance seam welding extends for the full distance between abrupt
changes in the direction of the welding, no length dimension need by shown on the welding
(c) When resistance seam welding extends less than the distance between abrupt
changes in the direction of the welding, or less than the full length of the joint, the extent will be
dimensioned (figure 17, view D, on the previous page).
(4) Pitch of Resistance Seam Welds. The pitch of intermittent resistance seam welding
will be shown as the distance between centers of the weld increments. It will be shown to the
right of the length dimension (figure 17, view E).
(5) Termination of Intermittent Resistance Seam Welding. When intermittent resistance
seam welding is used by itself, the symbol indicates that increments will be located at the ends of
the dimensioned length. When used between continuous resistance seam welding the symbol
indicates that spaces equal to the pitch minus the length of one increment will be left at the ends
of the dimensional length. Separate symbols will be used for intermittent and continuous
resistance seam welding when the two are used in combination.
(6) Flush Resistance Seem Welded Joints. When the exposed surface of one member of a
resistance seam welded joint is to be flush, that surface will be indicated by adding the flush
contour symbol (figure 17, view F).
Flash or Upset Welds.
(1) General. Flash or upset weld symbols have no arrow side or other side significance
in themselves, although supplementary symbols used in conjunction with them may have such
significance. The weld symbols for flash or upset welding will be centered on the reference line.
Dimensions will not be shown on welding symbol.
(2) Surface Contour of Flash or Upset Welds. The contour symbols (refer to figure 13,
view C, on page 29) for flash or upset welds are indicated (refer to figure 14, view E, on page
31) in the same manner as that for fillet welds.