WELDING THEORY - OD1650 - LESSON 1/TASK 1
(4) Extent and Number of Arc Spot Welds.
(a) When arc spot 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 10, view D, on the previous page).
(b) When a definite number of arc spot welds is desired in a certain joint, the number
will be shown in parentheses either above or below the weld symbol (figure 10, view E).
(5) Details of Arc Seam Welds. Spacing, extent, orientation, and location of arc seam
welds cannot be shown on the welding symbols. These data will be shown on the drawing.
(6) Flush Arc Spot and Arc Seam Welded Joints. When the exposed surface of one
member of an arc spot or arc seam welded joint is to be flush, that surface will be indicated by
adding the flush contour symbol (figure 10, view F), in the same manner as that for fillet welds.
(a) Dimensions of groove welds will be shown on the same side of the reference line
as the weld symbol.
(b) When no general note governing the dimensions of groove welds appears on the
drawing, the dimensions for double groove welds will be shown as follows:
1 When both welds have the same dimensions, one or both may be dimensioned
(figure 11, view A, on the following page).
2 When the welds differ in dimensions, both welds will be dimensioned (figure
11, view B).
(c) When a general note governing the dimensions of groove welds appears on the
drawing, the dimensions of double groove welds will be indicated as follows: