WELDING THEORY - OD1650 - LESSON 1/TASK 1
(3) Extent, Location, and Orientation of Surfaces Built Up by Welding. When the entire
area of a plane or curved surface is to be built up by welding, no dimension other than size need
be shown on the welding symbol. If only a portion of the area of a plane or curved surface is to
be built up by welding, the extent, location, and orientation of the area to be built up will be
indicated on the drawing.
(a) The following welding symbols are intended to be used for light gage metal joints
involving the flaring or flanging of the edges to be joined. These symbols have no arrow or
other side significance.
(b) Edge flange welds will be shown by the edge flange weld symbol (figure 14, view
B, on the previous page).
(c) Corner flange welds will be shown by the corner flange weld symbol (figure 14,
(2) Dimensions of Flange Welds.
(a) Dimensions of flange welds will be shown on the same side of the reference line
as the weld symbol.
(b) The radius and the height above the point of tangency will be indicated by
showing both the radius and the height separated by a plus mark and placed to the left of the
weld symbol. The radius and the height shall read in that order from left to right along the
reference line (figure 14, view D).
(c) The size of flange welds will be shown by a dimension placed outward of the
flange dimensions (figure 14, view D).
(d) Root opening of flange welds will not be shown on the welding symbol. If it is
desired to specify this dimension, it will be shown on the drawing.