WELDING THEORY - OD1650 - LESSON 1/TASK 1
(3) Welds on both sides of the joint will be shown by placing weld symbols on both sides
of the reference line, toward and away from the viewer (figure 7, view C, on the previous page).
(4) Resistance spot, resistance seam, flash .and upset weld symbols have no arrow side or
other side significance in themselves, although supplementary symbols used in conjunction with
these symbols may have such significance. For example: the flush contour symbol (refer to
figure 3, view C, on page 9) is used in conjunction with the spot and seam symbols (figure 7,
view D) to show that the exposed surface of one member of the joint is to be flush. Resistance
spot, resistance seam, flash and upset weld symbols will be centered on the reference line (figure
7, view D).
References and General Notes.
(1) Symbols may be used without specification, process or other references in the
(a) A note such as the following appears on the drawing: "Unless otherwise
designated, all welds are to be made in accordance with Specification No ....."
(b) The welding procedure to be used is prescribed elsewhere.
(2) General notes, such as the following, may be placed on a drawing to provide detailed
information pertaining to the predominating welds, and this information need not be repeated on
(a) "Unless otherwise indicated, all fillet welds are 5/16 inch size."
(b) "Unless otherwise indicated, root openings for all groove welds are 3/16 inch."
Weld-All-Around and Field Weld Symbols.
(1) Welds extending completely around a joint will be indicated by means of the weld-
all-around symbol (refer to figure 4, view D, on page 10).