WELDING THEORY - OD1650 - LESSON 1/TASK 1
FIGURE 3. BASIC WELD SYMBOLS.
Basic Weld Symbols.
(1) General. Weld symbols are used to indicate the following welding processes used in
metal joining operations; whether the weld is localized or "all around"; shop or field welds; and
the contour of welds. These basic weld symbols are summarized in paragraphs (2) through (5)
below and are illustrated in figure 4 on the following page.
(2) Arc and Gas Weld Symbols. These symbols are used as shown in figure 3, view A.
(3) Resistance Weld Symbols. These symbols are used as shown in figure 3, view B.
(4) Brazing, Forge, Thermit, Induction, and Flow Weld Symbols. These welds are
indicated by using a process or specification reference in the tail of the welding symbols as
shown in figure 4, view A. When the use of a definite process is required (figure 4, view B), the
process may be indicated by one or more of the letter designations shown in Tables I and II on
the following pages. When no specification, process or other reference is used with a welding
symbol, the tail may be omitted, as shown in figure 4, view C.