Figure 3-43.Standard welding symbol.
Handling and Care of Drawings
Special care should be exercised in the handling of
drawings. When they are not being used, keep them on
a rack or in another assigned place of storage. Drawings
are valuable, and they may be difficult or impossible to
replace if they are lost or damaged.
Now, we will discuss some special symbols. These
are symbols a welder must be able to read and to
understand how they are used to convey information.
six views (top, front, left side, right side, back, and
bottom). Most objects, such as the steel part shown in
figure 3-41, can be sufficiently described using three
views: top, front, and right side. For the object shown in
figure 3-41, orthographic drawings of the top, front, and
right-side views are shown in figure 3-42.
Notice the placement of the views shown in figure
3-42. This is a standard practice that you should be
aware of when reading orthographic drawings. By this
standard practice, the top view is always placed above
the front view and the right-side view is placed to the
right of the front view. When additional views are
needed, the left side is always drawn to the left of the
front view and the bottom is drawn below the front view.
Placement of the back view is somewhat flexible; how-
ever, it is usually drawn to the left of the left-side view.
When reading and understanding the different ortho-
graphic views, you find it is sometimes helpful to pre-
pare a pictorial sketch. You can find a discussion of
sketching in Blueprint Reading and Sketching,
NAVEDTRA 10077-F1 .
Think of drawings as a form of communication.
They are intended to help you understand all the neces-
sary information you need to fabricate and assemble an
object regardless of the complexity. It is important that
you learn to read drawings.
Special symbols are used on a drawing to specify
where welds are to be located, the type of joint to be
used, as well as the size and amount of weld metal to be
deposited in the joint. These symbols have been stan-
dardized by the American Welding Society (AWS). You
will come into contact with these symbols anytime you
do a welding job from a set of blueprints. You need to
have a working knowledge of the basic weld symbols
and the standard location of all the elements of a welding
A standard welding symbol (fig. 3-43) consists of a
reference line, an arrow, and a tail. The reference line
becomes the foundation of the welding symbol. It is
used to apply weld symbols, dimensions, and other data
to the weld. The arrow simply connects the reference
line to the joint or area to be welded. The direction of
the arrow has no bearing on the significance of the
reference line. The tail of the welding symbol is used
only when necessary to include a specification, process,
or other reference information.
The term weld symbol refers to the symbol for a
specific type of weld. As discussed earlier, fillet, groove,
surfacing, plug, and slot are all types of welds. Basic
weld symbols are shown in figure 3-44. The weld
Figure 3-44.Basic weld symbols.