Welding symbols, like sign post's are informational
directors. They are placed on drawings by Welding engineers and
their purpose is to relay information to the weld operator. In
many instance's the information relayed is very simple.
Occasionally it is necessary for the engineer
to relay complicated information. Therefore it is important that
weld operators understand the symbols and are capable of interpreting
the needs of the engineer.
For the most part weld symbols are standard
throughout the world, although there are symbols that are devised
and used only by the company that devised them.
Figure 1 shows the various elements of a Weld
symbol and looks very busy. Let's break down the elements.
When we put the above elements together we
see the result in fig. 7. The finished symbol instructs the weld
operator to deposit a 1/4" fillet weld both sides of the
joint and that the preferred welding rod will be a E7018.
Figure 8 looks very similar but in this case
the symbol informs the weld operator that this is a stitch weld
. The first Dimension indicates that each weld deposit is to be
3" in length. The second dimension refers to the center to
center spacing requirement of each stitch. So in this case the
weld operator is required to deposit a series of 3" weld's
with a 3" space between each deposit ( see fig 9 ).
Supplementary symbols are often added to the
weld symbol. A supplementary symbol usually refers to pre - weld
preparation or post weld finishing. fig 9 is an example of pre
- weld preparation.
The symbol shown in figure 10 indicates that
the vertical component requires beveling prior to assembly. The
remainder of the symbol indicates that a 1/4" fillet is required
to complete the weld.This symbol would usually be accompanied
with additional notes and instruction. The additional notes would
probably reference a specific weld procedure, which would indicate
the number and sequence of multiple passes required to complete
the finished weld.
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The following illustrations show simple weld
symbols and the resulting application.
Butt Welds
Groove Joints
Lap Joints
Tee Joints
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