Civil Engineering Reference
In-Depth Information
4
Welding symbols 2
Fillet and edge welds, backing run or weld,
flare groove and bevel welds, and plug or
slot weld
The symbols for fillet and edge welds, backing run or weld,
flare groove and bevel, and plug or slot welds are shown in
Fig.
4.1(a-f)
.
Figure 4.1(a)
illustrates a
fillet weld
. Unless otherwise indicated,
the leg lengths are normally equal.
Figure 4.1(b)
shows an
edge weld
. The ISO and AWS symbols are
fairly similar and are drawn above and below the reference line
respectively, both indicating a weld on the arrow side. However,
there is no possibility of confusion because the edge weld can only
be deposited on one side.
Figure 4.1(c)
shows a
backing run or weld
. This is not a weld in
its own right, as this symbol is not used on its own. It is deposited
on the opposite side of the joint to the main weld, so both sides must
be accessible.
The AWS standard includes symbols for flare-V-groove and flare-
bevel-groove welds. A
flare-V-groove weld
, shown in
Fig. 4.1(d)
, is
a weld in a groove formed by two members with curved surfaces. A
flare-bevel-groove weld
, shown in
Fig. 4.1(e)
, is a weld in a groove
formed by a member with a curved surface in contact with a planar
member. The commonest application for these welds is in the
welding of reinforcing bars.
Figure 4.1(f )
shows a
plug or slot weld
, which is a circular or
elongated hole completely filled with weld metal. The size of the
hole should be restricted to avoid excessive distortion and unnec-
essary consumption of filler metal.
