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Steel Designers' Manual - 6th Edition (2003)
708 Welds and design for welding
Fig. 24.14 Weld in compression
Fig. 24.15 Weld with moment
Table 24.2 Design strength, Pw, of fillet welds
24.7.2 Strength
compression
single sided fillet
weld not to be
used
Steel grade Electrode classification Other
types
35 42 50
c
(N/mm2 ) (N/mm2 ) (N/mm2 ) (N/mm2 )
S275 220 220 a 220 a 0.5Ue but
S355 220 b 250 250 a £0.55Us
S460 220 b 250 b 280
a Over-matching electrodes
b Under-matching electrodes. Not to be used for partial penetration butt welds.
c Ue = minimum tensile strength of electrode as specified in the relevant product standard
Us = minimum tensile strength of the parent metal
The design strengths of fillet welds are given in Table 24.2.
BS 5950-1: 1990 stated that where a member is connected to a plate by a symmetrical
fillet weld the strength of the weld could be taken as equal to the strength
of the parent metal, if the weld was made with a suitable, the sum of the throat sizes
was not less than the connected plate thickness, and the weld was principally subject
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