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Re: question on welding values

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Yes, the strength of a fillet weld is 50% greater transversely than longitudinally.  Historically AISC has used the lower value in all directions to make life simple.  However, AWS D1.1 has had the formula you show below for a very long time for fillet welds loaded at any angle other than zero.

Thomas Hunt, S.E.
ABS Consulting

"Briceno, Cairo" <Cairo.Briceno(--nospam--at)>

09/16/2005 10:33 AM

Please respond to

question on welding values

Excerpt from AISC Specifications for structural steel buildings:
“Alternatively, for fillet welds loaded in-plane the design strength, fRn and the
allowable strength, Rn/_, of welds is permitted to be determined as follows:
f = 0.75 (LRFD) _ = 2.00 (ASD)
(a) For a linear weld group loaded in-plane through the center of gravity
Rn = Fw Aw (J2-4)
Fw = 0.60FEXX (1.0 + 0.50 sin 1.5 θ)               (J2-5)
FEXX = electrode classification number, ksi (MPa)
θ  = angle of loading measured from the weld longitudinal axis, degrees
Aw = effective area of the weld, in.2 (mm2) “
This allows a 50% increased when the weld is 90 loaded with respect to the weld longitudinal axis. Can this increase be used for a force that is perpendicular to the plane of the weld? Does anybody have an insight or opinions about this topic.