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RE: Fillet Welds

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Title: RE: Fillet Welds

>AISC Table J2.5 lists allowable stress on welds for various types of welds.
>Fillet weld has two types. a) Shear on effective area, and b) Tension or
>compression parallel to axis of weld.  How do you discribe each in terms of
>real world applications?

Almost all applications of loading induce shear in fillet welds on the effective area. Tension or compression parallel to the axis of the weld could result in a case such as a fillet welded in a built-up box member subject to compression or tension. However, even in that case, the weld metal usually has a strength that exceeds that of the base metal, so the base metal values will be used in the member design, not the weld metal values.

>Also, when a cantilever beam is welded with a fillet weld all around to a
>column, would you consider the weld at the tension flange subject to
>horizontal shear or tension perpendicular to the weld axis (not listed in
>AISC Table J2.5) in addition to the vertical shear.

The resultant effect on the weld is shear on the effective throat in each case. Shear along the axis is treated in Section J2.4. Shear perpendicular to the axis is treated in Appendix J2.4 (LRFD) such that the increased strength for transverse loading can be recognized in the design. The resultant load on the fillet weld and angle of action can be determined if it makes sense time-wise to do so. However, if you've only got one of them, it's a lot of calculation to use Appendix J2.4 when a slightly larger weld size can be determined without the increase using Section J2.4.