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Weld Strength (AISC)

Fillet Weld Shear · φRn · E70XX · Throat

When to use: Determine the design shear strength of a fillet weld per AISC 360-16 §J2.4 (LRFD). The strength depends on the electrode classification FEXX, the weld leg size w (which sets the effective throat te = 0.707·w), and the total weld length L. Compare the design capacity φRn against the required shear Ru to verify the joint.

Weld & Loading
in
applied
kip
Key Formulas
te = 0.707·w
Fnw = 0.6·FEXX
φRn = φ·0.6·FEXX·0.707·w·L
φ = 0.75 (LRFD)
E70XX → FEXX = 70 ksi
Design Strength φRn
66.81
kip
Results
Effective Throat te0.1767 in
Fnw = 0.6·FEXX42.0 ksi
Strength per Inch φrn5.568 kip/in
Total Design Strength φRn66.81 kip
Applied Shear Ru40.00 kip
DCR (Ru / φRn)0.599
✓ WELD PASS
Ru ≤ φRn · DCR 0.599
References
AISC 360-16 §J2.4 — weld strength
φ = 0.75 (LRFD shear on welds)
AWS D1.1 — electrode classification
AISC Table J2.4 — minimum fillet size