Fillet Weld Calculator (EC3) | StrokeForge Engineering

Load Type

Throat thickness a

mm

Effective throat of fillet weld

Weld length l

mm

Effective length (each weld)

Number of welds n

Symmetric welds in joint

Applied force F

kN

Design value (factored)

Base material

γ_M2 (partial factor)

EN 1993-1-8 §2.2

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Enter values

Weld throat area A_w

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Applied stress σ_w

—

Design resistance f_w,Rd

—

Utilisation η

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Resistance force F_Rd

—

Reserve capacity

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Weld geometry invalid: effective length must be ≥ 6a and ≥ 30 mm (EC3 §4.5.1).

Throat thickness a < 3 mm — minimum recommended for structural welds.

Utilisation > 80% — consider increasing throat thickness or weld length.

Effective length used: l_eff = l − 2a (start/stop deduction per EC3 §4.5.1).

Per ČSN EN 1993-1-8 §4.5.3.3 (simplified method):