Design of Fillet Welds According to EN 1993-1-8

Technical Article

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A fillet weld is the most common weld type in steel building construction. According to EN 1993‑1‑8, (1) [1], fillet welds may be used for connecting structural parts where the fusion faces form an angle between 60° and 120°.

The effective throat thickness a of a fillet is generally assumed to be the height of the triangular axis (isosceles or not isosceles) that is measured up to the theoretical root point, see Figure 01.

[1] , the ultimate limit state of fillet welds is usually determined by the directional method or the simplified method. The direction-related method is shown below.

The applied stress is assumed to be distributed uniformly over the seam cross-section and leads to the following normal and shear stresses as shown in Figure 02:

  • σ normal stress perpendicular to the weld axis
  • σ || Normal stress parallel to the weld axis
  • τ Shear stress (in the plane of the fillet weld area) perpendicular to the weld axis
  • τ || Shear stress (in the plane of the fillet weld area) parallel to the weld axis

[2] .

Material: S235, f u = 36.0 kN / cm², β w = 0.8
Internal forces: V z = 350 kN


[1] Eurocode 3: Design and construction of steel structures - part 1-8: Design of connections; EN 1993-1-8: 2005 + AC: 2009
[2] Petersen, C .: Steel Structures, 4. Edition. Wiesbaden: Springer Vieweg, 2013


Fillet weld Weld Weld stress Weld seam design Deformation check



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