Size fillet welds to Eurocode EN 1993-1-8 or AISC 360. Enter the leg size, weld length, electrode or steel grade and the applied load, and the calculator gives the effective throat, design shear strength, capacity, utilisation and a capacity table of leg size against length.
What it gives you
- Effective throat from the leg size (a = 0.707 z)
- Design shear strength of the weld metal for the chosen grade
- Capacity per millimetre and total capacity for the length
- Utilisation and pass/fail against the applied load
- Capacity table for preliminary sizing
Method and standards
For Eurocode the simplified method of EN 1993-1-8 clause 4.5.3.3 is used: the design shear strength is the ultimate tensile strength divided by the square root of three, the correlation factor and the partial factor 1.25. For AISC the LRFD strength is 0.75 times 0.6 times the electrode strength times the throat, with the directional increase available for transverse welds. Base metal checks are not included.
How to use it
- Pick the code and steel or electrode grade.
- Enter leg size, weld length and the applied force.
- Read utilisation, and use the table to compare leg sizes.
Questions engineers ask
- Is this a full weld design?
- No. It checks the weld metal in shear for the simplified method. Base metal capacity, weld group eccentricity and fatigue need separate assessment.
- Which correlation factor is used?
- The Eurocode correlation factor for the chosen steel grade, for example 0.85 for S275 and 0.90 for S355.
- Can I use it for butt welds?
- Full penetration butt welds are usually taken as at least as strong as the parent metal and are not sized here.
Need this calculation done properly, with a signed-off calculation pack or FEA behind it? Forgepoint provides mechanical design, analysis and pressure equipment engineering from Manchester, UK-wide.
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