Welding Calculator

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Transverse fillet welds resist tension; parallel fillets resist shear; butt welds are loaded along the weld axis.
Total effective weld length, not including start/stop craters.
mm
For fillet welds, the leg size. For butt welds, the throat (plate thickness).
mm
Permissible tensile stress of the weld metal. Typical structural steel weld metal: 140-170 MPa.
MPa
Permissible shear stress. Often taken as about 0.6 x tensile strength for steel.
MPa
Weld strength (P)
127.26kN

Allowable load the joint can carry based on weld geometry and material properties

Strength per mm of weld0.848kN/mm
Effective throat5.66mm

Allowable weld strength: 127.26 kN

  • The effective throat is 5.66 mm (0.707 x leg size), which is the critical dimension governing load capacity.
  • This joint carries 0.848 kN per mm of weld length. Use this to scale to any other length.

Next stepCompare this capacity with the design load. Apply a safety factor per your code (e.g. AWS D1.1, BS EN 1993-1-8) and verify the base metal is not the limiting element.

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