Steel · Connections: bolts & welds
Fillet weld group calculator
Fillet weld capacity per mm and an eccentric weld group (two lines or all-round) by the elastic method.
Standard: AS 4100 Cl 9.7.3 · AS/NZS 1554
Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Fillet leg size | 6 | mm |
| Weld metal fuw | 490 | MPa |
| Weld category | SP (φ = 0.8) | |
| Length reduction kr | 1 | |
| Weld pattern | Two vertical lines | |
| Width b | 150 | mm |
| Height h | 250 | mm |
| Vertical load V* | 150 | kN |
| Eccentricity from group centre | 120 | mm |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| Throat tt = s/√2 | 4.24 | mm |
| φvw per mm | 0.998 | kN/mm |
| Total weld length | 500 | mm |
| Ip (unit throat) | 5,415 | ×10³ mm³ |
| Torque V*·e | 18.00 | kNm |
| Max force per mm | 0.689 | kN/mm |
| Utilisation | 69 | % |
- ✓ v* ≤ φvw at the critical point
Method, formulas and assumptions
- vw = 0.6 fuw tt kr (Cl 9.7.3.10), φ = 0.8 SP / 0.6 GP
- Weld treated as lines of unit throat; centroid and Ip by numerical integration
- Force per mm = direct V/Lw plus T·r/Ip perpendicular to r, maximum over all lines and ends
- E49XX consumables: fuw = 490 MPa
Related steel calculators
- Bolt design & bolt group — Bolt shear, tension, bearing and tear-out; eccentric bolt group by the elastic method.
- Bolt in shear & ply bearing — Single bolt shear capacity with threads in / excluded from shear planes, ply bearing and end tear-out; bolt…
- Bolt in combined tension & shear (with prying) — Bolt tension capacity, prying allowance and the elliptical shear–tension interaction.
- Friction-type bolted joint (8.8/TF) — Slip resistance with faying-surface slip factor, hole type factor and tension interaction.
- Fin plate (shear tab) connection — Single vertical line of bolts with eccentricity, plate shear yield and rupture, block shear, plate bending…
- Double angle web cleat — Two angle cleats bolted to the beam web (double shear, eccentric) and to the support (single shear), with…
- T-stub in tension with prying (Thornton) — Available bolt tension of a T-stub flange including prying; thickness for no prying, α′ and Q.
- Column cap plate & beam web bearing — Beam sitting on a column cap plate: stiff bearing length with dispersion through flange and plate, web…
- Load-bearing web stiffener — Bearing yield of web plus stiffener pair, and buckling of the stiffener with the effective web strip as a…
- Bracing gusset (Whitmore, Thornton, block shear) — Whitmore effective width, gusset tension yield and fracture, compression buckling over the Thornton length…
For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.