Weld Throat Calculator

Inputs

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Use ASD with service loads or LRFD with factored loads.
First fillet leg size measured from the root.
mm
Second fillet leg size measured from the root. Set equal to Leg A for a standard equal-leg fillet.
mm
Length of sound weld carrying the load.
mm
Conservative reduction for root opening or fit-up gap if the weld size is not increased to compensate.
mm
Filler-metal classification sets F_EXX.
Load to compare with weld capacity. Use service load for ASD or factored load for LRFD.
N

Results

Default result
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Effective throat(a_eff)
4.243mm

Theoretical throat minus root-opening allowance.

Also computed

Theoretical throat(a)4.243mm

Weld capacity(R)61,480N

61.48 kN · 6.27 t

Utilization(U)Pass0.8133

Within weld-metal capacity.

Applied load / weld capacity.

Required equal leg(z_req)4.88mm

Equal-leg size for the entered load and root allowance.

Required throat(a_req)3.451mm

Capacity per length(R/L)614.8N/mm

Method notes 4 notes
  • For a right-angle unequal-leg fillet, theoretical throat is z1*z2 / sqrt(z1^2 + z2^2). Equal legs reduce to 0.707*z.
  • Effective throat is reduced by the entered root-opening allowance. If the weld size is increased or testing demonstrates the required throat, set the allowance to zero.
  • ASD basis uses 0.30*F_EXX and should be compared with service loads.
  • This checks weld metal only. Base metal, minimum/maximum weld size, end returns, intermittent welds, fatigue, eccentric weld-group behavior and code-specific detailing are outside this simple throat check.

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