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Weld Area Load Arithmetic

Relate weld dimensions to supplied tensile or shear stress using idealized effective-area formulas.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

In initial display units, Size of weld (s) 5, Tensile Strength (σt) 100, Weld strength (P) 35350 gives Length of weld (l) 100.

Single fillet load = 0.707×leg size×length×tensile stress; butt load = thickness×length×tensile stress.

Worked example

Enter these known values and leave the other values blank.

Size of weld (s)
5 mm
Tensile Strength (σt)
100 MPa
Weld strength (P)
35350 N
Length of weld (l)
100 mm

Assumptions and limitations

  • This is effective-area arithmetic with user-supplied stress and load, not a code-based weld design or allowable-load certification. Captured throat factors 0.707 and 1.414 approximate √(1/2) and √2. Parallel/combined fillets retain a 12.5 mm end allowance; fatigue, eccentric loading, joint quality and safety factors are excluded.
  • Select compatible units and clear the quantity to solve before supplying the remaining measurements. Rounded purchase counts cannot uniquely recover a continuous dimension. Currency choices label amounts and do not convert exchange rates.

Common questions

How can I solve for a missing measurement?

Clear that field, then enter independent known values. Lock a known measurement to preserve it while changing another value. Procurement counts are rounded upward and cannot be reversed uniquely.

References

Pounds-force per square inch use the exact international pound and inch with standard gravity, replacing the rounded captured factor. The pound-force uses the exact international pound and standard gravity instead of the rounded captured factor.

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