Plate Stress to Fillet Weld Stress

Calculate fillet weld stress from parent plate stresses

Calculation Reference
First principles

To calculate the fillet weld stress from the parent plate stresses, you can follow these steps:

1. Determine the stress components: Identify the stress components acting on the parent plate. These components typically include axial stress (σx), bending stress (σb), and shear stress (τ).

2. Determine the weld throat thickness: Measure or determine the throat thickness (t) of the fillet weld. This is the distance from the root of the weld to the theoretical intersection of the weld with the base metal.

3. Calculate the weld stress: The fillet weld stress (σw) can be calculated using the following equation:

   σw = (√(σx^2 + σb^2) + 3τ) / (2√2 * t)

   Where σx is the axial stress, σb is the bending stress, and τ is the shear stress acting on the parent plate.

4. Interpret the results: The calculated fillet weld stress represents the equivalent stress on the weld due to the combination of axial, bending, and shear stresses in the parent plate.

By following these steps, you can calculate the fillet weld stress from the parent plate stresses, taking into account the different stress components and the weld throat thickness. It is important to ensure that the calculated weld stress is within acceptable limits to ensure the integrity and strength of the weld joint.