Length of Parallel Fillet Weld given Shear Stress and Weld Cut Angle Calculator

Weld Length Formula:

\[ L = \frac{P_f \times (\sin(\theta) + \cos(\theta))}{h_l \times \tau} \]

Load on Weld (P_f):

Weld Cut Angle (θ):

Leg of Weld (h_l):

Shear Stress (τ):

Tolerance:

Weld Length (L):

1. What is Length of Parallel Fillet Weld?

Definition: This calculator determines the required length of a parallel fillet weld based on applied load, weld geometry, and material properties.

Purpose: It helps engineers and welders ensure weld joints have sufficient length to withstand applied loads without failure.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ L = \frac{P_f \times (\sin(\theta) + \cos(\theta))}{h_l \times \tau} \]

Where:

\( L \) — Length of weld (meters)
\( P_f \) — Load on weld (Newtons)
\( \theta \) — Weld cut angle (degrees)
\( h_l \) — Leg of weld (meters)
\( \tau \) — Shear stress in weld material (Pascals)

Explanation: The formula accounts for both the normal and shear components of the applied load relative to the weld orientation.

3. Importance of Weld Length Calculation

Details: Proper weld length calculation ensures structural integrity, prevents joint failure, and meets safety standards while avoiding excessive material use.

4. Using the Calculator

Tips: Enter the load in Newtons, angle in degrees (0-90), weld leg size in meters, shear stress in Pascals, and optional tolerance percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical shear stress value for welds?
A: Common values range from 70-140 MPa for structural steel welds, but always consult material specifications.

Q2: How does weld angle affect the required length?
A: The angle affects load distribution - 45° typically requires the shortest weld length for a given load.

Q3: What is the weld leg size?
A: It's the distance from the joint root to the toe of the weld, equal to the fillet size for equal-leg welds.

Q4: Why include a tolerance percentage?
A: Tolerance accounts for variations in material properties, workmanship, and safety factors (default ±5%).

Q5: Can this be used for other weld types?
A: This formula is specific to parallel fillet welds. Other weld configurations require different calculations.