1. What is the Leg of Weld?

The Leg of Weld is the distance from the joint root to the toe of the weld in a fillet weld. It represents the size of the weld and is a critical parameter in weld design and inspection.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \pi \) — Archimedes' constant (approximately 3.14159)
• \( \cos(\pi/4) \) — Cosine of 45 degrees (approximately 0.707107)
• Throat Thickness — The shortest distance from the root to the face of the weld

Explanation: For a 45-degree fillet weld, the relationship between leg size and throat thickness is defined by this trigonometric relationship.

3. Importance of Leg of Weld Calculation

Details: Accurate calculation of weld leg size is crucial for determining weld strength, ensuring proper load distribution, and meeting design specifications in structural welding applications.

4. Using the Calculator

Tips: Enter the throat thickness of the weld in meters. The value must be greater than zero. The calculator will compute the corresponding leg size for a 45-degree fillet weld.

5. Frequently Asked Questions (FAQ)

Q1: Why is π/4 used in the formula?
A: π/4 radians equals 45 degrees, which is the standard angle for fillet welds where the legs are equal.

Q2: What is the typical range for weld leg sizes?
A: Weld leg sizes typically range from 3mm to 25mm depending on the application and material thickness.

Q3: Can this formula be used for unequal leg fillet welds?
A: No, this formula is specifically for equal leg fillet welds (45-degree welds).

Q4: How accurate is this calculation?
A: The calculation is mathematically precise for ideal 45-degree fillet welds with perfect geometry.

Q5: What units should be used for input?
A: The calculator uses meters, but you can convert from millimeters by dividing by 1000 (e.g., 6mm = 0.006m).