Length of Bottom Weld Given Axial Load on Weld Calculator

Formula Used:

\[ \text{Length of Bottom Weld} = \frac{\text{Axial Load on Weld}}{\text{Shear Stress} \times 0.707 \times \text{Thickness of Plate}} - \text{Length of Top Weld} \] \[ L2 = \frac{P_{\text{weld}}}{\tau \times 0.707 \times t_{\text{plate}}} - L_{\text{top weld}} \]

Axial Load on Weld (Pweld):

Shear Stress (τ):

Thickness of Plate (tplate):

Length of Top Weld (Ltop weld):

Length of Bottom Weld (L2):

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1. What is Length of Bottom Weld Calculation?

The Length of Bottom Weld calculation determines the required length of the bottom weld segment when subjected to axial loading, based on shear stress capacity and plate thickness parameters.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ L2 = \frac{P_{\text{weld}}}{\tau \times 0.707 \times t_{\text{plate}}} - L_{\text{top weld}} \]

Where:

\( L2 \) — Length of Bottom Weld (m)
\( P_{\text{weld}} \) — Axial Load on Weld (N)
\( \tau \) — Shear Stress (Pa)
\( t_{\text{plate}} \) — Thickness of Plate (m)
\( L_{\text{top weld}} \) — Length of Top Weld (m)
0.707 — Conversion factor for weld throat thickness

Explanation: The formula calculates the required bottom weld length by distributing the total axial load between top and bottom welds based on their shear capacity.

3. Importance of Weld Length Calculation

Details: Proper weld length calculation ensures structural integrity, prevents weld failure under load, and optimizes material usage in welded connections.

4. Using the Calculator

Tips: Enter axial load in Newtons, shear stress in Pascals, plate thickness in meters, and top weld length in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is the 0.707 factor used in the formula?
A: The 0.707 factor accounts for the effective throat thickness in fillet welds, converting leg length to throat thickness.

Q2: What is the typical shear stress value for welds?
A: Shear stress values vary by material and welding process, typically ranging from 140-400 MPa for structural steel welds.

Q3: Can this calculator be used for different weld types?
A: This formula is specifically designed for fillet welds subjected to axial loading. Other weld types may require different calculations.

Q4: What if the calculated bottom weld length is negative?
A: A negative result indicates the top weld alone is sufficient to carry the load, or that input values may need verification.

Q5: Are there safety factors to consider?
A: Yes, appropriate safety factors should be applied to calculated weld lengths based on applicable design codes and safety requirements.