Effective throat
a = 0.707 leg size
Structural calculator
Weld Strength Calculator
Check weld capacity from leg size, length, and allowable shear stress.
Calculator
Enter structural values
Select units beside each input. Results update automatically.
Result
About this calculator
How it works
Fillet weld capacity is estimated from effective throat area and allowable shear stress. Final weld design depends on code requirements and load direction.
Formulas
Formulas used
Throat area
A = a L
Capacity
P = A allowable stress
Worked example
Example calculation
Capacity
6 mm fillet, 100 mm long, 120 MPa allowable gives 50.9 kN
Guide
How to use this calculator
- Enter the relevant load, stress, geometry, material, or member values.
- Select units beside each input where unit menus are shown.
- Use the highlighted result for screening, then check assumptions before design use.
Reference
What the results mean
Weld capacity
Estimated allowable load based on throat shear.
Throat area
Effective weld area resisting shear.
Assumptions and limits
Before using the result
- These are simplified elastic or empirical checks for early-stage engineering review.
- Final structural design requires correct boundary conditions, load paths, code checks, material data, factors of safety, and professional review.
- Complex tools here provide key values or simplified estimates rather than a full structural analysis model.
FAQ
Weld Strength Calculator questions
Are these results suitable for final structural design?
Use these calculators for education, screening, and early checks only. Final structural design must follow applicable codes, load combinations, safety factors, material data, and qualified engineering review.
Why can real structures differ from these results?
Real structures include boundary conditions, imperfections, connection behavior, load eccentricity, dynamics, residual stress, buckling modes, fatigue, and code-specific requirements.
Can I use different units?
Yes. Select units beside inputs where menus are shown. Values are converted internally before solving.
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