Mechanical & Civil Engineering
Butt Weld Tensile & Fatigue Strength Calculator
Estimate full-penetration butt weld tensile capacity and fatigue-allowable stress range.
Your inputs
Change any value to update the result instantly.
Tensile capacity
75,000 N
Fatigue-allowable stress
75 MPa
Weld cross-section
500 mm²
Allowable tensile stress
150 MPa
What this calculator does
Butt Weld Tensile & Fatigue Strength Calculator: Applies the standard shop-floor or joint-design relationship so the force, speed, allowance or strength can be worked out from the process inputs.
What your result means
The headline figure is the process setting or joint strength implied by your inputs. Treat it as a starting point to validate against the tool maker's data and a trial part.
Formula and working
P = t × w × σ_allow; σ_fatigue = σ_allow × fatigueFactor
- 1
Collect the inputs
Plate thickness = 10 mm; Weld width = 50 mm; Allowable tensile stress = 150 MPa; Fatigue reduction factor = 0.5
- 2
Apply the formula
P = t × w × σ_allow; σ_fatigue = σ_allow × fatigueFactor
- 3
Result
Tensile capacity = 75,000 N
Frequently asked questions
Symbols and assumptions
- thickness
- Plate thickness (mm)
- width
- Weld width (mm)
- allowStress
- Allowable tensile stress (MPa)
- fatigueFactor
- Fatigue reduction factor
- • Nominal tooling, material and process conditions are assumed; machine, tool-wear and lubrication effects vary in practice.
- • Recommended cutting data always sits inside the tool maker's published envelope, which takes priority.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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