WELDING METALLURGY / CALCULATOR
Welding Heat Input Calculator
Calculate welding heat input in kJ/mm and kJ/in for SMAW, GMAW (MIG), GTAW (TIG), and SAW welding procedure specifications (WPS).
When planning Engineering tasks, accurate numbers for Arc Voltage (Volts), Welding Current (Amps), Travel Speed (mm/sec (or 11.8 in/min)) prevent costly overages and rework. This Welding Heat Input Calculator executes (Heat Input (kJ/mm) = (Voltage × Amperage × Thermal Efficiency Factor) ÷ (Travel Speed in mm/sec × 1000)) directly in your browser, turning default inputs like Arc Voltage = 22.5 Volts into an immediate 0.59 kJ/mm benchmark.
Default baseline with Arc Voltage = 22.5 Volts yields 0.59 kJ/mm (heat input energy).
MATHEMATICAL FORMULA
Heat Input (kJ/mm) = (Voltage × Amperage × Thermal Efficiency Factor) ÷ (Travel Speed in mm/sec × 1000)
Computed directly from Arc Voltage (Volts), Welding Current (Amps), Travel Speed (mm/sec (or 11.8 in/min)) with zero server latency so Engineering practitioners can verify how Arc Voltage drives heat input energy.
Worked Real-World Example
Suppose you are running a Welding Heat Input Calculator calculation with default baseline inputs: Arc Voltage = 22.5 Volts, Welding Current = 165 Amps, Travel Speed = 5 mm/sec (or 11.8 in/min), Process Thermal Efficiency (η) = 0.8 factor (0.8 MIG / 0.6 TIG / 0.85 Stick). Applying the equation (Heat Input (kJ/mm) = (Voltage × Amperage × Thermal Efficiency Factor) ÷ (Travel Speed in mm/sec × 1000)), the calculator yields a primary result of 0.59 kJ/mm (heat input energy), along with secondary breakdown details of 15.1 kJ/inch (165A @ 22.5V at 5 mm/s).
Assumptions, Tolerances & Limitations
Mechanical power transmission, CNC machining feeds, and structural beam deflection calculations assume rigid workholding, standard alloy elastic moduli (E), and proper lubrication. Always apply an engineering Factor of Safety (FoS) appropriate for dynamic or shock loads. Specifically for Welding Heat Input Calculator, ensure Arc Voltage and Process Thermal Efficiency (η) are measured in consistent Volts before finalizing orders or specifications.
Methodology & Standards: Formulated for Engineering reference using (Heat Input (kJ/mm) = (Voltage × Amperage × Thermal Efficiency Factor) ÷ (Travel Speed in mm/sec × 1000)) across Arc Voltage (Volts), Welding Current (Amps), Travel Speed (mm/sec (or 11.8 in/min)).
STEP-BY-STEP GUIDE
How to use the Welding Heat Input Calculator
Use the three steps below to configure Arc Voltage (Volts), Welding Current (Amps), Travel Speed (mm/sec (or 11.8 in/min)) and interpret the heat input energy for Welding Heat Input Calculator.
Start by setting Arc Voltage = 22.5 Volts and related Engineering inputs.
Confirm unit consistency across Arc Voltage (Volts), Welding Current (Amps), Travel Speed (mm/sec (or 11.8 in/min)).
Compare the computed 0.59 kJ/mm baseline against your project requirements.
FREQUENTLY ASKED QUESTIONS
What is the primary calculation performed by the Welding Heat Input Calculator?
The Welding Heat Input Calculator calculates Calculate welding heat input in kJ/mm and kJ/in for SMAW, GMAW (MIG), GTAW (TIG), and SAW welding procedure specifications (WPS). according to the verified formula Heat Input (kJ/mm) = (Voltage × Amperage × Thermal Efficiency Factor) ÷ (Travel Speed in mm/sec × 1000).
How do I ensure maximum accuracy with this calculator?
Always measure actual physical dimensions and parameters rather than nominal estimates, keep units consistent, and include recommended safety or waste allowances.
Can I copy and share the calculation results?
Yes. Click the 'Copy result' button to copy the complete formatted calculation and input record directly to your clipboard for job estimates or documentation.