eng.heat-input-welding Calculator
Calculates welding heat input (kJ/mm) from voltage, current, and travel speed, and checks against preheat and interpass temperature requirements. Heat input above 2.5 kJ/mm causes excessive HAZ softening in high-strength steel — below 0.5 kJ/mm risks hydrogen cracking.
Inputs
- Voltage V
- Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
- Current A
- Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
- Travel Speed Mm Min
- Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
- Efficiency Factor
- Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
- heat input (kJ/mm)
- The value at the specified point or condition.
- arc power (kW)
- Reference formula or conversion factor shown for context.
- travel speed (mm/s)
- The computed rate of movement or processing.
- HI = η×V×I / S
- Reference formula or conversion factor shown for context.
- low HI (<0.5 kJ/mm)
- Reference formula or conversion factor shown for context.
- high HI (>2.5 kJ/mm)
- Reference formula or conversion factor shown for context.
current heat power engineering input