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Welding Heat Input Calculator (ASME / AWS)

Calculate arc welding heat energy input in kJ/mm from volts, amps and speed.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Formula: (Volts × Amps × 60 × η) / (Travel Speed × 1000). Complies with ASME Section IX guidelines.

How to use it (step by step)

  1. 1Fill in the boxes: “Arc Voltage (Volts)”, “Welding Current (Amps)”, “Travel Speed (mm/min)”, “Process Efficiency Factor (η)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Pace / speed
Speed = distance per hour (km/h). Pace = time per distance (minutes per km), common in running.
Daily rate factor (261 / 313 / 365)
The number of paid days in a year your company uses to turn a monthly salary into a daily rate: 261 for Mon–Fri, 313 for Mon–Sat, 365 if rest days and holidays are paid too.

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