Skip to main content
    Pro Reference Trades Suite
    Sign InCreate accountAdminUpgrade
    All answers

    Welding Heat Input Calculator (kJ/mm)

    Why does travel speed change heat input so much?

    Heat input is inversely proportional to travel speed. Slower travel puts more energy into each millimeter of weld, raising heat input, while faster travel lowers energy per unit length.

    Run the numbers for your project

    Use the Welding Heat Input Calculator (kJ/mm) to get an exact answer for your inputs.

    Open the calculator

    Related questions

    Estimates and general guidance only. Verify against your local code and AHJ before any installation. Gas, electrical, and refrigerant work is hazardous to untrained users.

    Pro launch updates

    Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.