Welding engineering, without the guesswork

Most welding calculators online return a single number with no context. Engineers and inspectors need more than that: they need the formula that was used, the variables that went into it, the rounding, the unit conversion and a defensible interpretation of the result.

HeatInput takes the opposite approach. Every calculation is transparent and traceable, so the output can be used to support welding procedure specifications, qualification records and inspection reports.

Standards referenced

• ISO 18491:2026 — measurement of parameters used to calculate arc energy for arc welding processes.
• ISO 15614-1 — qualification of welding procedures by welding procedure testing for steels and nickel alloys.
• AWS D1.1/D1.1M — Structural Welding Code — Steel; requirements covering design, fabrication, qualification and inspection of welded structural steel.
• ASME BPVC Section IX — qualification of welding, brazing and fusing procedures and personnel.

Where this is going

The current release covers three core welding calculations: Heat Input, Arc Energy and Travel Speed. Planned additions include Preheat, PWHT, hydrogen, cooling time, carbon equivalent, ferrite number, hardness conversion and weld volume modules, alongside project management, WPS management, welder qualification tracking and inspection reporting.