TOOLS / WELDING

Welding heat input calculator

Estimate arc energy and corrected welding heat input from voltage, current, travel speed and process efficiency.

Estimate welding arc energy per millimetre.

Welding energy0.83 kJ/mm heat input

Arc energy: 1.04 kJ/mm · efficiency: 0.8 (GMAW)

Efficiency convention (TWI): SAW 1.0, SMAW/FCAW/GMAW 0.8, GTAW 0.6; other references give ranges, and ASME IX historically used 1.0. The same weld gives a different heat input under a different convention, so always check which convention the governing WPS uses. Confirm preheat and interpass limits before production welding.

Built for practical decisions

Heat input is a useful welding-process control value, but the correct efficiency convention, WPS, preheat and interpass limits must govern production work.

Important assumptions

Use the result as a planning estimate. Confirm material data, machine settings, drawing tolerances and applicable standards before production or structural work.

Quick answers about this welding heat input calculator

What does the welding heat input calculator help me decide?

Estimate arc energy and corrected welding heat input from voltage, current, travel speed and process efficiency.

Can I use the result directly for production?

Use it as a starting estimate. Verify the drawing, material grade, machine capability, tooling data and applicable standard before cutting, forming, welding or ordering material.