Heat input. A free calculator, EN 1011-1 and ASME IX.
Voltage, current and travel speed: see the arc energy and the heat input at once, counted both ways.
EN 1011-1 · ISO/TR 17671-1
- Arc energy E
- — kJ/mm
- Process factor k
- —
- Travel speed used
- — mm/min · — in/min
ASME IX · QW-409.1(a)
ASME uses no k factor: the value equals the arc energy.
An indicative result. The qualified WPS and the standard that applies to your job govern.
Use Q for preheatIn Worgify the WPS holds the qualified parameters of every run, and the system works out from the standard what each procedure and welder covers.See WeldtrackBook a demo
How to read the numbers.
Arc energy is the electrical energy per millimetre of weld: voltage times current, divided by travel speed. It does not depend on the process.
Heat input is the part of that energy that actually goes into the work. EN 1011-1 estimates it with a factor k per process: 1.0 for submerged arc, 0.8 for covered electrodes, MIG/MAG and flux-cored wire, 0.6 for TIG and plasma.
ASME IX (QW-409.1) counts another way: voltage times current times 60, divided by travel speed in inches per minute, in J/in, with no k factor. So the two numbers do not compare directly: an ASME WPS and an ISO WPS for the same joint show different values.
Heat input matters where a standard makes it an essential variable — for instance when impact tests are required, under ISO 15614-1 or ASME IX. It also goes into the preheat calculation of EN 1011-2.
See also
Sources
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