Heat Input Calculator

To calculate heat input, multiply the welding current by the voltage, multiply by the travel speed, and divide by the weld length.

The Heat Input Calculator is an essential tool for welders and engineers to measure the amount of energy delivered during the welding process. By calculating heat input, you can optimize weld quality, reduce material deformation, and ensure compliance with welding standards such as ASME IX.

This tool is invaluable for structural welding, pressure vessels, and precision welding projects. Use it to calculate the energy input in kilojoules per millimeter (kJ/mm) for accurate results.

Formula

Hi = A ∗ V ∗ S / L

Variable	Description	Unit
Hi	Heat Input	kJ/mm
A	Welding current (amperes)	Amperes (A)
V	Voltage	Volts (V)
S	Travel speed	mm/s
L	Weld length	mm

Solved Calculations

Example 1: A welder uses a current of 200 amperes, a voltage of 25 volts, and a travel speed of 10 mm/s for a weld length of 100 mm.

Step	Calculation	Result
Input values	$A = 200, V = 25, S = 10, L = 100$	–
Heat input calculation	$Hi = (200 ∗ 25 ∗ 10) / 100$	50 kJ/mm

Example 2: For a welding process with 150 amperes, 20 volts, 5 mm/s travel speed, and a weld length of 200 mm:

Step	Calculation	Result
Input values	$A = 150, V = 20, S = 5, L = 200$	–
Heat input calculation	$Hi = (150 ∗ 20 ∗ 5) / 200$	7.5 kJ/mm

What is Heat Input Calculator?

The Heat Input Calculator is an essential tool used to calculate the precise amount of heat energy supplied during processes such as welding or thermal operations.

It aids engineers, fabricators, and welders in determining the efficiency and safety of their procedures by factoring in variables like current, voltage, and travel speed. This ensures adherence to industry standards, such as ASME IX, while optimizing performance.

By inputting key parameters—such as welding voltage, amperage, and travel speed—users can easily compute heat input in units like kJ/mm or kJ/inch.

For instance, this tool is ideal for assessing heat input in high heat welding tasks or comparing different materials like steel. Its versatility extends to formats like apps and Excel calculators, offering convenience and accuracy for on-site and remote work.

Professionals can utilize this tool to adhere to proper specifications, improve weld quality, and avoid defects caused by excessive or insufficient heat. From boiler heat input calculations to travel speed adjustments, it caters to a wide range of industries and applications.

Final Words:

Ultimately, the Heat Input Calculator is an indispensable resource for ensuring precision in heat management. It enhances operational quality, safety, and efficiency, making it a vital asset in thermal and welding processes.