Welding Heat Input Calculator

When to use this manufacturing calculator

• Use when reviewing weld procedure variables.
• Use when comparing travel speed or current changes.
• Use before weld-strength, distortion, or drawing review workflows.

How to use

1. Enter the manufacturing dimensions, speeds, feeds, process values, and material assumptions for one preliminary calculation.
2. Click the exact calculator action button; default values, typing, URL-prefilled values, and worked examples do not generate results automatically.
3. Review warnings, assumptions, result visual, copy text, and downloads before using output in a shop, drawing, supplier, or process-planning workflow.
4. Verify every final value against machine documentation, tooling supplier guidance, material data, inspection requirements, and qualified manufacturing review.

Input guide

Voltage and current

Arc electrical values.

Travel speed

Weld travel speed in mm/min or in/min.

Process efficiency

Dimensionless thermal efficiency factor between 0 and 1.

Notation

Output interpretation

• Heat input, arc power, process efficiency, travel speed, warnings, visual summary, and exports.

Supported manufacturing use cases

• weld heat-input checks
• travel-speed comparisons
• process-efficiency scenarios
• metric and inch travel speed

Unsupported patterns

• welding procedure qualification
• code compliance approval
• metallurgical heat affected zone prediction
• distortion simulation

How to interpret the output

• Higher heat input can affect bead size, cooling rate, distortion, and material properties.
• Procedure qualification and inspection standards still control production welding.

Manufacturing planning guidance

• Document units and process efficiency assumptions.
• Check applicable welding standards, material requirements, and WPS/PQR controls.

Worked examples

Assumptions

• Inputs are user-entered planning values and are not extracted from CAD files, CNC code, CAM systems, drawings, or shop databases.
• Metric calculations use millimetres, metres per minute, millimetres per minute, and SI-derived output where stated.
• Inch calculations use inches, surface feet per minute, inches per minute, and inch-derived output where stated.
• Voltage, current, and travel speed are representative steady values.
• Process efficiency is user-selected and appropriate for the process.

Practical guidance

• Pair with weld-strength and drawing-review tools for broader weld planning.

Common mistakes

• Mixing mm/min and in/min.
• Using efficiency 1.0 without justification.
• Treating heat input as procedure qualification.

Limitations

• No preheat, interpass temperature, joint geometry, metallurgy, code, or inspection model is included.
• ScholarTool manufacturing calculators provide general engineering calculation and planning support. They do not replace supplier requirements, tooling recommendations, machine-tool documentation, process qualification, inspection standards, or professional manufacturing review.
• The tool does not select a tool grade, coating, holder, fixture, coolant strategy, inspection plan, or supplier-approved process.
• The tool does not generate or execute G-code, CAM toolpaths, CNC simulations, machine programs, or production schedules.

Related workflow links