1. What is a Welding Heat Input Calculator?

Definition: This calculator determines the heat input during welding processes, which is crucial for controlling weld quality and properties.

Purpose: It helps welders and engineers ensure proper heat input for specific materials and welding procedures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HI \) — Heat input (kJ/mm)
• \( V \) — Voltage (V)
• \( I \) — Current (A)
• \( S \) — Travel speed (mm/min)

Explanation: The formula calculates the energy delivered per unit length of weld, accounting for electrical parameters and welding speed.

3. Importance of Heat Input Calculation

Details: Proper heat input ensures weld integrity, prevents defects, and maintains mechanical properties of the welded joint.

4. Using the Calculator

Tips: Enter the welding voltage in volts, current in amperes, and travel speed in mm/min. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is heat input important in welding?
A: It affects weld penetration, microstructure, mechanical properties, and potential for defects like cracking.

Q2: What's a typical heat input range?
A: Varies by material and process, typically 0.5-2.5 kJ/mm for most steel welding applications.

Q3: Why multiply by 60 in the formula?
A: The factor converts seconds to minutes since current×voltage gives joules/second (watts) and speed is in mm/minute.

Q4: How does travel speed affect heat input?
A: Faster speeds reduce heat input, slower speeds increase it - inversely proportional relationship.

Q5: When would I need to calculate heat input?
A: For procedure qualification, troubleshooting weld issues, or when working with heat-sensitive materials.