1. What is a Welding Heat Input Calculator?

Definition: This calculator determines the heat input during welding based on voltage, current, and travel speed.

Purpose: It helps welders and engineers control the thermal effects on materials during welding processes.

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 product of voltage and current represents the power, which is multiplied by 60 to convert to kJ/min, then divided by travel speed to get energy per unit length.

3. Importance of Heat Input Calculation

Details: Proper heat input control ensures weld quality, prevents defects, and maintains material properties in the heat-affected zone.

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: Heat input affects weld penetration, microstructure, mechanical properties, and potential for defects like cracking.

Q2: What's a typical heat input range?
A: It varies by material and process, but common ranges are 0.5-2.5 kJ/mm for most steels.

Q3: Why multiply by 60 in the formula?
A: The factor converts from joules/second (watts) to kilojoules/minute (1 W = 0.06 kJ/min).

Q4: How do I measure travel speed?
A: Time how long it takes to weld a known length, then calculate speed = length/time.

Q5: Does this work for all welding processes?
A: The formula applies to arc welding processes (SMAW, GMAW, GTAW, etc.) but may need adjustment for others.