Welding Heat Input Calculator

Welding Process

Select process & efficiency

🪚 SMAWStick (η=0.75)

⚡ GMAWMIG (η=0.85)

✨ GTAWTIG (η=0.70)

🔄 SAWSubmerged (η=0.95)

Welding Parameters

Enter arc data

Arc Voltage (V) volts

Welding Current (I) amperes

Travel Speed (v) mm/min

Thermal Efficiency (η)

Plate Thickness (t) mm

Ambient Temp. °C

Material Group

Joint Type

Welding Heat Input Analysis Result

SMAW (Stick) · 0.75 efficiency

LIVE

Arc Power
0
kW

Heat Input (H_i)

kJ/mm

Cooling Rate (t_8/5)

sec

Preheat Temp

°C

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Heat Input (Hi): Hi = (V × I × η) / (v × 1000) [kJ/mm] where v = travel speed in mm/s
Cooling Rate (t8/5): Estimated using Rosenthal's equation for plate thickness
Preheat Temperature: Based on carbon equivalent (CE) and thickness (BS EN 1011-2)

Controlling heat input is critical for weld quality, HAZ properties, and preventing defects like hydrogen cracking. This calculator helps welding engineers and inspectors determine arc energy, net heat input, cooling rate (t8/5), and required preheat temperature based on welding parameters.

Applications: Procedure qualification (WPS/WPQR), hydrogen crack prevention, HAZ hardness control, and distortion prediction.

— Vaibhav Dhokpande, Developer · TaskJunction