Arc Power Density
Arc power density indicates how much electrical power per unit area is converted in the arc. It influences penetration geometry and welding speed.
Physico-chemical mechanism of action
The arc power density is a measure of the electrical power converted per unit area in the arc. This power is released by the anode and cathode of the arc and determines the intensity of the radiation.
Metallurgical relevance & risks in welding
Too high arc power density can cause excessive burn-off and high heat input, leading to uneven weld spacing and possible cracks. Too low power density slows down the welding speed and can lead to insufficient penetration of the steel.
Workshop practice & instructions
The arc power density should be set so that it meets the desired welding process. For thin steels and fine penetration geometries, a low power density (approx. 10-20 J/cm²) is suitable. For thick steels and wide penetrations, a higher power density (approx. 30-50 J/cm²) is required. The exact setting depends on the material type, weld thickness, and specific requirements.