*2.1.1 Welding arc voltage*

Welding arc voltage or arc voltage is the electrical potential difference between the welding wire tip and the molten weld zone surface. The welding arc voltage depends on arc length and type of electrode. Weld bead shape appearance depends on arc voltage. Increasing arc voltage causes porosity, welding reinforcement electrode, spatter flatten the weld bead, and increases the weld width [10].
