SAW - Single Wire
Single wire welding is the most widely used SAW method. The solid or cored wires are typically 2.0 - 4.0 mm in diameter, although for some thin plate, high-speed applications, 1.2 - 1.6 mm can be used. DC+ current is generally used with a 20-40 mm stick-out.
A smaller diameter produces a higher deposition rate at the same current, because of a higher current density. The current range for a larger diameter involves higher currents and therefore also higher deposition rates.
A smaller diameter wire produces a more deeply penetrating and narrower weld bead.