A non-copper-coated solid wire designed for welding carbon and carbon-manganese steels with tensile strength up to 510 MPa. Suitable for single or multi-pass welding. Applications include tanks, boilers, steel structural works, earthworks and construction works. Manufactured from first choice wire rod with very low content of phosphorus and Sulphur impurities, it is produced with an innovative system which considerably improves wire feeding in the torch liners, thus reducing the need for torch spares. No vibrations at all, very limited spattering, smooth and good-looking weld beads. Suitable for semiautomatic, automatic and robot welding, especially in those applications in which welding parameters are high. To be used under the shield of Ar./ CO2 or CO2.