ANSI AWS A5.1-91 E6013 RUTILE ELECTRODES - THE EFFECT OF WOLLASTONITE/

As there is not enough information about rutile electrodes in the inte rnational welding literature, this study has been carried out as part of a working program aiming to obtain fundamental knowledge about this system. This study consists of the replacement of 0, 8 and 16% of qua rtz (100% SiO2) with wollastonite (calcium silicate, 50% CaO/50% SiO2) in the coating dry mix of three rutile ANSI/AWS A5.1-91 E6013 electro des. It was found that the increase of CaO in the covering produced th e following: An increase in the slag basicity A decrease in silicon an d oxygen all-weld-metal contents A diminution of the diffusible hydrog en in the weld metal A marked increment of all-weld-metal toughness. I n this way, the requirements of the Navy Industry International Regist er Grade 3 could be achieved and the minimal ANSI/AWS A5.1-91 E7018 to ughness requirements were also satisfied. The previously mentioned cha nge in the coating composition also improved the performance of the el ectrode in the vertical welding position, though slightly deteriorated the flat welding position, with the typical excellent operational cha racteristics of rutile electrodes remaining constant.