RG60 Filler Metal, 1/16, Mild & Low Alloy Steel, 1 lb Display Pack These alloys do not carry enough de-oxidizers typically needed with the GTAW process; therefore, it is not recommended.. While RG45 & RG60 seem like similar alloys, they were originally developed for oxyfuel welding, however they can be used for TIG welding in some applications. This product is used for welding most low carbon and low alloy sheet steels.