Oerlikon Carborod Ni3 description: CARBOROD Ni3 is an ER 80S-Ni3 type solid TIG welding rod depositing a C-1.0Mn3.2Ni weld metal. Suitable for use with mainly Ar shielding gas. CARBOROD Ni3 is used for welding 3.5% nickel steels for low temperatures service, where weld metal toughness properties down to -101C are required.