Esab Dual Shield B6 description: Dual Shield B6 is an all-position flux cored electrode designed for using with 75% Ar / 25% CO2 or 100% CO2 shielding gas. Dual Shield B6 is intended for use on pipe and plate steels having a nominal 5% chromium - 0.5% molybdenum composition. These steels are typically used in process piping in the oil, gas, petrochemical, and marine industries.