Technical Specification Sheet. Dynashield Flux Cored Welding Wire E71T-1. Description. Dynashield 71T-1 is a gas-shielded carbon steel wire for fabrication of mild and low carbon steel; structural and pressure vessel grades. ... 100% C02. 75%Ar/25% C02. Carbon. 0.04. ... 100% C02. ... Yield Strength psi (MPa) ... @-20 F (-29 C)