... to AWS-A5.17 F6A2-EL121.a kind of Mid content of Mn, high content of Si and low content of F fused flux.2.Current:either alternating ... .Weld A2, A3, 20G, 16Mn, A32, low-carbon steels, low-alloy steels, and high-strength steels in company with H08A, H08MnA, or ... .It must be baked for 2 hours under the temperature of 250~300°c before welding.2.The rust, oil contamination ...