1.Smelting flux 2.Light yellow to light green 3.Grain size: ... -A21.Low-Mn, mid-Si and mid-F fused flux.2.Current:direct current(DC).usage:1.for welding steam ... , nuclear power plant and refractory steels(for example, oil refining equipment).2.Performance of all-weld metal:high stability, high ... , such as oil stain, moisture, iron rust, etc.2.Flux must be baked for 2 hours under the temperature of ...