Oerlikon Fluxofil 31 description: FLUXOFIL 31 is a seamless copper coated basic flux cored wire. The operating features produce very crack resistant and tough welded joints with very low hydrogen content, especially when welding steels with a higher carbon content. Pore-free welds with easy slag removal. Weld metal with very low content of diffusible hydrogen (HD< 3 ml/100g deposited weld metal). A low-slag variant FLUXOFIL 31 S is available to order.