Forney 48520 Tig Filler Metal, ER309L Stainless Steel, 1/16-Inch-by-36-Inch, 1-Pound ER309L stainless steel TIG filler metal contains less than 03-Percent carbon for added corrosion resistance Works well for dissimilar joints that will undergo heat treatment Recommended polarity is 90-130 DCEP (+) Tensile strength is 85,000 PSI