ER347 is a stainless steel welding wire used in joining types 321 and 347 grades of stainless. The addition of columbium to this alloy reduces the possibility of chromium carbide precipitation and consequent intergranular corrosion. AWS Specification AWS A5.9/A5.9M:2006 AWS Classification ER347 Welding Current DCEP Typical Wire Chemistry C 0.08 Cr 19.0 - 21.5 Ni 9.0 - 11.0 Mo 0.75 Mn 1.0 - 2.5 Si 0.30 - 0.65 P 0.03 S 0.03 Cu 0.75 Nb 10xCmin/1.0max Typical Mechanical Properties (As Welded) Yield Strength, ksi 57 Tensile Strength, ksi 86 Elongation%, min 35 Welding Positions F,V,OH,H Available Diameters MIG with Operating Range in Amps .023" 35 - 70 .030" 50 - 100 .035" 160 - 210 .045" 180 - 250 Available Diameters TIG with Operating Range in Amps .035" 60 - 90 .045" 80 - 110 1/16" 90 - 130 3/32" 120 - 175 1/8" 150 - 220 5/32" 170 - 350