K4601 Metal-Cored Welding Wire Material Carbon Steel Wire Type Metal-Cored Process Metal-Cored Welding (MCAW) Wire Diameter 0.045 in Tensile Strength (As Welded) 75 to 85 ksi (75 Percent Argon/25 Percent Carbon Dioxide) 80 to 90 ksi (90 Percent Argon/10 Percent Carbon Dioxide) Yield Strength (Minimum Required) 58 ksi Yield Strength (As Welded) 65 to 75 ksi (75 Percent Argon/25 Percent Carbon Dioxide) 65 to 80 ksi (90 Percent Argon/10 Percent Carbon Dioxide) Spool Type Steel Spool