average tensile strength ksi yield strength ksi charpy impact toughness ft lbs at u2212 20 u00b0 c charpy impact toughness ft lbs at u2212 30 u00b0 c and percent elongation of the fourteen non limiting weld metals is set forth as follows the weld beads in the above examples were formed on x 100 pipe sections by an electric arc welding process a one pass per layer welding operation using a robotic welder was used to form the weld bead a travel speed of less than 50 in min and a deposition rate of less than about 14 lbs hr were used to form the weld bead a shielding gas of argon and carbon dioxide was used during the welding process the yield strength ys of the weld metal was found to have a linear dependence on the amount of carbon manganese and nickel in the weld metal amongst these three elements the strongest linear dependence was on the carbon content in the weld metal as the carbon content increased in the weld metal the yield strength of the weld metal increased similarly increased manganese and nickel content in the weld metal increased the yield strength the tensile strength ts of the weld metal was found to have a linear dependence on the amount of carbon and nickel in the weld metal amongst these two elements the strongest linear dependence was on.