Flux core wire. Settings .030 vs .035

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Question on flux core. I have a Miller Passport 180.Looking at .030 and .035, Lincoln NR211 and Hobart 21B Fabshield.LincolnHobartSome questions on these wires. When welding with it, why the variance in volts/amps? Is the purpose to match the wire feed and volts to the type of material you are welding? IE 1/4" requires (per Miller's calcuator) around 15-16 volts @ 170-190 amps. Do you set the parameters to the welding table on the welder or go to the 15-16 volt line for the specific wire? Is that basically saying that .035 wire will not weld 1/4" steel, seeing as though it has a max of 160 amps?What is meant by efficiency? Attached ImagesMiller Passport
Reply:Generally, voltage and wire speed are set to match the weld material. The specific wire's suggested operating procedures would be prefered over the setting guide on the welder, or millers calculator.Briggs weldnpower 225/210/cvLn-25 suitcaseMillermatic 130