"...Would someone please explain how wire feed speed affects amperage?"
The voltage setting on your machine actually provides a range of settings (CV) and the wire feed speed will allow you to set amperage partially by moving up or down within that range. However, there are two other factors that will also affect amperage which are part of your manipulation. These are your contact to work distance and your travel speed. All four settings combined will produce your actual amperage at the weldment.
If you want to see illustrations of each of these factors while the other three are held constant, I will look for a set of articles that I know of that does this. If this answers your question....
Use the Miller Weld Caculator for settings you aren't sure of, until you get used to setting on your own.
EDiT - Ithink these are the articles I mentioned above:
https://ewi.org/gas-metal-arc-weldin...lding-voltage/
https://ewi.org/gas-metal-arc-weldin...distance-ctwd/
The voltage setting on your machine actually provides a range of settings (CV) and the wire feed speed will allow you to set amperage partially by moving up or down within that range. However, there are two other factors that will also affect amperage which are part of your manipulation. These are your contact to work distance and your travel speed. All four settings combined will produce your actual amperage at the weldment.
If you want to see illustrations of each of these factors while the other three are held constant, I will look for a set of articles that I know of that does this. If this answers your question....
Use the Miller Weld Caculator for settings you aren't sure of, until you get used to setting on your own.
EDiT - Ithink these are the articles I mentioned above:
https://ewi.org/gas-metal-arc-weldin...lding-voltage/
https://ewi.org/gas-metal-arc-weldin...distance-ctwd/
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