Other than knowing the correct mig feed speed for the thickness of any given material so that said welding doesn't collapse, or the percentages of oxygen to acetylene to avoid a minor, but life altering explosion, I would agree maths has naff all involvement in welding.
well your not a welder clearly
i would put money i could give you and some one who knows basic maths (gcse grade E) a WPS a Tig and get you to weld a basic 1G weld both results would be similar