Because the rms voltage is typically a better measure of the true heat input to the weld by the welding process, {TAIL ~ the rms weight b} is preferably greater than the average weight a, that is, b>a. Moreover, the sum of the weighting factors is preferably {HEAD ~ unity}, that is, a+b=1 
Because the rms voltage is typically a better measure of the true heat input to the weld by the welding process , { TAIL ~ the rms weight b } is preferably greater than the average weight a , that is , b > a. Moreover , the sum of the weighting factors is preferably { HEAD ~ unity } , that is , a+b=1
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