I bought some 5/32 super abrasive electrodes to add some hardener to one of our cast iron plow shoes to try it out before we do the whole fleet. These rods have roughly 1/4 inch of flux on them, I may be exaggerating a little but it is very thick. I never used these rods before and on the box it says to set the amps at 140 - 160 which sounds right. My question is, with that much flux, how can you tell how much of a bead you are laying or is best to run a practice bead ?