Hi i have a trouble. i am working with SAW process and we rework all the pieces on the edge of a longitudinal seam weld.we weld water heaters in a continuous process.i want probe with AC but i don't know What i need to change filler metal, flux, voltage?actually the parameters are:travel speed 100 in*mincurrent 34-35ampvoltage 21-28 voltsfeed speed 94 in * min