ESAB (ESAB) had its Relative Strength (RS) Rating upgraded from 78 to 84 Friday. Hone Your Stock-Picking Skills By Focusing On These Factors IBD's unique rating tracks market leadership with a 1 (worst) to 99 (best) score. The grade shows how a stock's price performance over the trailing 52 weeks compares to all the other stocks in our database. History…