The last time, we looked at the E6011. This time we'll look at it's big brother the E6010. Granted, the 6010 is a difficult rod to use, and not for the average user to take on in the beginning. It has a cellulosic flux, and very hard driving arc that offers exceptional penetration. Like the 6011, it too has a 60,000 lb tensile strength rating. But for Pipeline, Construction, and large fab shop it is the primary rod used for stick welding in root pass situations.