As a welder, the fast freezing characteristic is what makes the electrode most useful for open root applications. This allows for variations in fitup to be overcome by manipulation. I have previously qualified for open roots with 7018 and 3xx-16 electrodes. Without a remote amperage control or extremely consistent fitup, it's extremely difficult to get a satisfactory root pass.
If I could get ss electrodes that welded like cellulose electrodes id have it made.
Because the best current cellulose bead rods, Lincoln 6010+ and 6P+, are specifically designed for open butt V pipe welds, uphill or down. Many, many decades of refinement have made those rods what they are. And they're the best choice given quality and production hands down, within the pipe grades they are applicable to.
Same with 70+ and 8P+, the best downhill rods available for hot pass/fill/cap.
Fast and economical to the contractor, good operator appeal to the welder, decent price for the owner.
Until better options come along those will be king in cross country mainline construction from the standpoint of the welder, the contractor and the owner.
