Interesting question: low hydrogen SMAW electrodes for root passes??
So, do they make low hydrogen SMAW electrodes differently for root passes compared to fill and/or cover passes?
Let's break this down:
1) Yes Bohler makes Low Hydrogen SMAW electrodes.
2) SMAW low hydrogen electrodes can be used successfully to weld root passes. Pretty easily actually.
3) Therefore, Bohler makes Low Hydrogen SMAW electrodes for root passes.
But, is there a particular reason for the question? Application, code, material, that is presenting you with a problem?
Or, are you a salesman promoting Bohler electrodes?
Personally, I find Bohler electrodes slightly less than satisfactory. Others will disagree. Others will strongly agree.
But, for myself, I'll take Lincoln Excalibur any day of the week. For root passes, fill passes, and cover passes. Flat, vertical, overhead, and Horizontal. We buy Bohler only in an emergency when Lincoln is not available and can't get it ordered quick enough. That's why I keep plenty on hand. Don't depend on the local welding suppliers to get exactly what I need exactly when I need it.
He Is In Control, Have a Great Day, Brent