RB-26 is the traditional and advanced covered electrode for all-position welding (including vertical downward position) of mild steel sheets.

RB-26 is a high titania type covered electrode for welding mild steel.

It was developed in 1951.

The R in RB stands for rutile, which is the major ingredient in the coating flux, while B symbolizes a slag-shield covered electrode.

26 represents the 26th year of the Showa era of Japan, corresponding to 1951 when it was developed.