Bohler FOX CEL+ description: Cellulose electrode for vertical-down welding of large diameter pipelines. Especially recommended for root pass welding on D.C. positive polarity in the vertical down and vertical up welding positions. Apart from its good welding and gap bridging characteristics Bohler FOX CEL+ provides a powerful arc that deposites well penetrated, smooth root passes with high travel speeds as well as high safety against the formation of piping or hollow bead and undercut.