Key Stages: Raw Material Input, Leveling, Slitting, Forming, Welding/Joining, Surface Treatment, Quality Control. Several essential components contribute to the efficiency and output of a cable tray production line. At its core, a cable tray production line is a series of manufacturing processes and machinery designed to fabricate cable trays—those metal or fiberglass channels electricians use to support insulated electric cables. It is also pretty helpful for cable managing system.