Staha Systemhallen GmbH, one of the biggest hall manufacturers of Northern Germany, relies on a modern production with a high degree of automation. A CLOOS robot system is used for automated welding of the complex steel components. Two QIROX QRC-410 welding robots are the heart of the system. The robots are mounted overhead to a C-frame and can be moved on the floor-mounted linear track with a travelling length of 18 m from one side to the other. The system can be flexibly used for steel beams of different lengths and sizes. The robot system is programmed offline with the RoboPlan software by CLOOS. Thus STAHA increases the efficiency and the quality of the hall production many times over.