Langmatz GmbH develops, produces and markets technical system solutions made of plastic and metal for the energy technology, telecommunications and transportation technology sectors. The system for welding manhole covers consists of two stations and a QIROX QRC-350-E welding robot. The double station positioner carries out the station change by means of a horizontal turning movement. Each station is equipped with a horizontal rotary axis and a counter bearing. The long reach of the seven-axis robot further simplifies and accelerates the welding of complex workpieces. The robot is also equipped with a tactile gas nozzle sensor and an arc sensor. This means that the arc is not only used for welding, but also for measuring the workpiece joint position. This saves time, while at the same time workpiece deformations - for example due to thermal expansion - are directly compensated for. The highlight of the system is the combination of stud and arc welding in one robot system. A torch changing system enables flexible switching between the two processes.