In the present work, a test method for determining the life cycle of coated rotating bending specimens under alternating bending stress is elaborated and the wear behaviour of driving rollers in the hot rolling mill is analysed for the future elaboration of wear tests.

An existing test rig is adapted in order to reproduce the stress on a roll-side sleeve derived from operation in a rotating bending test. Through the targeted use of numerical and experimental methods, a specimen geometry is worked out, with which the pure substrate material achieves the required life cycle in the rotating bending test under the high bending stress close to operation. The heat processes during the laser deposition welding process of the samples are mapped in a numerical model and used to optimize the coating process. The simulation results are supported by continuous temperature measurements. The first test, of a conventionally laser cladded coating of Stellite 21, shows a significant effect on the lifetime of the rotating bending specimen, providing initial insights and revealing phenomena that can be expected in the future.

In the second part of this thesis, the tribological behaviour of driving rollers in the hot rolling mill is analysed. The insights of a functional analysis and the evaluation of measurement data are used to define operating conditions with different tribological properties. To identify the wear mechanisms, an upper driving roller is inspected during a plant shutdown. The forms of wear that can be detected are recorded by replica and then examined in the laboratory. From this, initial deductions can be made about the prevailing wear mechanisms. For each operating condition, the tribological behaviour is recorded schematically and clearly in tribological systems. On this basis, a proposal for the experimental design of future application-related wear tests of laser-welded coatings is elaborated.