Influence of plasma transferred arc welding parameters on the obtained microstructure of 316l coating

The paper describes the surfacing technology for coating of high-alloyed austenitic stainless steel 316L on the steel S235JR base material. Coatings were applied by plasma transferred arc welding process. The 5 samples were made using different welding currents while other welding param-eters were constant. Metallographic analysis of the obtained samples is used to establish a correlation between the micro-structural constituents and the applied welding current in the surfacing process. According to this it was possible to determine the optimal parameters of coating surfacing. The filler material was in the form of powder, while its charac-terization was performed by scanning electron microscopy, and the characterization of the obtained coatings by optical microscopy.