| Abstract [eng] |
Plasma arc cutting is one of the most common way to prepare blanks in our days. This sheets cutting method is relatively fast, cheap and ensures quite good quality of cut. However, this type of cutting has negative impact on material such as material hardening and heat affected zone near the cut edge, what leads to changes of microstructure or micro cracks. This master’s project reveals what impact on blank quality can be made by changing parameters of plasma arc cutting. Several blanks of steel S235JR, S235JR+N and steel AISI 316 L were prepared by changing cutting parameters. To analyse relation between cutting parameters and cut quality, the measurements of hardness near the cut and surface roughness were done by using each blank. Also, there were the measurement investigations of heat affected zone done. The investigations and measurements reveals that by changing cutting parameters it is possible to achieve variations of heat affected zone, as well as variations of cut surface roughness. Also the investigations show that material near the cut edge becomes much harder than base material and this hardness reduces when the distance from the cut edge increases. |
