PLANNING AND EXPERIMENTAL STUDIES OF THE ELECTROSLAG SURFACING mode on THE DEPTH OF PENETRATION OF THE welded TEETH

The article focuses on the results of a study of the effect of electroslag surfacing modes on the penetration depth of restored teeth, conducted on the basis of a full factorial experiment (FFE) type 22. The welding current and the voltage on the slag bath were selected as factors. Each experiment was repeated three times, and the results were analyzed to build a regression model that takes into account all interactions of factors. The article describes in detail the process of encoding variable factors, constructing a planning matrix, calculating the coefficients of the regression equation and checking them for significance using the Student’s criterion. The adequacy of the experiment was confirmed by calculations using the Fisher criterion (Fcalculated<Ftable). According to the results of the experiment, it was found that the stress on the slag bath has the most significant effect on the total depth of penetration. The optimal mode has been determined (welding current 400 A and voltage on the slag bath 45 V), which provides the required penetration depth (4.63 mm) of a large-modulus tooth. The convergence of the results of the full-scale test with the results of planning a full factor experiment of type 22 was revealed, which made it possible to determine the optimal surfacing mode. This study can be used to optimize the parameters of electroslag surfacing, which will lead to an increase in the quality and efficiency of restoration of worn teeth. Keywords: electroslag surfacing, surfacing mode, penetration depth, welding current, welded tooth.