Elimination of Cracks in Metal Parts

Abstract

One of the most versatile and effective methods of restoring parts is the method of electric spark processing. On the basis of this method, a technological process was developed that allows to obtain a thick-layer coating of increased continuity. The use of electric spark processing in the restoration of parts is an urgent task of eliminating cracks in metal parts of machines. (Research purpose) The research purpose is eliminating cracks in metal parts of machines by the electric spark processing to obtain sealed coatings. (Materials and methods) BRKMTS3-1 bronze was chosen as the main electrodes, M1 copper was chosen for the reflow electrode for experimental work to eliminate cracks by electric spark treatment. It was determined that the process of eliminating cracks took place in several cycles. (Results and discussion) Experiments have shown that, using only the reception of a thick-layer electric spark coating, it is possible to close a crack up to 1.5 millimeters wide inclusive, but it is practically impossible to obtain a sealed coating. It was established as a result of studies of the effect of surface plastic treatment that the average microhardness of the coating, untreated by the method of surface plastic deformation, was 250 according to Vickers. The maximum microhardness of the sample treated by the method of surface plastic deformation at a depth of 0.05 millimeters was more than 500 Vickers. (Conclusions) The experiments carried out to eliminate cracks have shown that using only the reception of a thick-walled electric spark coating, it is easy to close a crack up to 1.5 millimeters wide inclusive, but it is almost impossible to obtain a sealed coating, since it has significant porosity. For those cases where the tightness of the seam is mandatory, additional processing by the method of surface plastic deformation is necessary.