The Quality Analysis of the Thermal Sprayed Deposited Layers by Electronically Microscopy

The analysis performed by electronically microscopy lead to obtain the experimental data under tabular form. A linear chemical quantitative analysis over a 228.87 µm length was made of on a microscopically image at 250x magnification. The number of points where analyze was made of is 512. Due to the higher number of points which were used for marking of these curves, the interpretation is difficult. Therefore, is necessary an additional assessment processing of these curves which can permit the interpretation of the quantitative chemical analysis. Among the processing versions of the curves, the average for a number of values, choose dependent on the follow purpose, lead to some curves which permit the interpretation of the results

Mechanical Tests of the Dissimilar Welded Samples by Friction

The paper presents the experimental achievement of heterogeneous joints, with dissimilar materials, as well as the analysis of these joints by mechanical and metallographic tests. After traction testing of the specimens, it was found that breaking occurred each time in the area of the base material, which leads to the conclusion that the strength of the welded joints is above the resistance of the base materials used

The Block Diagram for the Synchronous Motors used for the Compensation of the Reactive Power

The optimal control system for the compensation of the reactive power in an energetic consumer assembly is presented, containing one or more synchronous motors, connected to the same power bars in parallel, including asynchronous motors and static converters. The compensation of the reactive power absorbed from the system by the consumers is possible, using a optimal control system that controls the reactive power provided on the bars by the synchronous motors on condition that the power losses in the created whole are zero. A limited functional block diagram of the synchronous motor, which is the controlled object completed with the control circuits of the exciting tension and current is obtained having as set value the sum of all reactive currents of the consumers from the power assembly. The optimization is obtained using the module criterion of Kessler

Air Compressor Driving with Synchronous Motors at Optimal Parameters

In this paper a method of optimal compensation of the reactive load by the synchronous motors, driving the air compressors, used in mining enterprises is presented, taking into account that in this case, the great majority of the equipment (compressors, pumps) are generally working a constant load

Experimental Measurements of Adherence of Thermally Sprayed Layers

The bond strength of the thermally sprayed coatings is one of the most important features in the assessment of deposition quality. Standardized methods for determining the adhesion of thermally sprayed coatings refer to the layers deposited on flat surfaces and on the outer diameter of the cylindrical parts. Thermal spray deposition on internal cylindrical surfaces is particularly difficult for low diameter. In the case of inner cylindrical surfaces, one of the parameters that strongly influence adhesion is the diameter of the parts on which the deposit is made. The proposed method of measuring the adhesion of thermally sprayed layers offers concrete values of shear breaking force. This method can be successfully used especially for experimental samples having a small internal diamete

The Compensation of the Reactive Power with Synchronous Motor

An optimal control system for the compensation of the reactive power in an energetic consumer assembly is presented, containing one or more synchronous motors, connected to the same power bars in parallel, including synchronous motors and static converters. The compensa-tion of the reactive power absorbed from the system by the consumers is possible, using a optimal control system that controls the reactive power provided on the bars by the synchronous motors on condition that the power losses in the created whole are zero. A limited functional block diagram of the synchronous motor, which is the controlled object completed with the control circuits of the exciting tension and current is obtained having as set value the sum of all reactive currents of the consumers from the power assembly. The optimization is obtained using the module criterion of Kessler

Optimal System for the Compensation of the Reactive Power with Synchronous Motors

In the activity of some factories that use synchronous motors it’s nec-essary to chose and maintain the most rational value of the reactive power provided by the synchronous motors. In the context of the reduction of the energy consumption and knowing that the power of the synchronous motors is relatively great in the air compressor stations, the approach of the optimal regime of functioning of the synchronous motors, concerning the energy consumption, is necessary. Considering the synchronous motors together with the other consumers fed from the same bars and the feeder cable a functional utility, in the paper as optimising is presented the working regime that assures, on the defined above assembly, the minimal losses of energy

Experimental Testing of Welding Saw Blade of Ribbon

This paper presents the results of experimental electric welding with pressure butt of ribbon saw blades. The analyzes and tests carried out resulting conclusion is that this process is the best solution for the refurbishment of these blades, provided to make a comeback heat treatment after welding