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The article presents the results of tests concerning the effect of the direction of the rolling of plates made in steel 0H18N9 on welding distortions. The research-related analysis was concerned with the rolling direction in relation to the longer edge of specimens. The specimens were welded using the MAG method involving the use of pulsed arc. The acquisition of surface flatness-related data was...
The article presents results of tests performed to determine the noise level in ultrasonic Phased Array testing. The tests, involving non-alloy steel S355 and austenitic steel X5CrNi18-10, were carried out applying a frequently used test configuration and 16-element 5 MHz array probes having an aperture of 10 mm ×10 mm. The obtainment of a differentiated structure, i.e. characterised by various grain...
The article presents selected tapering functions useful when creating hybrid models and functions approximating static current-voltage characteristics of arc. The research work involved the formation and verification of families of static current-voltage characteristics with defined values of voltage ignition and the extension of approximating possibilities of the formulas through the use of tapering...
The article discusses technological tests involving the use of the hybrid process (laser + electric arc (MAG)) for the efficient application of layers (surfacing). The objective of the tests was to determine the effect of an additional welding power source (laser beam) on the possibility of increasing a surfacing rate (in comparison with surfacing rates obtainable using the MAG method) as well as...
The analysis involved a similar welded joint made of steel TP347HFG after operation at a temperature of 580°C. Tests revealed that the primary mechanisms responsible for the degradation of the microstructure in all areas of the joint subjected to analysis were precipitation processes within the grains and along the grain boundaries. The grain boundaries contained two morphologies forming a continuous...
The article discusses the primary issues of the hardfacing of copper elements exposed to intense abrasive wear, gas-abrasive wear at high temperature and in contact with liquid metal. In addition, the article presents test results concerning the surfacing of copper grade M1 performed using a self-shielded fluxcored wire providing weld deposit Fe14 and plasma powder surfacing performed using powder...
The test material was a specimen sampled from sections of a pipe operated for 41,914 hours at a temperature of 575°C and under a steam pressure of 28.2 MPa. The specimen subjected to metallurgical tests was a welded joint made of austenitic steel TP347HFG. The non-destructive tests and the macroscopic tests confirmed the lack of any welding imperfections. The test joint represented quality level B...
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