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The article presents the results concerning hot crack susceptibility of selected steels having an austenitic structure. The tests were based on the analysis of the chemical composition of these steels and utilising special stations for the Transvarestraint tests and the Blanchet method. During the tests it was possible to observe cracks in the liquid-solid area. The results obtained indicate the existence...
The article presents the analysis of guidelines contained in PN-EN ISO 17640 related to ultrasonic tests of welded joints with reference to aligning the angle of beam introduction into a weld fusion line as well as the results of tests investigating the bevelling angle effect on the amplitude of echo bounced off the bevelled surface simulating the echo bounced off incomplete side fusions. The tests...
The article presents results of the FEM simulation involving friction stir welding (FSW) of check valve ball elements. The tests involved the obtainment of temperature fields, information about stresses and displacements during the process and about residual stresses and strains following the cooling of elements welded. The knowledge obtained concerning process thermal conditions and that concerning...
Graded materials are increasingly commonly used as structural materials in many advanced engineering structures. These materials are usually characterised by the gradual change of a specific functional parameter, usually in the direction of thickness. The article presents the general characteristics of graded metals and their manufacturing methods. On the basis of selected results of author’s own...
The research involved the determination of physical factors affecting the generation of arc column length disturbances in electrotechnological devices. The article contains a justification related to the selection of the Pentegov model for representing the dynamic characteristics of a sinusoidal current powered arc. The research also included the modification of the Ayrton formula approximating static...
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