The aim of the research is to analyse the impact of geometrical parameters of gauge and displacement upon rail head side wearing on curves and present proposals to increase durability of rails on curves.

The aim of the research is to analyse the impact of geometrical parameters of gauge and displacement upon rail head side wearing on curves and present proposals to increase durability of rails on curves.

The principal of works means and reception of the solution, used for the investigation of rails flaw do not change. Even the newest microprocessor systems of rails’ flaw detection which is found in the latest year uses the simplest criteria’s, that are the amplitude of the reflected ultrasound signal and delaying time. While computer and microprocessor technology improves, the means of numerical measurement and possibilities of processing data, that is signals capable to measure the large majority of the more difficult structure and the algorithm or functions, are found out. The widest classification of the objects is used for identifications’ solution based on separating random processes. The acoustic diagnostic of engines and mechanics, sound and ultrasound defectoscopy, and objects’ identification in accordance with spread signals’ of noise that are in the random background and etc. are named in all those areas where the method of random processes’ classification is suitable.

Šiame baigiamajame magistro darbe tiriama R65 tipo bėgio kontaktinio suvirinimo jungtis. Supažindinama su pagrindiniais mokslininkų parašytais straipsniais, bėgių kontaktinio suvirinimo tematika. Pateikiama tyrimų metodika, kurią sudaro šios dalys: apžiūrimasis paviršiaus tyrimas, ultragarsinės kontrolės tyrimas, važiuojamasis paviršiaus kiečio bandymas, sulydimo zonos nustatymas, termiškai suminkštintos zonos kiečio matavimas, mikrokietumo matavimas, mikroskopinis jungties matomosios terminio poveikio ir sulydymo zonų tyrimas, smūginio tąsumo bandymas, cheminė analizė, aširačio bandažo ir bėgio sąveikos tyrimas baigtinių elementų metodu (BEM). Išanalizuoti gauti tyrimo rezultatai, kurie įvertina suvirinimo siūlės kokybę. Pateiktos tiriamojo darbo išvados. / In the final thesis of masters degree I analyze the R65 type rail joint that were welded flash butt. Introducing with scientific articles about flash butt welding of rails. Survey methodology of the research, which consists of the following parts: visual surface review of welded joint, ultrasonic rail inspection, hardness test of upper part of the rail, fusion area research, the measurement test hardness of heat-softened area, the measurement test microhardness, microstructure research of the welded joint, impact strenght experiments, chemical analysis of welded joint, wheel-rail interaction research of the finite element method (FEM). Analyzes the results of the research, who assess the quality of weld. The conclusion is based on the results of this research.