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1.
Application of semantic technology for calculation of welding time in the development of new products
Ambrož Stropnik, Tomaž Vuherer, Ivan Samardžić, Milan Zorman, 2017, original scientific article

Abstract: Determining the time of execution is very important in the early stages of each project (e.g. making offers, design phase etc.), especially in the stage of planning. This paper presents our approach to estimating the welding time for the purposes of planning the manufacturing processes. The approach is based on the knowledge of welding experts from the Nieros metal d.o.o. company and standards of welding (international and internal). An expert system was developed based on semantic web technologies for calculating the welding time in the product design phase and it is strongly integrated with the main ERP system of the Nieros metal d.o.o. company. Test results are presented at the end of this article.
Keywords: expert systems, new product development, ontology, welding of steels
Published: 23.08.2017; Views: 523; Downloads: 320
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2.
Weldability prediction of high strength steel S960QL after weld thermal cycle simulation
Marko Dunđer, Tomaž Vuherer, Ivan Samardžić, 2014, original scientific article

Abstract: This paper presents weld thermal cycle simulation of high strength steel S960QL, and describes influence of cooling time t8/5 on hardness and impact toughness of weld thermal cycle simulated specimens. Furthermore, it presents analysis of characteristic fractions done by electron scanning microscope which can contribute to determination of welding parameters for S960QL steel.
Keywords: high strength steels, S960QL steel, weldability, weld thermal cycle simulation, hardness, toughness
Published: 03.07.2017; Views: 2077; Downloads: 102
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3.
Weldability of microalloyed high strength steels TStE 420 and S960QL
Marko Dunđer, Tomaž Vuherer, Ivan Samardžić, 2014, original scientific article

Abstract: The paper presents research of weldability of microalloyed high strength steels TStE 420 and S960QL after weld thermal cycle simulation. Beside mechanical properties hardness and impact strength, the microstructures of characteristic weld thermal cycled structures for both steels are given. The results will contribure to determination of weakest points in Heat Affected Zone of both steels.
Keywords: weldabilty, high strength steels, mechanical properties, TStE 420, S960QL
Published: 03.07.2017; Views: 1560; Downloads: 91
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4.
Weldability investigation steel P 91 by weld thermal cycle simulation
Marko Dunđer, Ivan Samardžić, Tomaž Vuherer, 2015, original scientific article

Abstract: This paper elaborates results of hardness and impact energy of thermal cycle simulated specimens of high-alloy steel P 91 and their dependence on cooling time from 800 to 500 °C. Results were obtained by measuring hardness HV 1 and by experimental testing of Charpy notched specimens. Metallographic analysis of samples was performed on scanning electronic microscope.
Keywords: welding, P 91, hardness, impact energy, cooling
Published: 03.07.2017; Views: 1595; Downloads: 75
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5.
Suitability of heat treatment for crack resistance of material in the connection part of heavy transporter for liquid slag
Tomaž Vuherer, Ljubica Milović, Milorad Zrilić, Ivan Samardžić, Vladimir Gliha, 2013, short scientific article

Abstract: The post weld heat treatment (PWHT) was used to reduce the level of the residual stresses and increase of the crack resistance of the materal in the cnnection part. The article presents the results of the residual stress measurements immediately after welding and after the stress relaxation by the PWHT.
Keywords: weld, heat treatment, residual stress, stress relaxation, crack resistance
Published: 03.07.2017; Views: 1609; Downloads: 61
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6.
Influence of vibrations on residual stresses distribution in welded joints
Ivan Samardžić, Tomaž Vuherer, Dejan Marić, Pejo Konjatić, 2015, original scientific article

Abstract: This paper presents research experience related to implementation of vibrations on residual stress relief with the equipment for treatment by vibration method. The paper provides explanation of effects achieved by vibration method when implemented during welding, and elaborates advantages and disadvantages of that method applied after welding process. In order to present effects of vibration on solid structures, there was experimental analysis performed and compared with heat treatment.
Keywords: welding, vibrations, residual stress, heat treatment
Published: 03.07.2017; Views: 472; Downloads: 82
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7.
Impact energy analysis of quenched and tempered fine grain structural steel specimens after weld thermal cycle simulation
Marko Dunđer, Tomaž Vuherer, Ivan Samardžić, 2014, original scientific article

Abstract: The paper presents impact energy results of thermal cycle simulated specimens of quenched and tempered fine grain structural steel S960QL. These results are obtained by examining notched Charpy specimens. Upon performed metallographic analysis and measured hardness, total impact energy is separated into ductile and brittle components.
Keywords: quenched and tempered fine grain structural steel, welding thermal cycle, impact energy, cooling time t8/5
Published: 03.07.2017; Views: 595; Downloads: 76
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8.
Fatigue crack growth and fracture mechanics analysis of a working roll surface layer material
Matej Drobne, Tomaž Vuherer, Ivan Samardžić, Srečko Glodež, 2014, original scientific article

Abstract: Fatigue crack growth and fracture mechanics analysis of a working roll surface layer material is presented in this paper. The research is done on a hot strip mill working roll where High Chromium Steel is used for roll’s shell material. To obtain corresponding parameters, a rectangular single edge notched bend specimens – SENB, according to standard BS 7448, were used. The fatigue crack growth analysis was done on a resonant testing machine with use of special crack gauges, while for fracture mechanics parameters the electro–mechanical testing machine was used.
Keywords: fracture mechanics, fatigue crack growth, metal forming, rolling process, high chromium steel
Published: 03.07.2017; Views: 497; Downloads: 81
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9.
Dependence of hardness and impact energy on cooling time Δt8/5 and temperature for S960QL
Ivan Samardžić, Marko Dunđer, Tomaž Vuherer, 2014, original scientific article

Abstract: The paper deals with research into dependence of hardness and impact energy of thermal cycle simulated specimens of fine-grained structural steel S960QL on cooling time from 800 to 500 °C and on tested temperature. Results were obtained by measuring hardness of HV 10 and by experimental testing of Charpy notched tubes on instrumented Charpy hammer. Total impact energy, initiation energy and fracture propagation energy needed for occurrence of fracture is also elaborated.
Keywords: structural steel, quenched hardness, impact energy, cooling time
Published: 03.07.2017; Views: 514; Downloads: 74
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10.
Microstructural investigation of the heat-affected zone of simulated welded joint of P91 steel
Tomaž Vuherer, Marko Dunđer, Ljubica Milović, Milorad Zrilić, Ivan Samardžić, 2013, original scientific article

Abstract: In the process of testing real components exposed to elevated temperature, it is not possible to neglect cracks. The most significant cracks can be induced by welding, which is applied for joining of structural components. Pressure equipment in service is also exposed to high pressure and high stresses. Materials for their manufacturing are designed to resist high stressat elevated temperature, and to meet requirements regarding creep resistance. The objective of this study is to investigate microstructure of different regions of the heat affected zone in T/P91 steels by using thermal simulation instead of welding.
Keywords: welded joints, microstructures, P91 steel, heat-affected zone, heat treatment
Published: 10.07.2015; Views: 593; Downloads: 128
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