The goal of this research is to choose the proper method of car body welding. Properties of weld metal deposits depend on many conditions. First of all, this paper attempts to study the role of oxide inclusion sites on the transformation of austenite to acicular ferrite in steel weld metal deposits and their toughness. Safety and exploitation conditions of welded steel structure depend on many factors. The most significant of those factors are connected with materials, welding technology, state of stress and temperature. Because of that a good selection of steel and welding method is crucial to obtain proper steel structure. Car body elements of higher durability are made of low carbon and low alloy steel, very often with small amount of carbon and the amount of alloy elements such as Ni, Mn, Mo, Cr and V in low alloy steel and their welds. In the terms of the kind of steel it is used a proper welding method and adequate filler materials. In the present paper the influence of Mn, Ni, Mo, in WMD on the behaviour of steel structure for low temperature service was tested.
Summary. The goal of this paper is to analyze the exploitation and safety conditions of weld steel structure of car body truck frames after welding repairs made by covered electrodes. The main role of conditions in connected with materials, alloy elements in steel and filer materials, welding technology, state of stress and temperature. Because of that, good selection of steel and choice of welding method for proper steel structure repairs are very important. For responsible steel, structures like truck frames and low alloy steel are used, very often with small amounts of carbon and some amounts of alloy elements such as Ni and Mo in low alloy steel and their welds. To study the frame's flexibility and resistance, welded joints have been analyzed. Samples have been welded by steel electrodes with various amounts of Ni.
ELEKTRODY OTULONE DO NAPRAW RAM POJAZDÓW CIĘŻAROWYCHStreszczenie. Celem artykułu jest analiza właściwości eksploatacyjnych oraz bezpieczeństwa naprawianych ram pojazdów ciężarowych z użyciem spawania. Ważną rolę odgrywają połączenia materiałów, pierwiastki stopowe, materiały dodatkowe, technologia spawania, stan naprężeń oraz temperatura. Bardzo istotne są odpowiedni dobór stali oraz metody spawalniczej. Na odpowiedzialne konstrukcje stalowe, jak np. ramy pojazdów ciężarowych, jest używana niskostopowa stal, często z niską zawartością węgla oraz dodatkiem pierwiastków stopowych, takich jak Ni oraz Mo. Do oceny elastyczności oraz wytrzymałości połączeń spawanych w ramach pojazdów ciężarowych, analizowano właściwości połączeń wykonanych elektrodami o różnej zawartości Ni.
22M.
Purpose: The purpose of the tests is to determine whether and to what extent there has been a change in the parameters of the car's braking system, assessed during the technical inspection. Design/methodology/approach: Diagnostic tests were performed, braking force measurements on a roller device, the following were analyzed: differences in braking force on axle wheels, non-linear increases in braking force, deceleration of braking force, changes in the value of braking force. Findings: Changes in the technical condition of vehicle braking systems in 2022 compared to 2014 were demonstrated. Research limitations/implications: In the future, a trend line of changes in the technical condition of vehicle braking systems can be created. Practical implications: In the course of the research, it was found that the technical tests made it possible to determine the direction of positive changes in the technical condition of the braking systems in the tested vehicles, which translates into vehicle safety in road traffic. Originality/value: Changes in the condition of the brake system in 2022 compared to 2014. Keywords: Safety and quality of transport, braking system, changes of conditions. Category of the paper: Technical paper.
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