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Plasticity properties of advanced high-strength steel weld construction of transport means - simulation by the MESH-free method

Szczucka-Lasota Bożena, Uściłowska Anita, Węgrzyn Tomasz, Łazarz Bogusław

Transport Problems

2022

T. 17, z. 3

39--50

Advanced high-strength steel (AHSS) is being used increasingly often in the structure of means of transport. Welds made of these steels can crack in the heat-affected zone (HAZ) and have inferior mechanical properties compared to the base material. The goal of this paper was to solve the technological and material problem of obtaining highstrengh thin-walled welded structures of AHSS steel designed for heavily loaded elements of transport means. The novelty of the article is its presentation of a modified welding process which enables a high-strength structure of the obtained joint to be obtained without welding defects and incompatibilities. Copper backing was selected as an effective method of heat dissipation in the process, and, using the basic solutions method, the leverage of a heat flow process in the weld method deposit (WMD) was checked after cooling down the substrate. The fundamental solutions method was used to determine the optimal shape of the backing. It has been shown that the new backing affects the structure and mechanical properties of welds. In order to verify the newly developed method, tensile tests of the obtained joint were carried out, the hardness was assessed, the metallographic structure was analyzed, and non-destructive tests were performed. The developed material and technological solution were used, for example, for the construction of the arm element of the mobile platform.

Modernized MAG welding and stamping for heavily loaded truck chassis components

Szczucka-Lasota Bożena, Uściłowska Anita, Węgrzyn Tomasz, Piwnik Jan, Wilczyński Krzysztof Ireneusz, Cybulko Piotr

Transport Problems

2021

T. 16, z. 3

173--183

Both the processes of welding and stamping are becoming increasingly more common in the construction of means of transport. Heavily loaded vehicle components should have good plastic properties so that cracks do not occur under operating conditions. Welded joints often crack, especially when they are subjected to additional treatments, such as stamping. In this article, the possibility of MAG welding (Metal Active Gas) of low-alloy steel using (MJC) micro-jet cooling was checked. Then, the made joints were subjected to a stamping test. Weld metal deposit (WMD) was carried out for the classic MAG process and compared with the modern method using MJC. Joint sand stamping tests of low-carbon and low-alloy steel were carried out. Welding with micro-jet-cooling could be considered promising due to the useful structure of WMD. This structure yields better mechanical properties, i.e. higher impact toughness for subzero service. For the first time, it was decided to check the pressure of the sheets welded with an innovative welding process. Then, the samples obtained by welding were subjected to the process of stamping. The result of stamping of welded sheets was investigated. The results of stamping show that only after correct welding process might the expected mechanical properties be achieved.