Browsing by Author "Pilarczyk, Jan"

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Access status: Open Access ,
Wpływ technologicznych parametrów napawania brązu na podłoże stalowe na wybrane właściwości użytkowe napoin
(Data obrony: 2007) Góral, Tomasz
Wydział Inżynierii Mechanicznej i Robotyki
The influence of the selected parameters pad welding by the MIG method of the tin bronze CuSn6 pad welding on the difficult - to - weld steel (steel type 45) on the chosen properties of welds was discussed. The investigations ware made to determine the ranges of the technological parameters of the padding which guaranteed an adequate quality of the welds. Using mathematical planning of experiment showed the influence of the technological parameters of the padding on the geometry of the bronze layer. The influence of the selected parameters of the tin bronze pad welding on steel on the chosen properties of welds also was discussed. The technological parameters were held constant during the padding which guaranteed an adequate quality of the welds and a small base material fraction for investigations usable properties. The influence of the pitch of runs was definited during investigations on the geometry of the bronze layer. Hardness was assigned for padding welds, the base material and the zone between padding weld and base material. Detection of possible internal defects of padding welds was the aim of metallographic and X-ray radiography investigations of welds. The bend test was used to assess the level of the weld adhesion to the base material. The hardness investigations showed the influence of the number of bronze layers on their hardness. The essential influence of the surfacing process on the hardness of the base material was not found. The normal bend test showed the good adhesion of the surfacing layer and steel. The presence of the smali defects did not have the essential influence on the usable properties padding welds. The results of tribological tests of single and two layer CuSn6 bronze welds of padded on the steel base were compared with these for the cast bronze of the same chemical composition. Friction coefficients and linear wear of pairs under sliding were measured for the lubricating environment of mineral and synthetic oils. The investigation revealed the dependence of friction coefficient on the number of layers in the weld pad and on the lubricating environment. Differences were not observed for the linear wear of layered and comparative samples working in the environment of synthetic and mineral oil.