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Abstract:

The paper describes the study of porous layers formation process made with Fe on the carbon steel base. To form the layer there was used method of consisting combination of pulse microwelding paste layer on the S235 steel surface. The paste layer was combined as a mixture of different powders like Fe2O3, Fe, Cu and mineral oil. The resistive pulse microwelding techniques were applied on the layer. Whole process of applying layers was controlled manually. The deposit was sintered with reduction oxides in dissociated ammonia. There was prepared mixture of iron powder ASC 100.29, ASC 100.24, Distaloy SE (source: the Hoganas company) and iron oxide in various compositions. To mixtures there were also added Cu, in order to improve the layer properties after sintering. Because the base material and the paste composition are being very similar by the chemical composition, only Cu has been recognized as the best key indicator enabling diffusion proccess study. Therefore Cu plays the role of an indicator that allows the assessment of the sintering properties, including the depth of diffusion. The layers were investigated with metallographic methods and EDS analyses. Using EDS analysis, there were identified a types of alloying elements and the extent of diffusion from Fe foam into to S235 steel. Also, there was investigated microhardness by Vicers method. Microscopic examination was carried out to examine the structure of formed layers. Image analysis methods were used to measure the size of the cross-section porosity. Studies have determined basic quality parameters of the covered layers.

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The Selected Properties of Porous Layers formed by Pulse Microwelding Technique