This paper describes the study of corrosion resistance of 304 stainless steel joint welded with different heat input in the material. The welding was done with classic methods and their low energy varieties. The structure and properties of austenitic steels joints strongly depend on the level of heat input in the material. Electrochemical corrosion resistance tests were carried out in 5% NaCl solution. The obtained results show the decrease of corrosion resistance of tested joints in comparison to the base material.
In this work, a model of phase transformations during multipass weld surfaced steel casts is presented. In the temperature field calculation algorithm, the influence of the heat of overlaying beads and a self-cooling of previously overlayed beads have been taken into account. The fusion area, full and part transformation zones, by solidus, A 1 and A 3 and A 1 temperatures has been determined, respectively. The temperatures of the beginning and the end of the phase changes during cooling were determined on the basis of the timetemperature-transformation welding diagram. In the phase change kinetic description, the JMAK law and KM formula were used. Theoretical considerations are illustrated by example of volume share calculations of particular structural components during the weld surfaced 230-450 W steel cast. The results of computation in the graphical forms are presented: welding thermal cycle diagrams and structural share change histories at selected points, as well as temperature and the phase share distributions in cross section.MSC 2010: 74F05, 74A50, 80A20
This article describes the problems of welding high strength steel. One of the problem is using correct formula to calculate the carbon equivalent. This paper presents different methods of calculating necessary preheating temperature dependent on welding parameters. Preheating temperature is important in order to avoid cold cracking. The mechanical properties of joints weld without preheating temperature was rated.
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