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Jacek Dudkiewicz, Bronisław Gosowski and Piotr Organek
In practice, in the design stage of revitalization, renovation or reinforcement, there is often a need to determine the strength of steel as well as its weldability. The strength of steel can be determined in two ways: directly through destructive testing or indirectly - by the Brinell hardness test. In the case of weldability, this turns out to be much more difficult, because there are three groups of factors which determine this property, i.e.: local weldability, operative weldability, and overall weldability. This paper presents the results of the verification of the relationship between the hardness and strength of three grades of steel from the early twentieth century. The evaluation of the overall weldability of structural steels is discussed in an analytical approach preceding costly weldability tests. An assessment based on selected indicators of weldability can only lead to confusion.
Hulls of ships are often made of steel, which are produced under the supervision of classification societies. Usually, the hull steel of ordinary strength category A is used for the ship's shell (the yield strength is 235 MPa and the impact strength 27 J at 20ºC). Vessels sail in sea areas with various levels of salinity and thus with different corrosiveness. The average salinity of the seas is taken as 3.5% content of sodium chloride. This article presents the results of corrosion tests of S235 JRG1 steel in an aqueous solution in which the mass fraction of sodium chloride was: 0.7%, 1.4%, 2.2%, 2.8%, 3.5% and 4.2%. Corrosion tests were performed using the potentiodynamic method. As parameters characterizing the corrosion properties of the tested steel, the corrosion current density and corrosion potential were assumed. Statistically significant influence of seawater salinity on the corrosion properties of hull structural steel of ordinary strength of category A was found. The highest value of the corrosion current density was observed in the solution containing 3.5% NaCl mass fraction was observed. In seawater with a sodium chloride content in the range of 0.7 to 3.5%, an increase in the value of the corrosion current density was observed, along with the increasing share of NaCl. In seawater with higher salinity, the corrosion rate was reduced. The corrosion potential of S235JRG1 steel decreases with the NaCl content in the corrosive solution. The susceptibility of this material to corrosion in seawater increased.
This study aims to assess fatigue property by the static overload and average load in the fillet welded joints which is on the ship structural steel having gusset welds. To this end, a small specimen was made, to which the same welding condition for the actual ship structure was applied, to perform fatigue tests. In this study, a method to simply assess changes in welding residual stress according to different static overload was suggested. By measuring actual strain at the weld toe, the weld stress concentration factor and property which is determined by recrystallization in the process of welding were estimated to investigate the relation between overload and fatigue strength.
E. Tasak, A. Ziewiec, A. Zielińska-Lipiec and K. Ziewiec
There is a problem in obtaining a suitable impact strength of the padding weld after cladding with a martensitic filler metal. Too low annealing temperature below 580°C and the excessive annealing temperature above 650°C do not provide adequate impact strength of the padding weld. A heat treatment technology for mixed joints has been developed based on the results of the microscopic observations, X-ray diffraction measurements and transmission electron microscope examination. The problem was identified and a special technology of heat treatment for the dissimilar joint was elaborated. This technology provides a high impact resistance of the padding weld and an appropriate properties of the base material.
T., Wach A.: The Effect of Fine Non-Metallic Inclusions on The Fatigue Strength of StructuralSteel. Archives of Metallurgy and Materials 60 (1) (2015) 65-69.
8. Wołczyński W., Guzik E. Wajda W. Jedrzejczyk D. Kania B., Kostrzewa M.: Cet In Solidifying Roll – Thermal Gradient Field Analysis. Archives of Metallurgy and Materials 57 (2012) 105-117.
9. Ulewicz R., Novy F., Selejdak J. Fatigue Strength of Ductile Iron in Ultra-High Cycle Regime. Advanced Materials Research 874 (2014) 43-48.
10. Roiko A., Hänninen H., Vuorikari H.: Anisotropic
vobodova J. 2013. Microstructural evaluation of the lacquered layer quality after corrosion load,. Production Engineering Archives, Volume 6, No. 1, 45-48.
10. U lewicz R., M azur M. 2015. Fatigue testing structuralsteel as a factor of safety of technical facilities maintenance, Production Engineering Archives, Volume 1, No. 1, 32-34.
11. V ičan J., K oteš P., Ś piewak A., U lewicz M. 2016. Durability of bridge structural elements , Communication 18(4), 61-67.
12. V ičan J., U lewicz M., C hwastek A. 2015. Assessing the corrosion impact