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Wyszukujesz frazę "underwater wet welding" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Weldability of high strength steels in wet welding conditions
    Autorzy:
    Fydrych, D.
    Łabanowski, J.
    Rogalski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/258484.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    underwater welding
    steel weldability
    cold cracking
    wet welding
    cracks in welds
    improving weldability
    Opis:
    In this paper are characterized problems of high strength steel weldability in underwater wet welding conditions. Water as a welding environment intensifies action of unfavourable factors which influence susceptibility to cold cracking of welded steel joints. The susceptibility to cold cracking of S355J2G3 steel and S500M steel in wet conditions was experimentally estimated (by using Tekken test). It was concluded that the steels in question are characterized by a high susceptibility to formation of cracks in welds. Usefulness of the proposed Temper Bead Welding technique (TBW) was experimentally verified as a method for improving weldability of the steels in the analyzed conditions.
    Źródło:
    Polish Maritime Research; 2013, 2; 67-73
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underwater wet repair welding of API 5L X65M pipeline steel
    Autorzy:
    Rogalski, G.
    Fydrych, D.
    Łabanowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/258860.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    underwater welding
    wet welding
    underwater pipeline
    API 5L X65M steel
    Opis:
    This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over an assumed acceptance criterion for welded joints in pipes without anticorrosion polymer insulation, were identified. A significant effect of polimer insulation on structure and properties of welded joints, was found.
    Źródło:
    Polish Maritime Research; 2017, S 1; Bibliogr. 27 poz., rys., tab.
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of process stability and weld quality of underwater wet flux-cored arc welding of low-alloy high-strength steel with oxy-rutile wire
    Autorzy:
    Li, Hongliang
    Liu, Shixiong
    Ma, Qiang
    Wang, Pengfei
    Liu, Duo
    Zhu, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/1955594.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    arc stability
    weld quality
    low alloy high-strength steel
    underwater wet welding
    Opis:
    The paper described the experimental findings of underwater wet welding of E40 steel using self-shielded flux-cored wire with a TiO2 -FeO-MnO slag system. The arc stability, weld quality and corrosion resistance with different heat inputs were studied. The results showed that the wet welding process of the designed wire displayed good operability in the range of investigated parameters. The microstructure and mechanical properties of the weld metal depended on the heat input. Due to the high fraction of acicular ferrite in the weld metal, the mechanical properties of the weld metal under low heat input had better tensile strength and impact toughness. Fracture morphologies at low heat input had uniform and small dimples, which exhibited a ductile characteristic. The diffusible hydrogen content in the deposited metal obtained at a heat input of 26 kJ/cm significantly reduced to 14.6 ml/100g due to the combined effects of Fe2 O3 addition and the slow solidification rate of molten metal. The microstructure also had a significant effect on the corrosion resistance of the weld metal. The weld metal with high proportions of acicular ferrite at low heat input exhibited the lowest corrosion rate, while the base metal possessed a reduced corrosion resistance. These results were helpful to promote the application of low alloy high strength steel in the marine fields.
    Źródło:
    Polish Maritime Research; 2021, 3; 100-109
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cold cracking of S460N steel welded in water environment
    Autorzy:
    Tomków, J.
    Łabanowski, J.
    Fydrych, D.
    Rogalski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/258574.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    underwater welding
    wet welding
    high-strength low-alloy steel
    cold cracking
    CTS test
    Opis:
    This paper shows results of weldability testing of fine-grained high -strength low- alloy S460N steel welded in water environment by covered electrodes. The tests were carried out by using the CTS test specimens with fillet welds. Four specimens were welded under water and one specimen in air. Welded joints were subjected to non-destructive visual and penetration tests. The accepted joints were then subjected to macroscopic and microscopic inspection and Vickers hardness measurements as well. The experiments showed that S460N steel welded in water environment is characterized by a high susceptibility to cold cracking.
    Źródło:
    Polish Maritime Research; 2018, 3; 131-136
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bead-on-Plate Underwater Wet Welding on S700MC Steel
    Autorzy:
    Tomków, Jacek
    Świerczyńska, Aleksandra
    Landowski, Michał
    Wolski, Adrian
    Rogalski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2023305.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    MMA welding
    high-strength steel
    underwater wet welding
    covered electrode
    Opis:
    The participation of high strength steels in marine and offshore structures is increasing, which makes it necessary to develop recommendations for underwater repair welding works. The article presents the results of bead-on-plate welded specimens made of S700MC high strength steel in underwater wet welding conditions by covered electrodes. Three specimens with heat input values in the range 0.91-1.05 kJ/mm were made. The specimens were subjected to visual, metallographic, macro- and microscopic tests as well as hardness measurements using the Vickers method. It was found that the higher heat input leads to formation of mixed bainite-martensite microstructure in the heat-affected zone (HAZ). Lower heat input value results in presence of martensite in HAZ. It was shown that in the scope of the performed tests, the maximum hardness of HAZ did not exceed the critical value for the material group, and the increase in heat input caused the decrease of hardness by about 25 HV10.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 3; 288-296
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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