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Requirements Relating to Manufacturing Constructions in The Aspect of Conducting Ultrasonic Testing

Kaczmarek R., Krawczyk R.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 3A

1633--1638

EN

Basic factors which have an influence on conducting manual ultrasonic testing of joints in the welded constructions are presented in the following article. These factors are specified on the base of the guidelines referring to conditions and methods of carrying out examinations which are currently in force in the following standards PN-EN ISO 17640 and PN-EN ISO 22825. Due to the vastness of subject of ultrasonic testing the main aim of the following article is to collect all important information which relates to design and manufacture of constructions and has a key influence on the following examinations.

PL

W pracy zawarto analizę podstawowych czynników mających wpływ na możliwość wykonania ręcznych badań ultradźwiękowych złączy w konstrukcjach spawanych. Czynniki te oparto na wymaganiach obowiązujących norm przedmiotowych PN-EN ISO 17640 i PN-EN ISO 22825 w odniesieniu do warunków oraz sposobu przeprowadzenia badań. Celem publikacji było omówienie najistotniejszych informacji dotyczących projektowania i wykonywania złączy mających kluczowy wpływ na późniejszą kontrolę ultradźwiękową.

2

The weldability assessment of thermally hardened S540Q steel sheets

Cicholska M.

Journal of KONES

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2014

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Vol. 21, No. 4

43--48

EN

High strength thermally hardened steels are more difficult to weld than low carbon construction steels. There is a danger of cold cracking caused by the presence of martensite in welded joints. The thermally hardened 12 mm sheets of S540Q steel underwent research. The sheets were welded semi-automatically by MAG method, in the welding conditions usually applied in industry for welding normalized sheets of this steel. The welding technology was presented. The X-ray tests were performer, which confirmed the achievement of metallically continuous joints. Samples were taken from the joints and the joints hardness distribution measurements were conducted. The microstructure was examined and the static tensile tests as well as technological bend tests were carried out. Hardness measurements were performed in three measurement lines for each joint according to PN-EN 1043-1:2000 requirements. Joints microstructures were examined in the joints axis, in HAZ and in native materials. Steel microstructures were classified as low carbon tempered matrensite of layered construction. Mean values of the selected joints tensile strengths were also presented. The tensile tests values of native materials of metallurgic certificates were given for the sake of comparison. The research results presented in the paper made it possible to determine the weldability of S540Q steel.

3

Suitability analysis of thermally hardened S540Q steel sheets for welded constructions working in low temperatures

Cicholska M.

Journal of KONES

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2013

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Vol. 20, No. 3

105--109

EN

The conventional heat treatment is being replaced by thermal-plastic treatment. The process of steel hardening is carried out on quenching press with a double-sided water spray at the temperatures ranging from 600 to 700°C. The steel hardening process is conducted at the temperatures of 600-700°C with cooling in the air. After this, thermal hardening the steel sheets obtain the structure of a layered tempered matrensite with carbide and cyanide disperse separations The thermally hardened S540Q steel sheets 12 mm thick underwent examinations. The welding technology was presented. The sheets were welded semi automatically by means of MAG method. The usual welding conditions normally applied in industry were used after steel standardisations. The achievement of joints metallically continuous was confirmed by X-ray tests. The static tensile test was conducted to assess the applicability of this steel. The average values of the welded joints resistance to tensile strength were given. After conducting technological bend, test good ductility was noted. Steel microstructure was defined as low carbon tempered matrensite of layered construction. Microstructure observation was carried out in the joint axis, in heat affected zone and in native material. Hardness measurements were performed according to PN-EN 1043-1:2000 requirements. Impact test was conducted on the samples with a V cut notch at the temperatures of -20, -40, -60 Celsius degrees.

4

Bezpieczeństwo konstrukcji spawanych z wykorzystaniem zaleceń Międzynarodowego Instytutu Spawalnictwa

Walat K., Łagoda T.

Spajanie Materiałów Konstrukcyjnych

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2011

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Nr 3 (13)

40--42

PL

W artykule przedstawiono analizę bezpieczeństwa konstrukcji spawanych w oparciu o zalecenia Międzynarodowego Instytutu Spawalnictwa (IIW). Uwaga została skupiona na problemie wyznaczania i oceny trwałości zmęczeniowej połączeń spawanych wybranych typów złączy, zgodnie z wytycznymi zawartymi w IIW.

EN

The paper contains considerations on safety of welded structures according to the requirements of the International Institute of Welding (IIW). Special attention is paid to determination and evaluation of fatigue life of some welded joints according to recommendations of IIW.

5

Suitability analysis of thermally hardened S620Q steel sheets used for welded constructions working in lowered temperatures

Cicholska M.

Journal of KONES

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2010

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Vol. 17, No. 4

103-108

EN

S620Q steel sheets 12 mm thick that were heat treated were subjected to research. The sheets weldability was examined during semi-automatic welding by MAG method, at the welding conditions usually applied in industry for welding normalized sheets of this steel. The achievement of metallically continuous joints was confirmed by X-ray examination, the correctness of making test joints was confirmed by the measurement of transverse warp and edges of sample sections. Moreover the following tests were carried out: static tensile tests, technological bending tests and impact tests on the samples with V-notch cut in positions S, P, C2 and C5. The joints microstructure was observed in the weld axis, in SWC and in native materials with the use of Neophot-2 optical microscope. Steel microstructure was classified as low-carbon, tempered martensite of layered construction. The bend tests were carried out by means of bending arbour 36mm in diameter. The impact energy values for test temperatures -60°C, -40°C and -20°C marked in the drawings are the mean values of breaking three samples at a given test temperature. The places ofnotches cuts applied on welded joints samples are required by Det Norske Veritas regulations for welded joints. Mechanical properties ofS620Q steel were given as reference.

6

Wpływ mikrostruktury na dekohezję ultraniskowęglowej stali bainitycznej o podwyższonej wytrzymałości

Pytel S. M., Tomaszewska-Górecka V.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

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1999

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Z. 68, t. 2

141--148

PL

Ultra niskowęglowe stale bainityczne o granicy plastyczności w zakresie 600-700MPa mogą być zastosowane w budowie wielkogabarytowych konstrukcji spawanych, szczególnie eksploatowanych w obniżonych temperaturach. W pracy przeprowadzono badania właściwości mechanicznych oraz odporności na pękanie próbek z blach grubych pochodzących z czterech wytopów laboratoryjnych. Ponadto dokonano analizy zjawisk strukturalnych zachodzących podczas odkształcania i pękania próbek wyciętych poprzecznie do kierunku walcowania pasma. Na podstawie przeprowadzonych eksperymentów omówiono różnice w mechanizmach pękania tych stali w zależności od wielkości, jednorodności oraz kształtu pierwotnego ziarna austenitu, a także morfologii wtrąceń niemetalicznych.

EN

The Ultra-Low Carbon Bainitic (ULCB) Steels with improved mechanical and technological properties are the potential candidates as the structural materials for large dimension welded constructions especially those utilized in low temperatures. This short paper presents the experimental results of four laboratory heats characterized od yield strength in range of 600-700 MPa. The fracture toughness as well as the microstructural phenomena occuring during the deformation and fracture of the samples examined in accordance to the standard as well as the fracture mechanics tests have been described. As the results of these investigations some substantial differences occuring in the fracture modes of ULCB steels have been presented and briefly discussed.