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

100%

Cicholska M.

2013

tom Vol. 20, No. 3

105--109

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.

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

100%

Cicholska M.

tom Vol. 17, No. 4

103-108

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.

Bezpieczeństwo konstrukcji spawanych z wykorzystaniem zaleceń Międzynarodowego Instytutu Spawalnictwa

63%

Walat K. , Łagoda T.

2011

tom Nr 3 (13)

40--42

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.

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.

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

63%

Kaczmarek R. , Krawczyk R.

Archives of Metallurgy and Materials

2015

tom Vol. 60, iss. 3A

1633--1638

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.

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.