Temat: welded joints - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Comparative analysis of welded and adhesive joints strength made of acid-resistant stainless steel sheets
Autorzy:: Rudawska, A.
Pawlak, P.
Miturska, I.
Stančeková, D.
Chyra, M.
Tematy:: adhesive joints
welded joints
strength
acid resistant steel; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102070.pdf Link otwiera się w nowym oknie
Opis:: The article presents the selected results of strength tests on the effectiveness of bonding high-alloy steel 1.4310. Sheet steel is one of the materials that are difficult to activate energy. Effective joining of it is difficult, requires selection of the appropriate bonding technology. The paper focuses on the comparative tests of shear strength of one-single lap welded and bonded joints. The welding process was performed on 3 groups of samples TIG welding and argon, where the variable value of the welding process was current: 60A, 70A, 80A. The adhesion process was performed in 6 groups of samples which differed in the method of surface preparation and the type of the adhesive. Adhesive joints were made by using adhesive of epoxy resin and a hardener: Epidian 61/TFF at a mass ratio of 100:22 and Epidian 61/IDA at a mass ratio of 100:40. As a way of surface preparation applied 3 different, but simplified and environmentally friendly methods of surface preparation: degreasing with using cleaner Loctite 7061, abrasive machining with P320 and degreasing and grinding with abrasive T800 and degreasing were used. Make joints and curing the adhesive joints were carried out at ambient temperature. Analyzed the joints were tested destructive – which set out the shear strength, in accordance with DIN EN 1465 on the testing machine Zwick / Roell Z150. Based on the results of the research it was found that better results were obtained for the maximum welded joints, but this result was similar to the maximum value of the strength of the adhesive bond.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Verification of the Computed Tomography Results of Aluminum Alloy Welded Joint
Autorzy:: Malicki, M.
Sobczak, K.
Tematy:: computed tomography
CT
welded joints
defects
microcracks; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/97855.pdf Link otwiera się w nowym oknie
Opis:: Computed tomography (CT) of aluminum welded joint specimen has been performed. On the tomographic cross sections some defects have been found. To verify them the metallography cross sections of welded has been done. It was found that selected defects are micro cracks.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Determination of Strain and Stress Fields in Welded Joints of S960-QC Steel
Autorzy:: Pała, T.
Dzioba, I.
Tematy:: welded joints
strain distributions
strength characteristics
FEM; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352759.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of two butt welded joints by conventional method. The welding process was performed using a variety of linear welding energy. The studies included experimental and computational part. In experimental studies determined the distribution of hardness and mechanical properties of the individual analyzed sections of welded joints. The data obtained were intended to determine the extent of zones in the welded joints that have certain strength characteristics. Also conducted uniaxial tensile tests of welded joints with the registration of displacement fields on the surface of specimens by means of Aramis video-system what the final result are images of strain fields map on the surface of welded joints. The resulting strain values were compared with the results of numerical computations FEM.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Braze Welding TIG of Titanium and Aluminium Alloy Type Al – Mg
Autorzy:: Winiowski, A.
Majewski, D.
Tematy:: braze welding
aluminium alloy
titanium
mechanical properties of braze welded joints
structural properties of braze welded joints
braze welding parameters; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351426.pdf Link otwiera się w nowym oknie
Opis:: The article presents the course and the results of technological tests related to TIG-based arc braze welding of titanium and AW-5754 (AlMg3) aluminium alloy. The tests involved the use of an aluminium filler metal (Al99.5) and two filler metals based on Al-Si alloys (AlSi5 and AlSi12). Braze welded joints underwent tensile tests, metallographic examinations using a light microscope as well as structural examinations involving the use of a scanning electron microscope and an X-ray energy dispersive spectrometer (EDS). The highest strength and quality of welds was obtained when the Al99.5 filler metal was used in a braze welding process. The tests enabled the development of the most convenient braze welding conditions and parameters.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Problemy trwałości zmęczeniowej połączeń spawanych wykonanych ze stali S890QL
Problems of fatigue life of welded joints made of S890QL steel
Autorzy:: Goss, C.
Marecki, P.
Tematy:: niskocyklowa wytrzymałość zmęczeniowa
fatigue life
welded joints; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/208508.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono wybrane wyniki badań statycznych i zmęczeniowych próbek ze stali S890QL. Zaprezentowano także wyniki przeprowadzonych prób statycznych i zmęczeniowych próbek połączeń spawanych z tej samej stali, a także wyniki pomiarów naprężeń własnych spawanego połączenia czołowego. Dokonano porównania wartości współczynnika spiętrzenia naprężeń αk wyznaczonych na drodze obliczeniowej i za pomocą modelowania numerycznego.
In this paper, some selected results of static and low cycle fatigue tests of S890QL steel are presented. The paper also shows the results of static and low cycles fatigue tests of welded joints made of S890QL steel and measurement residual stresses. A value of coefficient intensity factor obtained from calculations and numerical modeling was compared.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Radiographic quality assessment of welded joints in building structures produced according to requirements of standard EN-1090-2, quality level "B +"
Radiograficzna ocena jakości złączy spawanych w konstrukcjach budowlanych wykonywanych według wymagań normy EN-1090-2, na poziomie jakości "B+"
Autorzy:: Staniszewski, K.
Sikora, S.
Czuchryj, J.
Tematy:: złącza spawane
jakość B
welded joints
quality B; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/350886.pdf Link otwiera się w nowym oknie
Opis:: While assessing the quality of welded joints it may become necessary to establish various quality levels in the same joint or implement specific requirements for an already adopted quality level. The latter case can be observed in standard EN 1090-2, in which additional requirements were adopted for quality level B and thus a new quality level designated as B+ was created. Most of the additional requirements are concerned with imperfections detected by means of radiography. For this reason it was necessary to compare the principles governing the assessment of the quality of welded joints from radiographic examination point of view, according to the requirements of standard EN ISO 5817 and those of EN 1090-2. A conducted comparative analysis aims at optimising the aforesaid principles in relation to the requirements presented therein.
Podczas określania jakości złączy spawanych może być konieczne ustalenie różnych poziomów jakości w tym samym złączu lub wprowadzenie szczególnych wymagań dla przyjętego poziomu jakości. Ostatni przypadek zaobserwowano w nowej normie EN 1090-2, w której dla poziomu jakości B ustalono wymagania dodatkowe. Nowy poziom jakości oznaczono symbolem B+. Większość dodatkowych wymagań dotyczy niezgodności wykrywanych metodą radiograficzną. Z tego powodu porównano zasady oceny jakości złączy spawanych z punktu widzenia kontroli radiograficznej według wymagan norm EN ISO 5817 i EN 1090-2. Przeprowadzona analiza porównawcza powinna przyczynić się do zoptymalizowania tych zasad ze względu na przedstawione w normach wymagania.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Technological Aspects of Execution of Welded Joints in Hollow Sections
Autorzy:: Kuchta, K.
Silezin, R.
Żwirek, P.
Tematy:: steel structures
lattice structures
welded joints
hollow section; Pokaż więcej
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/104810.pdf Link otwiera się w nowym oknie
Opis:: Steel structures designed according to Eurocode 3 are executed in accordance with the provisions of the standard PN-EN 1090-2, which is referred to in Eurocode 3. In addition, the standard PN-EN 1090-2 refers to in its content a number of welding standards, e.g. PN-EN ISO 9692-1. These standards provide guidelines for welded connections, which should be applied in the case of joints connecting steel hollow sections. Analysis of above-mentioned provisions revealed that for fillet welds they are simultaneously fulfilled only if the inclination angles of the elements are in the range of 70°-100°. According to recommendations of PN-EN 1993-1-8 and EN 1090-2, the same weld type around the perimeter of the element connected to the chord of lattice structure is possible to execute only for inclination angle lower than 60°. Discrepancies between these standards also exist with regard to the interpretation of the dimension of the flare groove welds in connections of rectangular hollow sections with the same width. In addition, analyses of the recommendations for welding in cold-formed zones indicate that, for steel grades currently used for the production of cold-formed rectangular hollow sections, welding in these zones is not permitted only for profiles with wall thickness equal to 12.5 and 16 mm. The above-mentioned issues point out the need for mutual unification of standards for the design and execution of steel joints in hollow sections.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Verification of strength of the welded joints by using of the aramis video system
Autorzy:: Pała, T.
Dzioba, I.
Gałkiewicz, J.
Tematy:: high-strength steel
laser welded joints
tensile properties
fracture toughness; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/386835.pdf Link otwiera się w nowym oknie
Opis:: In the paper are presented the results of strength analysis for the two types of the welded joints made according to conventional and laser technologies of high-strength steel S960QC. The hardness distributions, tensile properties and fracture toughness were determined for the weld material and heat affect zone material for both types of the welded joints. Tests results shown on advantage the laser welded joints in comparison to the convention ones. Tensile properties and fracture toughness in all areas of the laser joints have a higher level than in the conventional one. The heat affect zone of the conventional welded joints is a weakness area, where the tensile properties are lower in comparison to the base material. Verification of the tensile tests, which carried out by using the Aramis video system, confirmed this assumption. The highest level of strains was observed in HAZ material and the destruction process occurred also in HAZ of the conventional welded joint.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Introduction to the examination of thin-walled structures using the vibrodiagnostic method
Autorzy:: Szeleziński, Adam
Muc, Adam
Murawski, Lech
Doan, Do Van
Tematy:: welding
welded joints
non-destructive testing
vibrations
time–frequency characteristics; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242147.pdf Link otwiera się w nowym oknie
Opis:: The article presents a methodology of non-destructive diagnostic vibratory tests of welded plates with geometrical parameters that classify them into a group of thin-walled panels. On the basis of such plates, most ship constructions are created. In previous works, the authors dealt with the study of welded joints in plates with significant thicknesses and developed for them a number of methods for assessing the quality of welded joints. Vibrodiagnostics is a NDT method that allows the use of a variety of techniques and tools. It enables measurements to be made in both a contact and non-contact way depending on the requirements of the structure and the environment. Vibrodiagnostic method is one of the most modern NDT methods, which uses modern measurement tools and computer analysis of data. On the basis of the developed methods, the authors intend to verify their application to plates from real welded constructions, which will be performed in typical shipyard conditions by welders. Such tests are important due to their use for the construction of a real SHM ship construction monitoring system. These methods allow for the examination of the condition of ships’ structural plates and can detect defects in welded joints that prevent ships from operating under severe sea conditions. The article presents the laboratory stand, the sensor layout, results, and their initial analysis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Diagnostic benchmarks on dynamic characteristics of thin-walled marine damaged structures
Autorzy:: Szeleziński, Adam
Murawski, Lech
Muc, Adam
Tematy:: thin-walled structures
welded joints
SHM
spectrum analysis
damping decrement; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/2064867.pdf Link otwiera się w nowym oknie
Opis:: Among structural health monitoring (SHM) methods of thin-walled structures, a vibrodiagnostic method is one of the most promising. The accelerometer recorded responses provide diagnostic information that requires mathematical processing to extract the essential dynamic characteristics. The authors have been looking for new parameters - diagnostic benchmarks which can be applied to non-destructive, automatic testing of thin-walled marine structures (especially their welded joints) like ship hulls. All characteristics have been based on recorded data generated during the vibration tests of welded joints with and without failures. For this purpose, the authors proposed method based on: FFT windowing analysis, benchmark with using 2D or 3D time – frequency dynamic characteristics and the determination of damping decrement in function of time. The work presents the algorithm and exemplary results obtained from the application of proposed method to several selected sample plates with different type of welds.
Dostawca treści:: Biblioteka Nauki

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