Wyniki wyszukiwania - BazTech

1

Thermal Phenomena Related to Plastic Deformation During Tensile Testing and Their Microscopic Interpretation

Ostromęcka Małgorzata, Siwiec Jakub

Problemy Kolejnictwa

|

2022

|

Z. 195

121--128

EN

Thermal phenomena related to plastic deformation can be commonly observed. By simply touching a ruptured or bent sample, it is clear that the temperature has risen at the deformation site. Such observations can be carried out for qualitative or quantitative assessment. This paper serves to qualitatively relate the changes in the structure of the deformed material to the temperature increase observed with an infrared camera.

2

Effect of Forge Application on Microstructural and Mechanical Properties of AISI 316 Using Direct Drive Friction Welding Process

Hassan Jabbar A., Boukharouba T., Miroud D.

Archives of Metallurgy and Materials

|

2022

|

Vol. 67, iss. 3

987--992

EN

Present study introduces effect of forge application and elimination on microstructural and mechanical properties of AISI 316 during friction welding. Temperature measurements, microstructure, micro-hardness, tensile test, scanning electron microscopy and X-ray diffraction were evaluated. Maximum temperature recorded was 819°C while forge was applied between 357°C-237°C. Thermo-mechanically affected zone and highly plastically deformed zone were created at the interface at elimination and application of forge respectively. Ultimate tensile strength decreased and ductility increased when forge elimination compared to forge application. Tensile fracture was occurred adjacent to the welding interface for both cases, though, after forge application, ductile fracture mode and cleavage features through the fingerprints were observed in the fracture morphology. Redistribution and concentration of gamma iron in 111 level after forge application and heat treated of AISI 316.

3

Improving the quality of the friction welding process of steel components

Pacana Andrzej, Czerwińska Karolina

System Safety : Human - Technical Facility - Environment

|

2021

|

Vol. 3, nr 1

47--54

EN

The aim of the study was to implement an integrally configured method of quality control of frictional welding of piston forgings intended for Diesel Man trucks. The use of the method (consisting of the 5W2H method, the Ishikawa diagram and the ABCD - Suzuki method) would contribute to the detection of the causes of non-compliance and consequently to the elimination of non-compliant products. Steel pistons have become the subject of research due to significant problems with maintaining their expected level of quality after the introduced structural and technological changes. The proposed method has helped to identify the root cause of non-compliance. It was: incorrect design of the combustion chamber in terms of diameter and depth. The study shows that it is advisable to use an integrated approach to finding the causes of quality problems on the example of the friction welding process. This was a new solution for the company, as no in-depth analyses of quality problems using a sequence of quality management techniques have been carried out so far.

4

Innovative technology of friction welding of steel studs to HSS and UHSS sheets or plates

Klimpel Andrzej

Fastener : rynek elementów złącznych

|

2021

|

nr 2-3

49--51

EN

The paper describes an innovative technology of robotic friction welding of steel studs to the surface of HSS and UHSS sheets and plates of structures, in all welding positions. It specifies basic parameters of the process of friction welding of steel studs to HSS and UHSS sheets and plates. This process ensures a significant increase in the quality and mechanical properties of stud + sheet/plate joints, great ease in controlling welding parameters and monitoring the quality of the welding process, as well as high cost-efficiency and safety of operation. A station for robotic friction stud welding equipped with a real-time monitoring and control system for the quality of welded joints is also described.

5

Solid-state welding of ultrafine grained copper rods

Morawiński Łukasz, Jasiński Cezary, Ciemiorek Marta, Chmielewski Tomasz, Olejnik Lech, Lewandowska Małgorzata

Archives of Civil and Mechanical Engineering

|

2021

|

Vol. 21, no. 3

31--43

EN

The article focuses on the Direct Drive Rotary Friction Welding of ultrafine-grained copper rods, which feature increased mechanical properties and good electrical properties, yet are limited in size. The use of UFG metals is often limited by the too small dimensions of semi-finished elements produced by SPD methods. Therefore, the production of finished machine parts from UFG metals is currently economically unjustified. Dismissal of dimensional limitations can be done by introducing joining to technological processes. The proposed joining method does not lead to a melting of the material in the joining zone or excessive degradation of the UFG microstructure. To obtain the best results, the research used the method of low-energy welding of two kinds of specimens: with a flat or a conical contact surface. In the article, the authors present, by means of metallographic microsections and microhardness measurements, the influence of rotational speed, welding pressure and conical shape contact surface on the quality of the obtained joints. The conducted research made it possible to obtain good quality joints whose microhardness is reduced only by about 10% in comparison with the base material and the tensile strength dropped from only 397–358 MPa.

6

Rotary friction welding of Al/Al2O3 Composites with Aluminium Alloys

Siedlec Robert, Strąk Cezary

Welding Technology Review

|

2020

|

R. 92, nr 6

23--34

EN

Friction welding is one of the most economical process of joining solid-state materials. This technique allows to weld similar and dissimilar materials in a very short time. Friction welding of metal with composites gives new possibilities of application, due to the fact that materials have different physical and mechanical properties. In the study, aluminum alloy 44200 was friction welded to Al/Al2O3 composite. In addition, the following inspections were performed: optical microscopy, microhardness measurements and also tensile strength for all joints produced by friction welding. All of the studies were performed to evaluate the quality of connection between the 44200 alloy and the composites on the aluminum alloy matrix reinforced with ceramic phase of Al/Al2O3.

PL

Zgrzewanie tarciowe to jedna z bardziej ekonomicznych metod trwałego łączenia materiałów w stanie stałym. Metoda ta umożliwia wykonywanie złączy zarówno jednoimiennych, jak i różnoimiennych w bardzo krótkim czasie. Zaletą zgrzewania tarciowego jest możliwość uzyskania złączy o wysokiej jakości. Zgrzewanie tarciowe kompozytów z metalami, stwarza nowe możliwości aplikacji, z uwagi na fakt, że oba materiały posiadają różne właściwości fizyczne oraz mechaniczne. W pracy przeprowadzono próby spajania stopu aluminium EN-AC-44200 z kompozytami Al/Al2O3. W opracowaniu przeprowadzono następujące badania złączy stop aluminium-kompozyt uzyskanych metodą zgrzewania tarciowego: mikroskopowe, twardości, mechaniczne (pomiar wytrzymałości na rozciąganie). Wykonane badania miały na celu ocenę jakości połączenia pomiędzy stopem 44200, a kompozytami na osnowie stopu aluminium wzmacnianymi fazą ceramiczną Al/Al2O3.

7

Application of a device for the production of electrovalves by High Speed Friction Welding HSFW and FSW welding

Miara Damian, Matusiak Jolanta, Pietras Adam, Świetlik Mateusz, Zitti Saverio

Welding Technology Review

|

2019

|

R. 91, nr 11

33--40

EN

In order to meet the current requirements of the automotive industry, associated with the creation of a machining center for the production of cylindrical welded and turned components for the construction of solenoid valves, innovative technologies are needed for joining different materials of construction. The article presents the results of the research on the applicability, production of steel electrovalves elements in the AISI303 and 11SMnPb30 grades, an innovative solution consisting in the combination of HSFW high speed friction welding and friction welding using the FSW method. As part of the research, inter alia, a welding station, selection of the shape and dimensions of tools, selection of welding parameters for the HSFW / FSW method, and tests of mechanical properties of the resulting joints were carried out. The obtained results indicate that the obtained connections are characterized by high and reproducible quality.

PL

W celu spełnienia obecnych wymagań branży motoryzacyjnej, związanych ze zbudowaniem centrum obróbczego do wytwarzania cylindrycznych komponentów zgrzewanych i toczonych do budowy elektrozaworów, potrzebne są innowacyjne technologie łączenia różnoimiennych materiałów konstrukcyjnych. W artykule przedstawiono wyniki badań dotyczące możliwości zastosowania, do produkcji elementów elektrozaworów ze stali w gat. AISI303 oraz 11SMnPb30, innowacyjnego rozwiązania polegającego na połączeniu technologii zgrzewania tarciowego wysokoobrotowego HSFW oraz zgrzewania tarciowego metodą FSW. W ramach badań opracowano m.in. stanowisko do zgrzewania, dokonano doboru kształtu i wymiarów narzędzi, doboru parametrów zgrzewania dla metody HSFW/FSW oraz przeprowadzono badania własności mechanicznych powstałych złączy. Uzyskane rezultaty wskazują, że otrzymane połączenia cechują się wysoką i powtarzalną jakością.

8

Friction Weldability of UFG 316L Stainless Steel

Skowrońska B., Chmielewski T., Pachla W., Kulczyk M., Skiba J., Presz W.

Archives of Metallurgy and Materials

|

2019

|

Vol. 64, iss. 3

1051--1058

EN

The broad range applications of Ultra-Fine Grained metals is substantially limited by the lack of a welding method that allows them to be joined without losing the strong refinement of structure. From this point of view, the solid state welding processes are privileged. Friction welding tests were carried out on UFG 316L stainless steel. A joining process at high temperature activates the recrystallization, therefore the friction welding parameters were selected according to the criterion of the lowest degree of weakness due to recrystallization in the heat affected zone. In order to characterize the structure of basic material and selected areas of the obtained joint, were performed SEM, TEM and metallographic examinations in terms of hardness and range of softening of the material and tensile test. Despite the short time and relatively low welding temperature, results of the test by scanning electron microscopy and transmission electron microscopy confirmed the loss of the primary ultrafine structure in the Heat Affected Zone of welded joint.

9

Innowacyjne technologie spawania i zgrzewania złączy doczołowych szyn ze stali HSS trakcji kolejowej dużej prędkości

Klimpel A.

Stal, Metale & Nowe Technologie

|

2018

|

nr 5-6

126--130

PL

W artykule opisano stosowane aktualnie w przemyśle technologie spawania termitowego i zgrzewania oporowego iskrowego szyn trakcji kolejowych dużej prędkości oraz nowoczesne stale niskostopowe bezwęglikowe bainityczne, zapewniające wysokie własności mechaniczne i trybologiczne szyn. W celu znacznego zwiększenia jakości złączy doczołowych szyn i ekonomiczności procesu łączenia zaproponowano dwie innowacyjne technologie łączenia szyn: spawanie laserowe oraz zgrzewanie tarciowe wibracyjne.

EN

The article describes currently used technologies of the thermite welding and resistance flash welding of the butt joints of high-speed rails and modern low-alloy, carbidefree bainitic steels, that ensure high mechanical and tribological properties of rails. In order to significantly increase the quality of the butt joints of rails and the cost-effectiveness of the joining process, two innovative rail joining technologies have been proposed: laser welding and vibration friction welding.

10

Zgrzewanie tarciowe ultradrobnoziarnistej stali 316L

Skowrońska B., Siwek P., Chmielewski T., Golański D.

Przegląd Spawalnictwa

|

2018

|

R. 90, nr 5

151--154

PL

W artykule omówiono problematykę zgrzewalności metali o ultradrobnoziarnistej strukturze. Problem omówiono na przykładzie stali 316L o ultradrobnoziarnistej strukturze uzyskanej na drodze obróbki plastycznej hydrostatycznego wyciskania. Złącza uzyskano metodą zgrzewania tarciowego. Parametry zgrzewania dobierano wg kryterium najniższego stopnia rekrystalizacji obszaru złącza. Wykonano badania metalograficzne, scharakteryzowano wybrane obszary złącza zgrzewanego pod względem twardości i zasięgu zmiękczenia materiału. Wykonano próby statycznego rozciągania, porównano wytrzymałość na rozciąganie materiału rodzimego oraz złącza zgrzewanego.

EN

The article discusses the issues of weldability of metals with UFG (ultrafine grained) metals. The problem was discussed on the example of 316L steel with UFG structure obtained by metal forming method of hydrostatic extrusion. The joints were obtained by friction welding. Welding parameters were selected according to the criterion of the lowest degree of recrystallization of the joint area. Metallographic examinations were performed, selected areas of the joint welded in terms of hardness and range of softening of the material. Static tensile tests were carried out, the tensile strength of the parent material and the welded joint were compared.

11

Wpływ parametrów trymowania (usuwania wypływki) na wybrane właściwości złączy zgrzewanych tarciowo

Toporowski K., Piwowarczyk T., Ambroziak A.

Przegląd Spawalnictwa

|

2018

|

R. 90, nr 8

47--53

PL

W artykule opisano aspekty praktyczne zgrzewania tarciowego, ze szczególnym zwróceniem uwagi na proces trymowania – obróbki ubytkowej wypływki bezpośrednio po zgrzewaniu. Na przykładach produkcyjnych wytłumaczono cel trymowania i zaprezentowano jego alternatywy. Analizowano wpływ wybranych parametrów obróbki (prędkość obrotowa, posuw oraz czas) na wybrane właściwości zgrzein tarciowych. Próbki wykonane przy zmiennych parametrach trymowania poddano badaniom wizualnym, analizie metalograficznej (makro- i mikrostruktura) oraz pomiarom twardości. Dodatkowo dla skrajnych wyników przeprowadzono analizę z wykorzystaniem kamery termowizyjnej. Na podstawie przeprowadzonych badań i testów określono wpływ parametrów obróbki na jakość zgrzein tarciowych.

EN

The practical aspects of friction welding were described in this paper including especially flash removal process occuring directly after welding. To explain the purpose of those processes the production examples and thier alternatives have been shown. The analysis has been prepared based on studies by adjusting siqnificant process parameters (rotation speed, feedrate, time) on indicated welds properties. Samples made with variable flash removal parameters were subjected to visual tests, metallographic analysis (macro- and microstructure) and hardness measurements. Additionally a thermal analysis has been prepared for extreme results. Based on described research, the influence of process parameters on the friction welds quality was determined.

12

Characteristics of Fusion Welded and Friction Welded Joints Made in High-Carbon Nanobainitic Steels

Węglowski M. S., Grobosz W., Marcisz J., Garbarz B.

Biuletyn Instytutu Spawalnictwa w Gliwicach

|

2018

|

Vol. 62, No. 4

7--15

EN

Intense research on the metallurgy of iron alloys have recently resulted in the development of technologies enabling the making of high-carbon nanobainitic steels. Because of their chemical composition, the above-named steels belong to hard-to-weld materials. To identify the possibility of welding such steels using arc-based methods and welding in the solid state it was necessary to make test joints and perform related metallographic tests. The test results revealed that it is possible to obtain both fusion and pressure welded joints if the process was performed in the softened state, i.e. before the final heat treatment. Afterwards, joints should be subjected to a heat treatment ensuring the obtainment of a previously assumed microstructure and required hardness distribution in the weld and HAZ.

PL

Intensywne prace badawczo-rozwojowe w zakresie metalurgii stopów żelaza doprowadziły w ostatnim czasie do opracowania technologii wytwarzania wysokowęglowych stali nanobanitycznych. Stale te ze względu na skład chemiczny należą do materiałów trudno spawalnych. W celu określenia możliwości ich spawania metodami łukowymi oraz zgrzewania w stanie stałym, wykonano złącza próbne oraz przeprowadzono badania metalograficzne w ich obszarze. Wyniki badań wykazały możliwość uzyskania złączy spawanych i zgrzewanych pod warunkiem prowadzenia procesów łączenia blach w stanie zmiękczonym, tj. przed finalną obróbką cieplną. Następnie złącza można poddać obróbce cieplnej gwarantującej uzyskanie założonej mikrostruktury i rozkładu twardości w spoinie i w strefie wpływu ciepła.

13

Influence of welding time on quality of the friction welded joint of two dissimilar steels

Ratković N., Lazić V., Arsić D., Nikolić R., Hadzima B.

Zeszyty Naukowe. Quality. Production. Improvement

|

2017

|

No. 1 (6)

1--11

EN

There are several factors that influence the friction welding (FW) process, i.e. the quality of the welded joint, like the welding time, the contact pressure, the compacting pressure, the friction speed etc. The joining process is additionally complicated if the two different materials are to be welded to each other. The subject of research, presented in this paper, is the welding time of the FW process, since the level of axial and radial plastic deformation of the welded pieces and shortening of the welded part depend mainly on the welding time. The paper first presents some theoretical basics of the FW process and then, in the experimental part, the influence of the process duration is investigated. The two materials that the experimental samples were made of are the high-speed steel and the steel for tempering.

14

Wysokowydajne zgrzewanie FSW stopu aluminium przerabianego plastycznie

Miara D., Matusiak J.

Przegląd Spawalnictwa

|

2017

|

R. 89, nr 10

27--31

PL

Proces zgrzewania FSW jest stosunkowo prosty do realizacji w przypadku łączenia elementów wykonanych z takich samych materiałów lub materiałów nieznacznie różniących się własnościami fizycznymi. Zasadniczo, do tego rodzaju konstrukcji wykorzystuje się niewielkie prędkości zgrzewania. W artykule przedstawiono wyniki badań dotyczące wysokowydajnego zgrzewania metodą FSW stopu aluminium przerabianego plastycznie. Uzyskane rezultaty wskazują, że otrzymane połączenia cechują się wysoką jakością i pozbawione są wad oraz niezgodności.

EN

FSW process is relatively simple for realization in case of welding of similar materials or materials which slightly differ in their physical properties. Principally, for these types of application, low welding speeds are used. The article presents research results connected with high speed FSW welding of wrought aluminium alloy. Obtained results show that welds are characterized by high quality without any defects or imperfections.

15

Numerical study of the mechanical behavior and fatigue in a weld bead by friction stir for a 6082-T6 aluminum alloy

Kambouz Y., Benguediab M., Bouchouicha B.

Mechanics and Mechanical Engineering

|

2017

|

Vol. 21, nr 1

67--83

EN

The process of friction stir welding is a significant advance in the field of research on the Friction welding technique known for several decades. This assembly technique has obvious originality since welding is performed in the solid state, which can help eliminate birth defects related to solidification phase compared to conventional welding. The numerical modeling of this type of process is complex, not only in terms of the variety of physical phenomena which must be considered, but also because of the experimental procedure that must be followed in order to verify and validate numerical predictions. In this work, a finite element model is proposed in order to simulate the crack propagation under monotonic loading in different areas of the weld seam of a specimen CT-50 aluminum alloy 6082-T6. Microhardness tests were performed to characterize the Vickers hardness profile in the vicinity of the weld area. Friction stir welding process leads to a decrease of the static mechanical properties relatively to base material. Detailed examination revealed a hardness decrease in the thermo mechanically affected zone and the nugget zone average hardness was found to be significantly lower than the base alloy hardness. Welded specimens show significantly lower lives than base material.

16

Badania eksperymentalne tarciowego zgrzewania wolframowego stopu ciężkiego ze stopem aluminium wraz z modelowaniem rozkładu temperatury

Goroch O., Zimmerman J.

Inżynieria Powierzchni

|

2017

|

nr 3

3--9

PL

Praca dotyczy obrotowego tarciowego zgrzewania wolframowego stopu ciężkiego ze stopem aluminium, które zostało przeprowadzone dla wytypowanych kombinacji parametrów procesu zgrzewania. Badania zostały uzupełnione o symulację rozkładu temperatury na powierzchni próbki wykonaną metodą elementów skończonych w programie ADINA.

EN

The work concerns the rotary friction welding of tungsten heavy alloy with aluminum alloy, which has been carried out for the selected combinations of welding process parameters. The study was supplemented with a simulation of the temperature distribution on the surface of the sample made by means of the finite element method in ADINA program.

17

Rotary friction welding of weight heavy alloy with wrought AlMg3 alloy for subcaliber ammunition

Goroch O., Gulbinowicz Z.

Advances in Science and Technology. Research Journal

|

2017

|

Vol. 11, no 4

111--122

EN

The results of studies concerning friction welding of Weight Heavy Alloy (WHA) with AlMg3 alloy are presented. The friction welding of density 17.5 Mg/m3 with aluminum alloy showed that it is possible to reach the joints with the strength exceeding the yield strength of wrought AlMg3 alloy. This strength looks to be promising from point of view of condition which have to be fulfilled in case of armor subcaliber ammunition, where WHA rods play the role Kinetic Energy Penetrators and aluminum is used for projectile ballistic cup.

18

Morfologia złączy kompozytów Al/Al2O3 zgrzewanych tarciowo ze stopem Al 44200

Siedlec R., Strąk C., Zybała R.

Przegląd Spawalnictwa

|

2016

|

R. 88, nr 11

9--13

PL

W pracy przedstawiono wyniki spajania stopu EN-AC-44200 z materiałami kompozytowymi Al/Al2O3 z wykorzystaniem techniki zgrzewania tarciowego. Zastosowane materiały kompozytowe wytwarzano techniką ciśnieniowej infiltracji SC (ang. squeeze casting) oraz metodą iskrowego spiekania plazmowego SPS (ang. Spark Plasma Sintering). Zawierały one 20 oraz 30% objętościowego udziału fazy wzmacniającej – tlenku glinu, w różnej postaci. W przypadku kompozytów SC wzmocnienie stanowiły cząstki Al2O3 (α-form) o wielkości 3-6 μm, zaś dla kompozytów SPS był to elektrokorund gruboziarnisty o uziarnieniu 180 μm. W pracy przedstawiono optymalne parametry procesu zgrzewania tarciowego dla poszczególnych materiałów kompozytowych, opracowane przez autorów na podstawie analizy zmian mikrostruktury i twardości materiałów w obszarze spajania. Przeprowadzone badania miały na celu ocenę morfologii oraz jakości połączenia pomiędzy stopem 44200 a kompozytami Al/Al2O3 w zależności od rodzaju wzmocnienia oraz techniki wytwarzania kompozytów Al/Al2O3

EN

The paper presents results of bonding EN AC-44200 alloy with a different composite materials by friction welding technique. Materials used in the study, were processed using two techniques: squeeze casting (SC) and spark plasma sintering (SPS). It contained a 20% and 30% volume reinforced fraction of different forms of Al2O3. This paper presents the developed friction welding conditions of two different composite materials, and the analysis of microstructure and microhardness for obtained joints. All of studies were performed to determine the morphology and the quality of the connection between the 44200 alloy and Al/Al2O3 composites.

19

Influence of Friction Stir Welding (FSW) on mechanical and corrosion properties of AW-7020M and AW-7020 alloys

Dudzik K., Jurczak W.

Polish Maritime Research

|

2016

|

nr 3

86--90

EN

Friction welding associated with mixing the weld material (FSW - Friction Stir Welding ) is an alternative to MIG and TIG welding techniques for Al-alloys. This paper presents experimental results obtained from static tension tests on specimens made of AW-7020M and AW-7020 alloys and their joints welded by using FSW method carried out on flat specimens, according to Polish standards : PN-EN ISO 4136:2011 and PN-EN ISO 6892-1:2010. Results of corrosion resistance tests are also presented. The tests were performed by using the electrochemical impedance spectroscopy (EIS). EIS measurement was conducted with the use of three-electrode system in a substitute sea water environment (3,5% NaCl - water solution). The impedance tests were carried out under corrosion potential. Voltage signal amplitude was equal to 10mV, and its frequency range - 100 kHz ÷ 0,1 Hz. Atlas 0531 EU&IA potentiostat was used for the tests. For the tested object an equivalent model was selected in the form of a substitute electric circuit. Results of the impedance spectroscopy tests are presented in the form of parameters which characterize corrosion process, as well as on Nyquist’s graphs together with the best-fit theoretical curve. Analysis of the test results showed that the value of charge transfer resistance through double layer , Rct , for the FSW- welded specimen , was lower than that for the basic material, and that much greater difference was found in the case of AW-7020M alloy. The impedance spectroscopy tests showed that both the FSW-welded joints and basic material of AW-7020M and AW-7020 alloys were characterized by a good resistance against electrochemical corrosion in sea water environment , and that FSW –welded joints revealed a greater corrosion rate. The performed tests and subject-matter literature research indicate that application of FSW method to joining Al-alloys in shipbuilding is rational.

20

Numerical analysis of friction welded titanium joints

Shenbaga Velu P., Rajesh Jesudoss Hynes N.

Journal of Achievements in Materials and Manufacturing Engineering

|

2016

|

Vol. 76, nr 1

26--29

EN

Purpose: Friction welding is found to be a suitable candidate for joining the dissimilar materials. Numerical model would be helpful for proper selection of processing conditions. In the present work, a thermo-mechanical model has been developed using finite element method based software. Design/methodology/approach: Friction welding process is characterized of thermomechanical phenomenon, which is highly complex in nature. Thermo-mechanical model is considered as highly nonlinear due to the interaction between the temperature fields and time dependent on the material properties. The numerical model is subject to certain assumptions and boundary conditions. Findings: The numerical investigation was carried out to predict the temperature distribution, heat flux, the axial shortening and stress on the friction welded titanium joints. Research limitations/implications: Leading aerospace manufacturers are exploring the joining of titanium to titanium for aerospace applications. The approach is time saving and it is supposed to have a promising future in automotive and nuclear fields.