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Experimental Analysis of the Post-Buckling Behaviour of Compressed Stiffened Panel with Refill Friction Stir Spot Welded and Riveted Stringers

Kubit Andrzej, Święch Łukasz, Trzepiecinski Tomasz, Faes Koen

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 2

159--167

EN

The paper presents the results of research aimed at comparing two stringer joining technologies of stiffened panels. Experimental tests were carried out on the basis of uniaxial compression of thin-walled panels stiffened with two parallel stringers. The panels consist of a skin plate and stringers joined with two techniques: riveting and refill friction stir spot welding (RFSSW). The aim of the investigations was to determine the amount of the critical load, the character of the structure's work in the range of post-buckling behaviour and the mode of panel destruction. For deformation measurements, an optical scanner Aramis based on the digital image correlation (DIC) technique was used. The research conducted enabled the assessment of the effectiveness of the RFSSW technology of joining the semi-monocoque structures, taking into account the range of post-critical deformations caused both to the local and global loss of stability. The compression tests have shown that the plate with welded stringers with a spacing of 29.5 mm exhibits the ultimate load similar to the variant of the riveted panel. It was also observed that the nature and number of buckling half-waves depend on the applied load and spacing between connectors.

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The effect of RFSSW parameters on the load bearing capacity of aluminum 7075-T6 sheet metal joints

Kluz Rafał, Kubit Andrzej, Wydrzyński Dawid

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 2

35--41

EN

Friction Stir Spot Welding is one of the most contemporary methods of joining metals and alloys in their solid state. The ability to join elements made of aluminum alloys allows for utilizing this method in the manufacturing of aircraft structures while lowering the work load, costs, and weight, without sacrificing or even having better strength parameters than classic methods of joining elements. It ensures constant joint parameters, however it requires the use of optimal welding parameters such as: the rotational speed of the tool, tool delve depth, and welding time. The work presents the results of experiments conducted on 7074 aluminum sheet metal that was 1.8 and 0.8 mm thick, which conducted in accordance with the PS/DK32 research plan. The welding tests were done on a dedicated spot welding machine, while the strength tests consisted of static tensile strength tests. In the final part of the article contains an analysis and interpretation of the results.

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Zgrzewanie punktowe blach ze stopu aluminium 7075-T6

Kluz R., Kubit A., Wydrzyński D.

Technologia i Automatyzacja Montażu

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2017

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nr 2

56--60

PL

Punktowe zgrzewanie tarciowe z przemieszaniem jest jedną z najnowocześniejszych metod łączenia metali i ich stopów w stanie stałym. Możliwość łączenia elementów wykonanych ze stopów aluminium pozwala na stosowanie tej metody przy produkcji struktur lotniczych, przy jednoczesnym obniżeniu pracochłonności, kosztów i ich ciężaru, zachowując porównywalne lub wyższe parametry wytrzymałościowe w porównaniu do klasycznych metod łączenia elementów. Zapewnienie stałości parametrów użytkowych połączeń wymaga jednak doboru parametrów procesu zgrzewania, tj.: prędkości obrotowej narzędzia, zagłębienia narzędzia oraz czasu zgrzewania. W pracy zaprezentowano wyniki badań procesu zgrzewania blach aluminiowych 7075-T6 o grubości 1,8 i 0,8 mm. Testy zgrzewania przeprowadzono na dedykowanej maszynie do zgrzewania punktowego, natomiast badania wytrzymałościowe obejmowały statyczną próbę ścinania. W końcowej części artykułu dokonano analizy porównawczej nośności połączenia i budowy spoiny uzyskanej metodą RFSSW przy najkorzystniejszych parametrach ze zgrzeiną wykonaną metodą zgrzewania oporowego.

EN

Friction Stir Spot Welding is one of the most contemporary methods of joining metals and alloys in their solid state. The ability to join elements made of aluminum alloys allows for utilizing this method in the manufacturing of aircraft structures while lowering the work load, costs, and weight, without sacrificing or even having better strength parameters than classic methods of joining elements. It ensures constant joint parameters, however it requires the use of optimal welding parameters such as: the rotational speed of the tool, tool delve depth, and welding time. The work presents the results of experiments conducted on 7075-T6 aluminum sheet metal that was 1.8 and 0.8 mm thick. The welding tests were done on a dedicated spot welding machine, while the strength tests consisted of static tensile strength tests. In the final part of the article comparative analysis was made of strength of joint made by RFSSW method and obtained from the resistance welding.

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Selected Possibilities of the FSW and FSSW Methods in the Removal of Material Defects and Welding Imperfections

Kudła K., Wojsyk K.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2017

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Vol. 61, No. 5

111--115

EN

The article describes unconventional applications of friction stir welding (FSW; linear) and friction stir spot welding (FSSW) processes including the possibility of removing material defects and welding imperfections. The article presents results of tests involving aluminium alloys and demonstrates various repair methods in relation to types of material defects and welding imperfections.

PL

Praca obejmuje opis niekonwencjonalnych zastosowań zgrzewania tarciowego z przemieszaniem w wersji liniowej (FSW) i punktowej (FSSW). Opisano możliwości usuwania wad materiałowych i niezgodności spawalniczych za pomocą zgrzewania tarciowego. Przedstawiono wyniki prób przeprowadzonych na stopach aluminium. Zaprezentowano różne wersje metod naprawczych w zależności od rodzaju wady materiałowej lub niezgodności spawalniczej.

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Nowoczesne metody zgrzewania tarciowego punktowego materiałów konstrukcyjnych

Kustroń P., Leśniewski J., Białobrzeska B.

Przegląd Spawalnictwa

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2016

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R. 88, nr 8

43--46

PL

W artykule przedstawiono aktualnie najpopularniejsze metody zgrzewania tarciowego punktowego. Obecnie łączenie metali lekkich jak stopy aluminium czy magnezu stwarza szereg problemów natury technologicznej czy metalurgicznej. Osiągnięcie odpowiednich właściwości wytrzymałościowych produkowanych złączy wymaga niejednokrotnie urządzeń o relatywnie wysokiej mocy, dodatkowych zabiegów obróbki cieplnej czy odpowiedniego przygotowania elementów łączonych. Ciekawą i coraz szerzej stosowaną alternatywą dla procesów zgrzewania rezystancyjnego punktowej jest zgrzewanie tarciowe punktowe. Jest to nowatorska metoda łączenia, powstała ona na bazie znanego procesu FSW (Friction Stir Welding) tj. zgrzewania tarciowego liniowego z wymieszaniem materiałów łączonych. Metoda FSW została ona opracowana przez Brytyjski ośrodek TWI (The Welding Institute) w 1991r a następnie rozwijana przez szereg ośrodków w USA, Japonii i Europie [1].

EN

The article presents the currently most popular methods of friction spot welding. Currently, joining of lightweight metals like aluminium and magnesium alloys poses a number of technological or metallurgical problems. Achieving the appropriate strength properties produced joints often requires devices with relatively high power, additional heat treatment and adequate preparation of the workpieces. Friction stir spot welding is an interesting and widely used alternative processes for resistance spot welding. It is an innovative method of joining. It was founded on the basis of a well-known process of FSW (Friction Stir Welding). FSW method has been developed by the British Center TWI (The Welding Institute) in 1991 and then developed by a number of research centers in the US, Japan and Europe.

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Experimental studies on ultrasonically assisted friction stir spot welding of AA6061

Rostamiyan Y., Seidanloo A., Sohrabpoor H., Teimouri R.

Archives of Civil and Mechanical Engineering

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2015

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Vol. 15, no. 2

335--346

EN

The present study introduces a new combination of two separate welding processes, i.e. friction stir spot welding (FSSW) and ultrasonic welding (USW). Here, in order to improve the weld quality, the friction stir spot welding is assisted by ultrasonic vibration of tool. To systematically analyze effect of process factors such as US vibration, tool rotary speed, tool plunge depth and dwell time on lap shear force and hardness, a L18 orthogonal array from Taguchi design of experiments is developed. Effects of process factors on responses were studied along with their percentage of contribution which was determined through analysis of variances. Results indicated that US vibration is a significant factor having positive influence on lap shear force and hardness. Next to the vibration, tool rotary speed, dwell time and plunge depth are also the important factors which affects mechanical properties significantly. Optimization of process factors by grey relational analysis showed that applying US vibration and selections of 1200 RPM tool rotary speed, 6 mm plunge depth and 6 s dwell time causes the highest value of grey relational grade and guarantee maximum lap shear force as well as maximum hardness.