Periodical plastic flow pattern in friction stir processed Al–Mg alloy

Cui, Guorong; Ma, Z.Y.; Li, S.X.

doi:10.1016/j.scriptamat.2008.02.003

Cited by 81 publications

(36 citation statements)

References 6 publications

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“…Concerning this third lenght, it was found constant for a given joint and equal to the pitch. These results is commonly found in literature (Colligan, 1999;Krishnan, 2002;Gratecap, 2007;Cui et al, 2008;Xu and Deng, 2008). The tool marks are often attributed to the threads of pins.…”

Section: Results In Transverse Directionsupporting

confidence: 75%

Understanding the material flow path of friction stir welding process using unthreaded tools

Lorrain

Favier

Zahrouni

et al. 2010

Journal of Materials Processing Technology

173

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a b s t r a c tMaterial flow during friction stir welding is very complex and not fully understood. Most of studies in literature used threaded pins since most industrial applications currently use threaded pins. However, initially threaded tools may become unthreaded because of the tool wear when used for high melting point alloys or reinforced aluminium alloys. In this study, FSW experiments were performed using two different pin profiles. Both pins are unthreaded but have or do not have flat faces. The primary goal is to analyse the flow when unthreaded pins are used to weld thin plates. Cross-sections and longitudinal sections of welds were observed with and without the use of material marker (MM) to investigate the material flow. Material flow with unthreaded pin was found to have the same features as material flow using classical threaded pins: material is deposited in the advancing side (AS) in the upper part of the weld and in the retreating side (RS) in the lower part of the weld; a rotating layer appears around the tool. However, the analysis revealed a too low vertical motion towards the bottom of the weld, attributed to the lack of threads. The product of the plunge force and the rotational speed was found to affect the size of the shoulder dominated zone. This effect is reduced using the cylindrical tapered pin with flats.

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Section: Results In Transverse Directionsupporting

confidence: 75%

Understanding the material flow path of friction stir welding process using unthreaded tools

Lorrain

Favier

Zahrouni

et al. 2010

Journal of Materials Processing Technology

173

View full text Add to dashboard Cite

show abstract

“…6f. The distinctive appearance of the AS and RS interface was explained by the deposition of material layers behind the tool as a function of traverse per revolution [15][16][17][18][19][20]. In the first half of the revolution of the tool the material transmits from AS and accumulates at RS.…”

Section: Optical Microstructurementioning

confidence: 99%

Microstructure examination and microhardness of friction stir welded joint of (AA7020-O) after PWHT

et al. 2018

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This paper studies the microstructure and microhardness of the welded joints of the annealed aluminum alloy AA7020-O produced by friction stir welding (FSW) technique. The material was applied to post weld heat treatment (solution treatment and artificially aged, T6). The traverse speed and the rotational speed are the most important process parameters of FSW, and have great influence on the heat input of the welding operation which governs the welded joints quality. To investigate their effect, the welding operation was performed using three traverse speeds, 20, 40 and 60 mm/s with two rotational speeds of 1125 and 1400 rpm, and other welding parameters were kept constant to produce comparable joints. It was found that the two rotational speeds are accepted with lower traverse speeds to produce sound joints. Microstructure of the welded joints was significantly affected by the FSW process parameters, and slight effect was reported for the grain size. Microhardness examination showed high weld joint quality with respect to the base metal hardness, which proves the reprecipitation of the hardening phase in the weld zone. The microhardness profile was strongly dependant on the rotational speed, and the average values of the joints hardness have increased with the decrease in the rotational speed, where it have been slightly affected by the welding speed. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of Housing and Building National Research Center. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

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“…In the last years, several investigations have been presented in the literature on some fundamentals of FSP and its process mechanics: for instance the microstructural evaluation occurring in the material [1,4], physical concept of process [5,6], and the occurring material flow [7,8]. A wide research activity has been also focused on mechanical properties of the modified material [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Response Surface Methodology for Investigation of FSP Process

Węglowski¹

2014

Archive of Mechanical Engineering

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The article presents the effect of rotational and travelling speed and down force on the spindle torque acting on the tool in Friction Stir Processing (FSP) process. The response surface methodology (RSM) was applied to find a dependence combining the spindle torque acting on the tool with the rotational speed, travelling speed and the down force. The linear and quadratic models with interaction between parameters were used. A better fitting was achieved for a quadratic model. The studies have shown that the increase in rotational speed causes a decrease in the torque while the increase in travelling speed and down force causes an increase in the torque. The tests were conducted on casting aluminium alloy AlSi9Mg. Metallography examination has revealed that the application of FSP process results in a decrease in the porosity in the modified material and microstructure refining in the stir zone. The segregation of Si and Fe elements was evident in the parent material, while in the friction stir processed area this distribution was significantly uniform.

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Periodical plastic flow pattern in friction stir processed Al–Mg alloy

Cited by 81 publications

References 6 publications

Understanding the material flow path of friction stir welding process using unthreaded tools

Understanding the material flow path of friction stir welding process using unthreaded tools

Microstructure examination and microhardness of friction stir welded joint of (AA7020-O) after PWHT

Experimental Study and Response Surface Methodology for Investigation of FSP Process

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