Welding of Aluminum to DP600 Steel Plates by Refill Friction Stir Spot Welding Process (Refill FSSW): Preliminary Results

Verástegui, Roger Navarro; Mazzaferro, José Antônio Esmerio; Mazzaferro, Cíntia Cristiane Petry; Strohaecker, Telmo Roberto; Santos, Jorge F. dos

doi:10.4028/www.scientific.net/amr.1082.123

Cited by 9 publications

(7 citation statements)

References 19 publications

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“…In contrast volumetric defects have little influence on the shear strength of the joints. Verastegui et al [17] applied the Taguchi statistical method to find out the set of parameters indicated to produce a joint with higher strength. He found that the galvanised layers of sheet to be joined do not cause any substantial effect on joint strength.…”

Section: Introductionmentioning

confidence: 99%

Polyoptimisation of the refill friction stir spot welding parameters applied in joining 7075-T6 Alclad aluminium alloy sheets used in aircraft components

Kluz

Kubit

Trzepieciński

et al. 2019

Int J Adv Manuf Technol

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In the aerospace industry, the refill friction stir spot welding (RFSSW) method is increasingly used to join thin sheets, especially those made of 2xxx and 7xxx series aluminium alloys. This paper presents the results of spot welding lap joints of 7075-T6 aluminium alloy sheets. The load capacity of joints was determined by tensile/shear tests using a universal testing machine. The effect of tool plunge depth, tool rotational speed and duration of welding on joint load capacity and failure mode was investigated. The polyoptimisation of the values of welding process parameters was carried out to ensure the highest load capacity of the joint at a minimum variance of the results obtained. The selection of the optimal parameters of the RFSSW process was carried out using an adequate mathematical model obtained on the basis of Weierstrass' theorem. It was found that tool rotational speed had the greatest impact on the load capacity of the joints. It was possible to increase the load capacity of the joint by increasing the duration of welding but only to a limited extent. The selection of optimal welding parameters requires a compromise solution, i.e. the selection of a tool rotational speed that ensured adequate plasticisation of the material with a welding duration that ensured that an appropriate joint microstructure was obtained and assured the required load capacity of the joint. The methodology of mathematical modelling of polyoptimisation presented can be useful in optimising similar joining processes.

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Section: Introductionmentioning

confidence: 99%

Polyoptimisation of the refill friction stir spot welding parameters applied in joining 7075-T6 Alclad aluminium alloy sheets used in aircraft components

Kluz

Kubit

Trzepieciński

et al. 2019

Int J Adv Manuf Technol

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show abstract

“…Numerous researchers have used OFAT to select the ranges of process parameters for the main experiments. 14,15 Effertz et al. 14 employed the OFAT approach to examine the sensitivity of the friction spot welding process for a single change in the process and then applied the Taguchi method to the main experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Verastegui et al. 15 employed the OFAT approach for the friction stir spot welding process to obtain the optimum values of rotational speed, welding time, and tool penetration depth. This approach is time-consuming and increases the number of experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous researchers have used OFAT to select the ranges of process parameters for the main experiments. 14,15 Effertz et al 14 employed the OFAT approach to examine the sensitivity of the friction spot welding process for a single change in the process and then applied the Taguchi method to the main experiments. Verastegui et al 15 employed the OFAT approach for the friction stir spot welding process to obtain the optimum values of rotational speed, welding time, and tool penetration depth.…”

Section: Introductionmentioning

confidence: 99%

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Procedure to find out the optimal ranges of process parameters for friction stir welding

Verma

Misra

Gupta

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present study deals with the application of sequential procedure (i.e. steepest ascent) to obtain the optimum values of process parameters for conducting friction stir welding (FSW) experiments. A vertical milling machine is modified by fabricating fixture and tool ( H13 material) for performing FSW operation to join AA7039 plates. The steepest ascent technique is employed to design the experiments at different rotational speed, welding speed, and tilt angle. The ultimate tensile strength is considered as a performance characteristic for deciding the optimal levels. The mechanical and metallurgical characteristics of the joints are studied by executing tensile and microhardness tests. It is concluded from the graphical analysis of the steepest ascent technique that the optimal maximum and minimum values are 1812–1325 r/min for rotational speed, 43–26 mm/min for welding speed, and 2°–1.3° for tilt angle, respectively. Besides, optical microscope and scanning electron microscope are utilized for microstructural and fractographic analyses for a better understanding of the process.

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“…The influence of the welding process parameters on the load capacity of joints and the weld microstructure has become the focus of much research investigation (Ref [5][6][7]. Oberembdt et al (Ref 5) concluded that the most effective variable for controlling joint strength is plunge depth.…”

Section: Introductionmentioning

confidence: 99%

A Weighting Grade-Based Optimization Method for Determining Refill Friction Stir Spot Welding Process Parameters

Kluz

Trzepieciński

Faes

et al. 2019

J. of Materi Eng and Perform

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The welding process used in fabricating thin-walled structures by refill friction stir spot welding (RFSSW) should be characterized by a high strength of welds and high process repeatability which is demonstrated by a small dispersion of the load capacity of the joints. The present work is designed to optimize RFSSW process parameters for 7075-T6 Alclad aluminum alloy sheets used to fabricate aircraft structures. The optimization was performed by scalarization of the objective function using the weighting grades method. The study considers the effect of process parameters, i.e., tool plunge depth, duration of welding, tool rotational speed, on the tensile/shear strength of the joints, and dispersion of the load capacity. It was found that it was possible to choose the optimal welding parameters taking into account maximization of the load capacity and minimization of the dispersion of the joint strength via a best compromise between the tool rotational speed ensuring adequate plasticization of the base material and the duration of welding ensuring that a fine-grained joint microstructure is obtained.

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Welding of Aluminum to DP600 Steel Plates by Refill Friction Stir Spot Welding Process (Refill FSSW): Preliminary Results

Cited by 9 publications

References 19 publications

Polyoptimisation of the refill friction stir spot welding parameters applied in joining 7075-T6 Alclad aluminium alloy sheets used in aircraft components

Polyoptimisation of the refill friction stir spot welding parameters applied in joining 7075-T6 Alclad aluminium alloy sheets used in aircraft components

Procedure to find out the optimal ranges of process parameters for friction stir welding

A Weighting Grade-Based Optimization Method for Determining Refill Friction Stir Spot Welding Process Parameters

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