Refill friction stir spot welding of 5083-O aluminum alloy

Xu, Zhiwu; Li, Zhengwei; Ji, Shude; Zhang, Liguo

doi:10.1016/j.jmst.2017.02.011

Cited by 88 publications

(32 citation statements)

References 30 publications

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“…28 The quality of the weld is determined by several welding parameters, ie, plunge depth, rotational speed, plunge time, dwell time, and retraction time that can be varied over a wide range of values. The range of the welding parameters or their specific values provided by many authors 8,[10][11][12][13]17 can be linked only with a specific grade of material, coating type, and sheet thickness of the upper and lower sheets. Furthermore, the quality of the weld is very sensitive to the state of tool wear and coating used.…”

Section: Effect Of Welding Parameters On the Defectsmentioning

confidence: 99%

Analysis of the effect of structural defects on the fatigue strength of RFSSW joints using C‐scan scanning acoustic microscopy and SEM

Kubit

Trzepieciński

Faes

et al. 2019

Fatigue Fract Eng Mat Struct

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Solid‐state refill friction stir spot welding (RFSSW) technology offers significant benefits in the fabrication of aluminium structures in the transport and aerospace industries. In this paper, the joining of 1.6‐mm‐thick Alclad 7075‐T6 aluminium alloy sheets is investigated. High‐cycle fatigue strength tests of single‐lap welded joints were carried out on an Instron E10000 testing machine with a limited number of cycles equal to 2 × 106. The welding of overlap fatigue specimens was conducted using an RPS100 spot welder by Harms & Wende GmbH & Co KG. C‐mode scanning acoustic microscopy (C‐SAM) and scanning electron microscopy (SEM) were utilised to evaluate the joint quality and characterise the microstructure. The paper discusses the effect of the maximum load force and defects (voids, hook, kissing bond, bonding ligament, etc) associated with the material flow in the weld on the failure mechanism. Insufficient plasticisation of sheet material and mixing of the material in the weld area are crucial defects that influence the number of destructive cycles. The weld defects in the joint structure are a source of a decrease in the fatigue life compared with the fatigue life of defect‐free welds. It was also found that RFSSW joint defects can be effectively detected by the nondestructive C‐SAM method.

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Section: Effect Of Welding Parameters On the Defectsmentioning

confidence: 99%

Analysis of the effect of structural defects on the fatigue strength of RFSSW joints using C‐scan scanning acoustic microscopy and SEM

Kubit

Trzepieciński

Faes

et al. 2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The working range of each process parameter was first estimated with reference to previous studies [9,10,12,20,22,23]. The lower limits of N and T were thus determined, and several trial weld runs were performed to further determine the upper limit of N by varying its value while keeping the remaining values constant.…”

Section: Experimental Designmentioning

confidence: 99%

“…In terms of FSSW process, the evolution of the microstructure and the resultant degree of bonding depend on the thermal generation at contact interface and the superplastic flow of welded materials, and are further determined by significant parameters such as tool geometry, rotational speed, plunged depth by shoulder and dwell time [9][10][11]. Under the premise that other factors are unchanged, it can be considered that the selected depth directly determines the level of axial welding force, which is thus expressed by the former.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Friction Stir Spot-Welded Parameters on Aluminum Alloy Sheets Based on Automotive Joint Loads

Zhang

Chen

Pan

et al. 2019

Metals

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By controlling various friction stir spot-welded (FSSW) factors, two base sheets AA 5052-H32 and 6061-T6 were selected to bond similar and dissimilar metal joints while considering dissimilar configuration orders. The effects of weld parameters on the sheer strength and peel strength were separately developed into empirical models utilizing the integrated central composite matrix design and response surface methodology (RSM). Meanwhile, the finite element (FE) analysis of the multi-axis load-bearing characteristics for automotive solder joints during service was carried out. As a result, the weights of the shear and axial stress, accounting for 90.5% and 9.5% respectively, were employed to restrict the relationship between multiple target properties, and the resulting security strength was applied to determine the feasible domain in subsequent parametric optimization. In order to enable the optimal multi-axis capacities in accordance with the load mode, the genetic algorithm NSGA-II was chosen to compute the Pareto front and further determine the best compromise solutions. The obtained optimums corresponding to each joining condition were validated by confirmation runs, indicating that this coupled multi-objective optimization approach based on working conditions was beneficial to the targeted improvement of post-weld mechanical properties.

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“…Welding is carried out by using a special tool built from three elements: a spindle, an inner sleeve, and a clamp. The principle of operation and the mechanism of weld formation are described in detail in many scientific papers, e.g., [11][12][13]. The basic advantages of this technology include good surface quality of welds, small deformations of joined elements, low material losses, low energy consumption, no emission of pollutants, as well as ease of automation, and above all, no need for special preparation of joined parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of Corrosion Protection Method on Properties of RSW and RFSSW Lap Joints Applied in Production of Thin-Walled Aerostructures

et al. 2020

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Aluminum structures, and in particular an element of aerostructures, are strongly exposed to the effects of weather conditions. In the case of using new techniques of joining these structural elements, the selection of proper corrosion protection without losing the required properties of the joint may determine its potential application. This paper presents the results of experimental research concerning the influence of corrosion protection on the microstructure and mechanical strength of resistance spot welded (RSW) and refill friction stir spot welded (RFSSW) joints. The tests were carried out on 2024 T3 aluminum alloy, both sides alcladed. For comparison purposes, the following joints were welded: without any protection, with the primer layer, with anodic oxide coating, and with anodic oxide coating plus sealant between the overlapping surface of the welded metal sheet. The samples were visually inspected, and metallographic and mechanical strength examination was conducted. The test results indicate that the application of the protective layers and its type have an impact on the strength of RSW and RFSSW joints. The use of an adhesive or sealant in welded joints provides an increase in the load capacity of the joint.

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Refill friction stir spot welding of 5083-O aluminum alloy

Cited by 88 publications

References 30 publications

Analysis of the effect of structural defects on the fatigue strength of RFSSW joints using C‐scan scanning acoustic microscopy and SEM

Analysis of the effect of structural defects on the fatigue strength of RFSSW joints using C‐scan scanning acoustic microscopy and SEM

Multi-Objective Optimization of Friction Stir Spot-Welded Parameters on Aluminum Alloy Sheets Based on Automotive Joint Loads

Effect of Corrosion Protection Method on Properties of RSW and RFSSW Lap Joints Applied in Production of Thin-Walled Aerostructures

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