Residual stress evaluation in friction stir welding of aluminum plates by means of acoustic emission and ultrasonic waves

Sadeghi, Seyedali; Karimi, Nader; Fotouhi, Mohamad; Hasani, M.; Najafabadi, Mehdi Ahmadi; Pavlović, Ana

doi:10.5937/fmet1802230s

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…It is understood that increase in Y value results increase in welding speed which reduces the size of the heat affected zone in which failure happens in FSW joints, because of less existence of needle shaped precipitate. High intensity heat supply not only reduces heat affected zone but also reduces the temperature gradient on the nearby zone around the vertical tool probe [25] ( fig. 5).…”

Section: Resultsmentioning

confidence: 99%

Transient heat input model for friction stir welding using non-circular tool pin

León¹,

Jayakumar²

2020

FME Transactions

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Frictional heat source in the contact surface of a rotating tool and a stationary workpiece is used to join metal pieces along the weldline in the friction stir welding process. Temperature profile developed during welding decides the post weld properties on the joined workpieces not only along the weld line but also in the nearby layers of heat affected zone. As the heat input depends on the contact surface geometry in the tool/matrix interface, tool shape has a higher influence on peak temperature developed during the process and on the other hand it influences the post weld properties also. In this paper, a simplified analytical heat input model has been derived and validated for noncircular pin profile by introducing a new multiplication factor in the circular pin profile heat input model. Transient thermal numerical models are developed for, triangular, square and pentagonal pin profiles using analytical heat input results to analyse the change in temperature profiles with respect to the change in tool pin geometry. Furthermore, a detailed analysis is made to understand the percentage contribution of tool pin on the total heat supply.

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Section: Resultsmentioning

confidence: 99%

Transient heat input model for friction stir welding using non-circular tool pin

León¹,

Jayakumar²

2020

FME Transactions

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“…FSW produces a joint of improved properties and performance, lower distortion in the welded part when compared to the conventional welding processes [1]. Exhaustive studies have been carried out on FSW of lightweight materials especially aluminium alloys [1][2][3][4][5][6][7][8][9] and magnesium alloys [10,11]. Very limited work has been carried out to investigate the FSW of steel [12], Zinc [13], Copper [14], Titanium [15] etc.…”

Section: Introductionmentioning

confidence: 99%

“…Campanile et al [2] have shown that the highest values of UTS and yield strength are attained with high weld pitch and plunging depth. Sadeghi et al [4] have used non destructive methods, Acoustic emission (AE) and Ultrasonic waves, for evaluating the residual stresses formed during FSW. Guoqing Wang et al [5] have stated that the traditional non-destructive methods may not reveal the defects properly in FSW and so performed phased array ultrasonic testing (PUAT) to effectively identify the weld defects.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tool Rotational Speed on the Tensile and Microstructural Properties of Friction Stir Welded Different Grades of Stainless Steel Joints

Ethiraj

Sivabalan

Beena

et al. 2020

IJE

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Friction stir welding is a relatively new solid state joining process, which is suitable for welding similar and dissimilar materials. The present research work concentrates on the effect of tool rotational speed on the tensile, microstructural properties and microhardness of the friction stir welded joints of different grades of austenitic stainless steel sheets. Four different tool rotational speeds are used in the experimentation while the other process parameters like traversing speed and the tool tilt angle are kept constant. The tensile testing, micrography and microhardness measurements were carried out in the welded samples. It is observed from the results of tensile testing that the joint made at the tool rotational speed of 1320 rpm has the maximum strength among the experimented speeds. The measured microhardness values at heat affected zone and parent metal zone have shown higher hardness than the weld zone. Fine and equi-axed grains are observed in the welded region at all experimented speeds with a negligible amount of transformation of austenite into martensite. These results have impact on the development of welding procedure for dissimilar stainless steel friction stir welding process.

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“…For these reasons, it is highly desirable to know the magnitude of residual stresses and distortions in the structure as early as the design phase. Due to the rapid progress of computer technology in recent decades, the numerical calculations of residual stresses and distortions have become an unavoidable tool for predicting these phenomena by shifting expensive experiments to computationally based procedures [5][6][7][8][9]. The main problem that exists here is the long-time duration of numerical simulations in models with a large number of finite elements.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of residual stresses in a T-joint fillet weld using a submodeling technique

Perić¹,

Tonković²,

Maksimović³

et al. 2019

FME Transactions

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A submodeling technique is applied in the framework of this study on a Tjoint fillet weld example in order to check finite element mesh sensitivity as well as to obtain more accurate temperatures, displacements and residual stress fields in the weld and its vicinity where the temperature and stress gradients are very high. The submodeling procedure of the welding process is demonstrated step-by-step. The obtained results of the temperature, residual stress and displacement distributions correspond very well with the experimental measurements and analytical solutions from the literature.

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Residual stress evaluation in friction stir welding of aluminum plates by means of acoustic emission and ultrasonic waves

Cited by 9 publications

References 35 publications

Transient heat input model for friction stir welding using non-circular tool pin

Transient heat input model for friction stir welding using non-circular tool pin

Effect of Tool Rotational Speed on the Tensile and Microstructural Properties of Friction Stir Welded Different Grades of Stainless Steel Joints

Numerical analysis of residual stresses in a T-joint fillet weld using a submodeling technique

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