Friction Stir Welding of very thin plates

Galvão, Ivan; Leitão, C.; Loureiro, A.; Rodrigues, D.M.

doi:10.1590/s0104-92242012000100002

Cited by 20 publications

(7 citation statements)

References 23 publications

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“…However, the tensile specimen fractured at the nugget zone (NZ) due to the irregular thickness rather than the existence of defects. Galvao et al [30] performed µ-FSW of 1 mm-thick sheets of aluminum, copper, copper-zinc, and zinc alloys, and found that the increase in welding speed enhanced process productivity and raised the degree of grain refinement, improving mechanical properties. Panchal, M. et al [31] successfully connected ultrathin (0.5 mm-thick) commercial Al using µ-FSW technology.…”

Section: Introductionmentioning

confidence: 99%

Effect of High Rotational-Speed Friction-Stir Welding on Microstructure and Properties of Welded Joints of 6061-T6 Al Alloy Ultrathin Plate

et al. 2021

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The butt joint of an Al alloy ultrathin plate with a thickness of 0.5 mm is realized by a high rotational-speed friction-stir welding process. It overcomes the welding difficulty that the ultrathin plate is often torn, and it cannot be formed by conventional friction-stir welding. The results show that the weld surface is well-formed at a high-rotational speed (more than 8000 rpm), and there are no obvious defects in each area of the joint section. The nugget zone (NZ) is a recovery recrystallization structure dominated by large-angle grain boundaries, with a grain size of about 4.9 μm. During grain growth, the texture is randomly and uniformly distributed, and the strength is balanced. The microhardness of the NZ increases significantly with the increase in rotational speed, and the fluctuation range of hardness value is small. The NZ β–Mg2Si is finer and significantly less than the base metal (BM). The heat dissipation of the thin plate is fast, so a Cu plate is used as the backing plate to slow down the steep temperature-drop process in the weld area. Compared with a low rotational speed, the precipitation amount of brittle phase Al–Cu–Mg–Cr and Al–Fe–Si–Mn is significantly reduced, which is conducive to improving the mechanical properties of the joint. At a high rotational speed, 12,000 rpm, the best tensile strength of the joint is 220 MPa, which is about 76% of the BM (290 MPa), and the highest elongation is 9.3%, which is about 77.5% of the BM (12%). The fracture mode of the joint is a typical plastic fracture.

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Section: Introductionmentioning

confidence: 99%

Effect of High Rotational-Speed Friction-Stir Welding on Microstructure and Properties of Welded Joints of 6061-T6 Al Alloy Ultrathin Plate

et al. 2021

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“…As a result of the process characteristics and mode of heat generation, welds are composed of two main areas which are referred to as the thermo-mechanically affected zone (TMAZ) and the heat-affected zone (HAZ) [13]. In the HAZ, the temperatures reached affect material microstructure and mechanical properties without plastic deformation, whereas in the TMAZ, material deforms plastically by the high temperature produced by the welding tool [14]. In the TMAZ there are two additional areas, one with elongated grains, deformed in the tool rotation direction, and another one with a fully recrystallized microstructure.…”

Section: Introductionmentioning

confidence: 99%

On the Friction Stir Welding of Al 7075 Thin Sheets

Dimopoulos

Vairis

Vidakis

et al. 2020

Metals

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The aim of this work was to weld thin sheets (2 mm) of Al 7075 in a butt joint configuration using friction stir welding and to identify the appropriate tool geometry and optimum process parameters. Two tools were produced with heat treatable low alloy steel WNr 1.6582/DIN 34CrNiMo6 with a different pin diameter (3 mm and 4 mm). Welding was performed at a range of rotation speeds 1000–2500 rpm and various welding speeds 80–800 mm/min. The tensile strength was measured to evaluate mechanical properties. Results showed that despite the difficulties in friction stir welding thin plates, sound joints can be produced in a repeatable manner, without visible wear on the welding tool. The mechanical strength of the welds showed a decrease (33.75%) over that of the parent material. The mechanical strength was less affected by rotation speed than welding speed and there was a significant decrease in tensile strength compared to the parent material.

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“…Several studies [5][6][7], [10,11], [14][15][16][17][18] were performed on the thermal and mechanical effects produced during FSW. These effects are mainly due to the asymmetry of the flow around the material, caused by the difference in the relative velocity between the two sides of the weld.…”

Section: Introductionmentioning

confidence: 99%

“…It is characterized by severe plastic deformation and elongation of the base material grains as well as exposure to elevated temperature because of the proximity to the WN. In the heat-affected zone (HAZ) which is common to all welding processes, the material experiences thermal conditions that modify its microstructure and/or the mechanical properties without any plastic deformation [16]. Peel et al 2003 [7] studied the microstructure, the mechanical properties and the residual stresses as a function of the welding speed in AA5083 Friction Stir Welds.…”

Section: Introductionmentioning

confidence: 99%

“…Rodrigues DM et al [24] studied the FSW of 1mm thick AA 6016-T4 aluminum alloy with a conical shoulder (HW) and a scrolled shoulder (CW) tool, concluding that the differences in tool geometry and welding parameters significantly affect the material flow as well as the microstructure. Ivan Galvão et al [16] studied 1 mm thick plates of dissimilar materials indicating that the application of the FSW process in the joining of very thin plates is feasible, with the increase of the welding speed raising the grain refinement and increasing the hardness and the tensile strength of the specimens. Yong-Jai Kwon et al [25] focused on the study of the FSW of 2 mm 5052 aluminum alloy plates with different rotational speeds ranging from 500 to 3000 rpm under a constant traverse speed of 100 mm/min, showing that defectfree welds are successfully obtained for all the rotational speeds employed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Tool Rotational Speed on the Mechanical Properties of Thin AA1050 Friction Stir Welded Sheets

Vidakis¹,

Vairis²,

Diouf³

et al. 2016

JESTR

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Friction Stir Welding (FSW) is a solid-state process which is extensively used to join aluminum sheet structures in a wide variety of industries, including aerospace, automotive, railway, and maritime. This research is focused on the influence of the tool rotational speed on the mechanical properties of friction stir welded 2 mm thick AA1050 aluminum alloys butt joints. Tool rotational speeds from 500rpm to 2000 rpm with a 250rpm step and 1.7mm and 1.8mm plunge depth values were used. Experiments were conducted in a vertical Haas VF2 3 axis CNC milling machine center. Three joint specimens were tested for each case. The tensile properties of the friction stir welded AA1050 aluminum alloys were investigated in the direction perpendicular to the friction stir welding joint. Tensile experiments were conducted using a Schenk Trebel Co. tensile test machine and the Ultimate Tensile Strength, the Young's Modulus and strain were calculated. Results were compared with reference material values. In all cases the calculated values were significantly lower than the equivalent reference material values which is expected due to the fact that the area of the welding joint was lower than the specimen cross sectional area, for the welding conditions employed.

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Friction Stir Welding of very thin plates

Abstract: ResumoOs resultados obtidos no presente estudo, referentes a friction stir welding de chapas de alumínio, cobre, cobre-zinco

Cited by 20 publications

References 23 publications

Effect of High Rotational-Speed Friction-Stir Welding on Microstructure and Properties of Welded Joints of 6061-T6 Al Alloy Ultrathin Plate

Effect of High Rotational-Speed Friction-Stir Welding on Microstructure and Properties of Welded Joints of 6061-T6 Al Alloy Ultrathin Plate

On the Friction Stir Welding of Al 7075 Thin Sheets

Effect of the Tool Rotational Speed on the Mechanical Properties of Thin AA1050 Friction Stir Welded Sheets

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