Joining of dissimilar materials

Sepold, G.; Kreimeyer, Michael

doi:10.1117/12.497587

Cited by 16 publications

(13 citation statements)

References 2 publications

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“…However, they still are finer relative to those of base material. That is because some of the broken particles may also grow at the expense of [14,26]. With respect to the HAZ, there is no significant change in the precipitates size compared to base material.…”

Section: Microstructural Evolutionsmentioning

confidence: 85%

“…As the dissolution temperature of η is within 300-350°C [13], this phase can be therefore completely dissolved in the stirred zone [14], while it partially dissolves in the TMAZ. On the other hand, due to the short exposure time to high temperatures, it is possible that there is insufficient time for the complete dissolution of this phase.…”

Section: Microstructural Evolutionsmentioning

confidence: 99%

“…Thus, although the precipitation sequence mentioned in Eq. (1) is far from happening during the present FSW, it is reported [14] that when the local concentration gradient is high, the mentioned phase can form locally during the cooling of FSW nugget. This is a topic that requires more TEM studies.…”

Section: Hardness Profilementioning

confidence: 99%

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Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani

Ghorbani

Soltanipoor³

2014

Int J Adv Manuf Technol

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In the present work, the AA7075-O was subjected to friction stir welding. The rotating and welding speeds were 630 rpm and 32 mm/min, respectively. The diameters of shoulder and pin were 30 and 5.7 mm, respectively. The length of threaded pin was 4.8 mm. The tensile, bending, and hardness tests were carried out on the friction stirwelded specimens. The results show that the strength of friction stir-welded sample was about 15 % (i.e., 25 MPa) higher than that of base metal. By contrast, the ductility of base metal was as much as twice that of friction stirwelded one. According to the obtained hardness profile, the maximum hardness was obtained for the stirred zone with a continuous decrease toward the base metal. This resulted in the formation of cracks after bending specimens prepared from weldment, while there was no sign of crack in the bent specimens taken from base metal. Besides, there are microstructural evolutions from the weldment toward the base metal. These include the variations in the size and distribution of precipitates. The precipitates were coarser in the heat-affected zone, while they were finer in the stirred zone.

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Section: Microstructural Evolutionsmentioning

confidence: 85%

Section: Microstructural Evolutionsmentioning

confidence: 99%

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Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani

Ghorbani

Soltanipoor³

2014

Int J Adv Manuf Technol

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“…In order to reduce the deleterious effect of the intermetallic compounds, their layer thickness needs to be minimized through optimizing processing parameters. It has been demonstrated that minimized intermetallic compound layer thickness of less than 10 mm would result in good mechanical properties [19]. In the present work, although the nugget of FSW of the Al alloy and steel contains Al-Fe intermetallic compounds, they are small with respect to the volume of Al alloy and steel and well distributed, and their size is rather small.…”

Section: Few Intercalated Microstructures and Vortices Can Bementioning

confidence: 95%

Feasibility study of friction stir welding of 6061-T6 aluminium alloy with AISI 1018 steel

Jiang

Kovacevic

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

112

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The present work demonstrates that friction stir welding (FSW) is a feasible route for joining 6061 aluminium (Al) alloy to AISI 1018 steel. The weld has a good weld quality and is free of cracks and porosity. The tensile failure happened at the boundary between the nugget and thermomechanically affected zone of the base Al alloy, indicating that the weld has a higher joining strength. Despite the fact that the hardness fluctuates strongly within the nugget, the average hardness of the nugget is substantially higher than that of the base Al alloy. During FSW, localized melting of the Al alloy in the nugget occurred, and the molten Al alloy reacted strongly with steel pieces spread through the nugget, which resulted in the formation of the Al-Fe intermetallic compounds, Al 13 Fe 4 and Al 5 Fe 2 . The nugget consists of secondary phases including coarse steel pieces and Al-Fe intermetallic compounds, and an Al alloy matrix. These secondary phases contribute to the hardness of the weld.

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“…It is proposed that in FSW, the weld strength of aluminum and steel depends on the IMC, which is often formed during the welding operation of dissimilar materials [ 25 , 46 ]. In addition, process parameters directly affect the thickness of IMC [ 4 , 26 , 28 , 29 , 39 , 40 , 47 , 48 , 49 ]. Hussein et al [ 4 ] presented a cause-effect diagram for IMC thickness formation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure and Tensile Shear Load Characteristics Evaluated by Process Parameters in Friction Stir Lap Welding of Aluminum-Steel with Pipe Shapes

2022

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In recent years, friction stir welding (FSW) of dissimilar materials has become an important issue in lightweight and eco-friendly bonding technology. Although weight reduction of low-rigidity parts has been achieved, the weight reduction has been minimal because high-rigidity parts such as chassis require the use of iron. Considering the difficulty of welding a pipe shape, it is necessary to understand the effect of process parameters on mechanical performance. As a result of the study by various process parameters affecting the joint between aluminum and steel in the shape of a pipe, it can be seen that the tool penetration depth (TPD) has the most important effect on the tensile shear load (TSL). However, the effect of TPD on intermetallic compound (IMC), which has the most important influence on fracture, has not been well established. In this study, the effect of process parameters on IMC thickness and TSL in FSW of A357 cast aluminum and FB590 high tensile steel was investigated to reduce the weight of the torsion beam shaft of an automobile chassis. After the FSWed experiment, measurements were performed using an optical microscope and scanning electron microscopy (SEM) to investigate the microstructure of the weld. The formation of an IMC layer was observed at the interlayer between aluminum and steel. TPD is a major factor in IMC thickness variation, and there is a direct relationship between IMC thickness reduction and TSL increase, except for certain sections where the welding speed (WS) effect is large. Therefore, in order to improve mechanical properties in friction stir lap welding of aluminum and steel for high-rigidity parts, it is necessary to deepen the TPD at a level where flow is dominant rather than heat input.

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Joining of dissimilar materials

Cited by 16 publications

References 2 publications

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Feasibility study of friction stir welding of 6061-T6 aluminium alloy with AISI 1018 steel

Effect of Microstructure and Tensile Shear Load Characteristics Evaluated by Process Parameters in Friction Stir Lap Welding of Aluminum-Steel with Pipe Shapes

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