Effect of the Surface State of Steel on the Microstructure and Mechanical Properties of Dissimilar Metal Lap Joints of Aluminum and Steel by Friction Stir Welding

Chen, Y.C.; Nakata, Kohei

doi:10.1007/s11661-008-9523-4

Cited by 119 publications

(69 citation statements)

References 17 publications

(18 reference statements)

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“…Deformation of the steel sheet during tool penetration will also promote mechanical interlocking, which will contribute to joint strength [8]. However, this will also promote formation of intermetallic compounds when aluminum and steels alloys are joined, which may contain pre-existing cracks, have high hardness, and thus limit joint strength [10,12,13]. It should be noted that in comparison, other works involving diffusion bonding and adhesive bonding have always found that strengths are maximized when the thickness of reaction layer or intermetallic compound regions is minimized.…”

Section: Introductionmentioning

confidence: 99%

Role of welding parameters on interfacial bonding in dissimilar steel/aluminum friction stir welds

Shen

Chen

Haghshenas

et al. 2015

Engineering Science and Technology, an International Journal

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a b s t r a c tIn this study, lap welds between Al5754 to DP600 steel (aluminum plate top, and steel plate bottom) were manufactured by friction stir welding (FSW). The effects of welding parameters (i.e. travel speeds and penetration depth into lower steel sheet) on the interfacial bonding, tensile strength, and failure mechanism were investigated. The results show that intermetallic compound of Fe 4 Al 13 was detected at the Al/Fe interface. The weld strength increases significantly by increasing the penetration depth into the lower steel substrate at all travel speeds. The failure mode under overlap shear loadings is premature failure through the aluminum substrate when the penetration depth is more than 0.17 mm, and shear fracture when the penetration depth is less than 0.17 mm.

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Section: Introductionmentioning

confidence: 99%

Role of welding parameters on interfacial bonding in dissimilar steel/aluminum friction stir welds

Shen

Chen

Haghshenas

et al. 2015

Engineering Science and Technology, an International Journal

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“…It is believed that higher surface roughness will increase the adhesive properties between two materials [38][39][40]. For A5052-PET joints with treated surface roughness, the PET would soften and conform to the A5052 irregularities, creating an interfacial region.…”

Section: Joining Mechanismmentioning

confidence: 99%

Effect of Surface States on Joining Mechanisms and Mechanical Properties of Aluminum Alloy (A5052) and Polyethylene Terephthalate (PET) by Dissimilar Friction Spot Welding

Yusof

Muhamad

Moshwan

et al. 2016

Metals

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Abstract:In this research, polyethylene terephthalate (PET), as a high-density thermoplastic sheet, and Aluminum A5052, as a metal with seven distinct surface roughnesses, were joined by friction spot welding (FSW). The effect of A5052's various surface states on the welding joining mechanism and mechanical properties were investigated. Friction spot welding was successfully applied for the dissimilar joining of PET thermoplastics and aluminum alloy A5052. During FSW, the PET near the joining interface softened, partially melted and adhered to the A5052 joining surface. The melted PET evaporated to form bubbles near the joining interface and cooled, forming hollows. The bubbles have two opposite effects: its presence at the joining interface prevent PET from contacting with A5052, while bubbles or hollows are crack origins that induce crack paths which degrade the joining strength. On the other hand, the bubbles' flow pushed the softened PET into irregularities on the roughened surface to form mechanical interlocking, which significantly improved the strength. The tensile-shear failure load for an as-received surface (0.31 µm R a ) specimen was about 0.4-0.8 kN while that for the treated surface (>0.31 µm R a ) specimen was about 4.8-5.2 kN.

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“…Compared with the traditional welding method, this technology produces a high joint quality, small welding distortion, small residual stress, green welding process and no pollution, and is widely used in aerospace, shipping, transportation and other fields [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Zhang

et al. 2017

Metals

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Abstract:The corrosion behavior of keyhole-free friction stir spot welded joints of dissimilar 6082 aluminum alloy and DP600 galvanized steel in 3.5% NaCl solution has been investigated by the immersion test and electrochemical analysis. The surface of the aluminum alloy produced exfoliation and pitting corrosion. The pitting occurred seriously on the interface of the 6082 aluminum alloy, but the steel had no corrosion. The corrosion galvanic couples were formed between elements of Si and Fe with a high electrode potential, and Mg and Al with a low electrode potential, around them. Mg and Al elements of Mg 2 Si and Si-containing solid-solution phase α (Al) preferentially became an anodic dissolution and formed exfoliation corrosion around the Si elements. Fe-rich phase θ (Al 3 Fe) as the cathode caused corrosion of Mg and formed pitting around Mg-rich phase β (Al 3 Mg 2 ) as the anode. The sequence of the corrosion resistance of different areas of the joints (with decreasing corrosion resistance) was WNZ (Weld Nugget Zone) > TMAZ (Thermo-mechanically Affected Zone) > BM (Base Metal) > HAZ (Heat-affected Zone). The joints of keyhole-free FSSW (Fiction Stir Spot Welding) of dissimilar 6082 aluminum alloy and DP600 galvanized steel have better corrosion resistance than base metal in 3.5% NaCl solution.

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Effect of the Surface State of Steel on the Microstructure and Mechanical Properties of Dissimilar Metal Lap Joints of Aluminum and Steel by Friction Stir Welding

Cited by 119 publications

References 17 publications

Role of welding parameters on interfacial bonding in dissimilar steel/aluminum friction stir welds

Role of welding parameters on interfacial bonding in dissimilar steel/aluminum friction stir welds

Effect of Surface States on Joining Mechanisms and Mechanical Properties of Aluminum Alloy (A5052) and Polyethylene Terephthalate (PET) by Dissimilar Friction Spot Welding

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

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