Interface microstructure study of friction stir lap joint of AC4C cast aluminum alloy and zinc-coated steel

Chen, Y.C.; Komazaki, T.; Kim, Y.G.; Tsumura, Takuya; Nakata, Kohei

doi:10.1016/j.matchemphys.2008.04.038

Cited by 85 publications

(38 citation statements)

References 17 publications

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“…Chen et al [21] used Zn coating on the steel surface to improve the weldability of Al and steel by means of promoting the formation of Al-Zn low melting point eutectic structure. Chen et al [22] also found that the thickness of IMC layer increased from 7.7 to 58.1 µm with decreasing welding speed, which significantly affected the joint strength.…”

Section: Introductionmentioning

confidence: 94%

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Microstructure and Mechanical Properties of Al/Steel Friction Stir Lap Weld

Wan

Huang

2017

Metals

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Abstract:The friction stir welding tool with convex pin tip was designed to realize the lap joining of 6082-T6 aluminum alloy and Q235A steel. With decreasing welding speed and increasing rotation speed, the basic constitutions of mixed stir zone changed from α-Fe fine grains, thin intermetallic compound (IMC) and Al/Fe composite structure to hook-like and chaotic mixed layered structure, resulting in joint deterioration. The maximum shear load can reach 7500 N and is predominately affected by the morphology of the IMC layers, which in turn depend on rotation speed, welding speed and other parameters. Nano-hardness decreases from about 3.9 GPa in the upper steel surface layer to about 1.3 GPa in the steel base material. Microhardness profile reveals that the maximum hardness occurs at the interface zone. The morphology of layered structure, FeAl 3 IMC thickness and steel grain size can be controlled by choosing suitable welding parameters and tool shape.

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Section: Introductionmentioning

confidence: 94%

“…Researchers have also studied Al/steel friction stir lap welding (FSLW) joint [18][19][20][21][22]. Kimapong and Watanabe [18] carried out that the maximum shear load of FSLW joint of 5083 aluminum alloy and SS400 mild steel could reach about 77% of aluminum alloy base metal.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al/Steel Friction Stir Lap Weld

Wan

Huang

2017

Metals

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“…Chen et al [17] suggested the Zn coating on steel could improve the weldability of Al and steel through promoting the formation of Al-Zn low melting point eutectic structure. They also did another FSW lap joining study [18] and reported that the thickness of the IMC layer increases from 7.7 to 58.1 μm with decreasing welding speed, which significantly influences joint strength. The IMC composition was analyzed to be mainly Fe 2 Al 5 and Fe 4 Al 13 .…”

Section: Introductionmentioning

confidence: 94%

Microstructural evolution during friction stir welding of dissimilar aluminum alloy to advanced high-strength steel

Lan

Liu

2015

Int J Adv Manuf Technol

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One type of advanced high-strength steel, transformation-induced plasticity (TRIP) 780 steel, has been successfully welded to aluminum alloy Al 6061-T6 using friction stir welding (FSW) technique. The major Al-Fe interface in the steel side has been analyzed in detail under various welding conditions, where a thin layer of intermetallic compound (IMC) with a thickness of less than 1 μm can be generally observed and the composition was identified to be either FeAl or Fe 3 Al. This thin IMC layer can be shown to be beneficial for joint strength. Optical microscopy and scanning electron microscopy showed the weld nugget was distributed with sheared-off steel fragments encompassed IMC layers or simply IMC particles. Finally, a stirred-over steel strip embedded in the aluminum matrix was revealed, which would determine the failure mode and is crucial to joint quality based on tensile test results.

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“…Nevertheless, new techniques such as explosive welding, friction stir welding and diffusion brazing have been developed for welding solid or mushy metal, although these methods have many limitations and are difficult to implement. Recently, welding-brazing of aluminum alloy to steel has become a hot research method in dissimilar metals joining, which includes arc weldingbrazing and laser welding-brazing with the filler metal [4][5][6]. Compared with laser welding-brazing method, arc welding-brazing has many merits such as simple processing, convenient operation, low cost and high flexibility, etc.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel

Lin

Song

et al. 2009

Front. Mater. Sci. China

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Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel was investigated, and the wettability and spreadability of aluminum filler metal on the steel surface were analyzed. The resultant joint was characterized in order to determine the brittle intermetallic compound (IMC) in the interfacial layer, and the mechanical property of the joint was tested. The results show that the zinc coated layer can improve the wettability and spreadability of liquid aluminum filler metal on the surface of the steel, and the wetting angle can reach less than 20°. The lap joint has a dual characteristic and can be divided into a welding part on the aluminum side and a brazing part on the steel side. The interfacial IMC layer in the steel side is about 9.0 μm in thickness, which transfers from (α-Al + FeAl 3 ) in the welded seam side to (Fe 2 Al 5 + FeAl 2 ) and (FeAl 2 + FeAl) in the steel side. The crystal grain of the welded seam is obviously larger in size in the aluminum side. The local incomplete brazing is found at the root of the lap joint, which weakens the property of the joint. The fracture of the joint occurs at the root and the average tensile strength reaches 90 MPa.

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Interface microstructure study of friction stir lap joint of AC4C cast aluminum alloy and zinc-coated steel

Cited by 85 publications

References 17 publications

Microstructure and Mechanical Properties of Al/Steel Friction Stir Lap Weld

Microstructure and Mechanical Properties of Al/Steel Friction Stir Lap Weld

Microstructural evolution during friction stir welding of dissimilar aluminum alloy to advanced high-strength steel

Dissimilar metals TIG welding-brazing of aluminum alloy to galvanized steel

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