Aluminium-steel lap joining by multipass friction stir welding

Leitão, C.; Arruti, Ekaitz; Aldanondo, Egoitz; Rodrigues, D.M.

doi:10.1016/j.matdes.2016.05.101

Cited by 58 publications

(22 citation statements)

References 20 publications

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“…The results obtained using FSW show that the use of this technology leads to the elimination of the intermetallic layers, with this resulting in an increase of the overall strength of the joints. The main disadvantage of this method is that friction stir welded connections are characterised by a non-uniform distribution of the mechanical properties across the weld [13].…”

Section: Introductionmentioning

confidence: 99%

Static strength and design of aluminium-to-steel thin welded joints

et al. 2018

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Welding together dissimilar materials, and, in particular, aluminium alloys to steel, has always been a challenge because of the significant difference in their mechanical, thermo-physical and metallurgical properties which causes the formations of hard and brittle intermetallic phases in the welding region. Recently, EWM® has developed a welding process known as ColdArc®, where the heat input and arc stability are precisely controlled. The present study was designed to investigate the static strength of aluminium-to-steel thin welded joints manufactured using EWM coldArc® welding technology. Butt, lap and cruciform welded connections were prepared to assess tensile strength and failure mode of these hybrid welded joints. The visual examination of the fracture surfaces revealed that, regardless of the geometry of the welded connections, the fracture of the joints always took place in the heat-affected zone (HAZ) on the aluminium side. This inspection indicated that the use of EWM coldArc® welding technology had improved the strength of the hybrid welded joint significantly and removed the problem of having a brittle phase in the welding zone. The results obtained from this investigation shows that Eurocode 9 can also be used to design aluminium-tosteel thin welded joints.

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Section: Introductionmentioning

confidence: 99%

Static strength and design of aluminium-to-steel thin welded joints

et al. 2018

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“…Although, the dissimilar metals welding between steel and aluminum alloys was first published for more than 70 years ago [1], the difficulty to suppress the intermetallic compound phase, which is the severe problems in dissimilar metals welding between steel and aluminum alloys, is still the challenge for welding technologists. Up to now, the most successful welding technique to suppress intermetallic compound phase during welding between bare steel and aluminum alloys is to apply solid state mixing by friction stir welding process, and friction welding, or to apply self-brazing techniques with laser welding, TIG welding, hybrid welding, metal inert gas welding process, etc., as refer in the references [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, in some cases, especially for the welding of steel components, which is frequently in direct contact with water and high humidity environment during application, zinc-coated steel is seriously required in order to improve corrosion resistance of steel.…”

Section: Introductionmentioning

confidence: 99%

GTAW of Zinc-Coated Steel and Aluminum Alloy

Borrisutthekul¹,

Seangsai²,

Paonil³

2018

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Abstract. In this study, effect of zinc-coated layer on steel sheet of dissimilar metals welding between SCGA270C steel and A5052 aluminum alloy by GTAW was investigated. In the experiments, two types of self-brazing welding; 1) welding between non-zinc-coated steel/aluminum alloy, and 2) welding between zinc-coated steel/aluminum alloy, were carried out. The lap joint configuration in which steel was lying on top of aluminum alloy was applied. From the results of zinc-coated steel case, the reaction between the lowmelting-point zinc with both molten and solid aluminum alloy provided larger welding width between two metal sheets. Moreover, zinc, which is heavier than aluminum alloy, was fallen down but not well mixed into molten aluminum alloy. Consequently, thick intermetallic compound layer near welding interface between steel/aluminum alloy was formed. Comparison of load resistance between non zinc-coated case and zinc-coated steel case, the wider welding width which consequently improvement the load resistance of the welds was obtained, when using low heat input. However, when applying higher, significant contraction of aluminum welding pool promoted crack along the non-uniform chemical composition zone in case of zinc-coated steel. These cracks were the cause of reduction of load resistance of the welds between zinc-coated steel/aluminum alloy.

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“…They also concluded that the joint with zinc foil showed better joint strength than that without zinc foil. Leitao et al [22] observed that the use of multi-pass welding increases the bonding area as well as fatigue strength in dissimilar aluminium steel FS lap welding. From this discussion, it is clear that very few works have reported on the FS lap welding of aluminium alloys and automotive advanced high-strength steel (AHSS).…”

Section: Introductionmentioning

confidence: 99%

Investigation on lap-joint friction stir welding between AA6351 alloys and DP800 steel sheets

Nguyen

Thi

et al. 2018

Sādhanā

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With continuous growth and stringent demand for weight reduction in automotive structures, the automotive industry has shown an increasing interest in dissimilar aluminium-steel welding. Dissimilar lap joint between AA6351 alloys of 2 mm thickness and DP800 advanced high-strength dual-phase steel of 1 mm thickness has been attempted and joined successfully by friction stir welding with different combinations of parameters. The experimental results of this research work clearly indicate that joining of advanced highstrength steel and aluminium in lap-joint configuration is quite feasible with friction stir welding. Microstructural characterization has been performed by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). An intermetallic compounds layer was found in the interface of steel and aluminium with thickness of less than 7 lm and it was identified as Al 2 Fe and Al 3 Fe by XRD method. Thermal cycle has been measured and correlated with the microstructure. Shear tensile test has been performed for determining the maximum failure load for different combinations of parameters. Finally, mechanical properties and microstructural observation are correlated with each other.

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Aluminium-steel lap joining by multipass friction stir welding

Cited by 58 publications

References 20 publications

Static strength and design of aluminium-to-steel thin welded joints

Static strength and design of aluminium-to-steel thin welded joints

GTAW of Zinc-Coated Steel and Aluminum Alloy

Investigation on lap-joint friction stir welding between AA6351 alloys and DP800 steel sheets

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