AZ31B/7075-T6 alloys friction stir lap welding with a zinc interlayer

Niu, Shiyu; Ji, Shude; Yan, Dejun; Meng, Xiangchen; Xiong, Xuhai

doi:10.1016/j.jmatprotec.2018.08.009

Cited by 63 publications

(31 citation statements)

References 22 publications

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“…Before welding, the BMs were polished by sand paper to remove the oxide layer, and then cleaned by alcohol. Mg alloy was placed as the upper plate according to the previous works [16,17]. Figure 1 displays the schematic of the Zn-added FSLW process of Al/Mg dissimilar alloys.…”

Section: Methodsmentioning

confidence: 99%

“…The welding parameters significantly influence the joint strength. According to the report by Niu et al [16], the rotating velocity of 1000 rpm and the welding speed of 50 mm/min were selected.…”

Section: Methodsmentioning

confidence: 99%

“…The molten Zn in the SZ is stirred and transferred by the rotating pin and eventually dispersed in the SZ bottom. The dispersed Zn as a lubricant is beneficial to reducing the friction coefficient between the materials, and then decreasing the flow stress of the materials in the SZ bottom [16]. Therefore, the SZ bottom is enlarged, and part of the cold lap extending into the SZ is broken and then dispersed in the SZ bottom, thereby increasing the ELW of the joint.…”

Section: Methodsmentioning

confidence: 99%

“…This problem can be solved by plunging the rotating pin into the lower plate during FSLW. Niu et al [16] found that when the rotating pin plunged into the lower plate, the tensile shear strength of dissimilar AZ31B Mg/7075-T6 Al alloys FSLW joint could be greatly improved by the addition of the Zn interlayer, which was because that the Al-Mg IMCs in the SZ were replaced by the Mg-Zn IMCs.…”

Section: Introductionmentioning

confidence: 99%

“…The results stated that the maximum joint strength of 76 N mm −2 was obtained when the thickness of Zn interlayer was 100 μm. At present, there are few researches on FSLW of Al/Mg dissimilar alloys with a Zn interlayer by plunging the rotating pin into the lower plate, and the selection of the Zn interlayer thickness is unilateral [16][17][18]. On the basis of previous works [16,17], the effects of the Zn interlayer thickness on the joint formation, microstructure and tensile property of FSLW joint were studied systematically in this study.…”

Section: Introductionmentioning

confidence: 99%

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Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness

Liu

Niu

Ren

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The pure Zn foils with different thicknesses (0.02, 0.05, 0.1, 0.2 and 0.3 mm) were selected as interlayers to improve the quality of friction stir lap welding joint of 7075-T6 Al and AZ31B Mg dissimilar alloys. The effects of the interlayer thickness on joint formation, microstructure and tensile strength were analyzed. The results displayed that the maximum length of the boundary between stir zone (SZ) and thermo-mechanically affected zone in lower plate was obtained by the addition of the Zn interlayer with 0.05 mm thickness. The Mg-Zn intermetallic compounds (IMCs) were discontinuously distributed in the SZ, replacing the continuous Al-Mg IMCs. The size of Mg-Zn IMCs increased with the increase in the thickness of the Zn interlayer. The maximum tensile shear strength of 276 N mm −1 was obtained by the addition of 0.05 mm Zn foil, which increased by 45.6% of that of the joint without the Zn foil addition.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness

Liu

Niu

Ren

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Improving the Mechanical Property of Dissimilar Al/Mg Zn‐Added Ultrasound‐Assisted Friction Stir Lap Welding Joint by Back Propagation Neural Network–Gray Wolf Optimization Algorithm

Song

Ren

et al. 2019

Adv Eng Mater

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Process parameters of rotating velocity, welding speed, Zn interlayer thickness, and ultrasound power are optimized by the hybrid of back propagation neural network (BPNN) and gray wolf optimization algorithm (GWOA) to obtain a high‐quality Zn‐added ultrasound‐assisted friction stir lap welding joint of 7075‐T6 Al/AZ31B Mg dissimilar alloys. The results state that the prediction accuracy of the trained BPNN model is acceptable. The optimal process parameters combination is obtained by the GWOA which is combined with the trained BPNN. The verification tests are performed under the executable optimal solution, which consists of the rotating velocity of 1054 rpm, the welding speed of 54 mm min−1, the Zn interlayer thickness of 0.05 mm, and the ultrasound power of 1568 W. The tensile shear load of the joint reaches 9.05 kN, and the strength is 11.8% larger than that of the reported optimal joint. The artificial intelligence optimization method of GWOA combined with BPNN can accurately predict and optimize the joint strength, which has great time and economic advantages.

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