Enhancing heat and mass transfer to suppress void defects in friction stir welding by superimposing ultrasonic vibration

• Autorzy: Wang Xue , Zhang Xiankun , Shi Lei , Wu Chuangsong , Chen Gaoqiang

Identyfikatory

DOI

10.1007/s43452-023-00799-0

• Języki publikacji: EN

Abstrakty

EN

Heat and mass transfer in the process of friction stir welding (FSW) determine the weld formation quality. Meanwhile, the formation of voids in FSW limits welding speed improvement and welding efficiency. Although superimposing ultrasonic vibration can be adopted as an effective means to restrain the formation of voids, the potential suppression mechanism was still unrevealed. Herein, a multi-physical model using the shear stress boundary conditions was put forward to quantitatively study the influence of ultrasonic vibration on the heat and mass transfer behaviors and the resulting weld formation which was also validated experimentally. Our results show that ultrasonic vibration in FSW slightly enhances the heat flux at the tool-work piece interfacial contact surface as well as the plastic deformation heat generation near the tool. Therefore, the high-temperature area (higher than 690 K) near the tool pin side increases from 2.11 to 2.29 mm. The slightly higher heat rate and temperature enhance the fluidity of plastic material, resulting in an obvious increase in the flow velocity. As a consequence, the plastic material moves farther to fill the cavity at the rear advancing side, which is conducive to eliminating the void defects. The maximum strain rate on z = 2 mm horizontal plane at the AS is 206.7 s⁻¹ in UVeFSW, while it is 13.5 s⁻¹ in CFSW. The strain rate of the contact interface on AS increases by nearly 5 times, which implies an enhanced plastic material flow and is the main reason for suppressing void defects by superimposing ultrasonic vibration in FSW.

Słowa kluczowe

EN

friction stir welding; ultrasonic vibration; heat transfer; defects; mass flow

PL

spawanie tarciowe; wibracje ultradźwiękowe; wymiana ciepła; wady; przepływ masy

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 4
• Strony: art. e256, 1--16
• Opis fizyczny: Bibliogr. 40 poz., il., tab., rys., wykr.

Twórcy

autor

Wang Xue

• Institute of Materials Joining, Shandong University, Jinan, People’s Republic of China

autor

Zhang Xiankun

• Institute of Materials Joining, Shandong University, Jinan, People’s Republic of China

autor

Shi Lei

• Institute of Materials Joining, Shandong University, Jinan, People’s Republic of China
• Shandong University-Weihai Research Institute of Industrial Technology, Weihai, People’s Republic of China

• https://orcid.org/0000-0002-9831-1872

autor

Wu Chuangsong

• Institute of Materials Joining, Shandong University, Jinan, People’s Republic of China
• Shandong University-Weihai Research Institute of Industrial Technology, Weihai, People’s Republic of China

autor

Chen Gaoqiang

• Department of Mechanical Engineering, Tsinghua University, Beijing, People’s Republic of China

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