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作者:

Jiang, Fan (Jiang, Fan.) | Li, Wenlong (Li, Wenlong.) | Xu, Bin (Xu, Bin.) | Cheng, Wei (Cheng, Wei.) | Ma, Xinqiang (Ma, Xinqiang.) | Zhang, Guokai (Zhang, Guokai.) | Xu, Zifa (Xu, Zifa.) | Chen, Shujun (Chen, Shujun.)

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EI Scopus SCIE

摘要:

In this study, the 16 mm thick aluminum alloy was successfully welded using variable polarity plasma arc (VPPA) keyhole welding. The microstructure and microhardness distributions of the weld were systematically measured along its thickness and width. To evaluate tensile strengths along the weld thickness, tensile specimens were divided into upper, middle, and lower sections. The surface temperature distribution of the weld pool, along with the temperature profile through its thickness, was measured using thermometers and thermocouples. Numerical simulations were employed to calculate the pressure oscillations along the keyhole boundary and to analyze the temperature and flow field distributions of the VPPA. The findings initially revealed a homogeneous and refined microstructure distribution within the weld seam. The weld zone exhibited higher microhardness compared to the base metal (BM). The weld demonstrated a tensile strength of 187.86 MPa and an elongation of 24.76%, corresponding to 95.57% and 78.65% of the BM, respectively. The tensile strengths and elongations of the upper, middle, and lower sections displayed a similar distribution to that of the entire weld. The mechanism underlying the microstructure distribution of the weld was significantly influenced by the temperature distribution of the weld pool, dynamic pressure oscillations in the mushy zone, and fluid flow of the weld pool. Specifically, the mechanism whereby pressure oscillations fracture existing nuclei and generate multiple new nuclei has been proposed to explain the refined microstructure distribution. These findings provide crucial insights for optimizing VPPA keyhole welding technology, ensuring stable and high-quality welding of thick aluminum alloys.

关键词:

Tensile strength Variable polarity plasma arc Thick aluminum alloy Microstructure Keyhole welding Microhardness

作者机构:

  • [ 1 ] [Jiang, Fan]Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Li, Wenlong]Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Xu, Bin]Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Minist Educ, Beijing 100124, Peoples R China
  • [ 4 ] [Zhang, Guokai]Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Minist Educ, Beijing 100124, Peoples R China
  • [ 5 ] [Chen, Shujun]Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Minist Educ, Beijing 100124, Peoples R China
  • [ 6 ] [Jiang, Fan]Qilu Univ Technol, Laser Inst, Shandong Acad Sci, Jinan 370000, Peoples R China
  • [ 7 ] [Li, Wenlong]Qilu Univ Technol, Laser Inst, Shandong Acad Sci, Jinan 370000, Peoples R China
  • [ 8 ] [Xu, Bin]Qilu Univ Technol, Laser Inst, Shandong Acad Sci, Jinan 370000, Peoples R China
  • [ 9 ] [Cheng, Wei]Qilu Univ Technol, Laser Inst, Shandong Acad Sci, Jinan 370000, Peoples R China
  • [ 10 ] [Ma, Xinqiang]Qilu Univ Technol, Laser Inst, Shandong Acad Sci, Jinan 370000, Peoples R China
  • [ 11 ] [Xu, Zifa]Qilu Univ Technol, Laser Inst, Shandong Acad Sci, Jinan 370000, Peoples R China
  • [ 12 ] [Xu, Bin]Beijing Univ Technol, Phys Sci Res Inst, Beijing 100124, Peoples R China
  • [ 13 ] [Chen, Shujun]Beijing Univ Technol, Phys Sci Res Inst, Beijing 100124, Peoples R China
  • [ 14 ] [Li, Wenlong]Laser Adv Mfg Technol Key Lab, Liaocheng 252000, Peoples R China
  • [ 15 ] [Cheng, Wei]Laser Adv Mfg Technol Key Lab, Liaocheng 252000, Peoples R China
  • [ 16 ] [Ma, Xinqiang]Laser Adv Mfg Technol Key Lab, Liaocheng 252000, Peoples R China
  • [ 17 ] [Xu, Zifa]Laser Adv Mfg Technol Key Lab, Liaocheng 252000, Peoples R China

通讯作者信息:

  • [Xu, Bin]Beijing Univ Technol, Engn Res Ctr Adv Mfg Technol Automot Components, Minist Educ, Beijing 100124, Peoples R China;;

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来源 :

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

ISSN: 2238-7854

年份: 2024

卷: 31

页码: 1703-1716

6 . 4 0 0

JCR@2022

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