首页> 中文期刊> 《中国有色金属学报(英文版)》 >航空航天用脉冲激光焊接5052-H32铝合金薄板的外观、显微组织和力学性能

航空航天用脉冲激光焊接5052-H32铝合金薄板的外观、显微组织和力学性能

         

摘要

制备0.6 mm厚的AA5052-H32铝合金薄板,研究符合航空航天工业AWS D17.1规范的脉冲激光焊接工艺的最佳参数,如激光脉冲电流、脉冲频率和脉冲持续时间.研究焊缝的显微组织和力学性能,确定参数与焊缝几何形状的关系.在高脉冲能量(25 J)、高平均峰值功率(4.2 kW)和低脉冲能量(17.6 J)、低平均峰值功率(2.8 kW)两种条件下可获得满足AWS D17.1要求的无凝固裂纹的优质焊缝.在较低热量输入下形成的焊缝具有更细小的枝晶结构,且焊缝中Mg的蒸发和硬质相化合物(Al0.5Fe3Si0.5)的形成减少.因此,与在较高热量输入下形成的焊件相比,在较低热量输入下形成的焊件的抗拉强度(168 MPa)提高1.15倍,但其接头处的硬度(111 HV0.1)下降约29%.总之,为了获得满足AWS D17.1要求的0.6 mm厚AA5052-H32脉冲激光焊接接头,选择合适的参数至关重要.%Pulse laser welding of 0.6 mm-thick AA5052-H32 was performed to determine the optimum set of parameters including laser pulse current, pulse frequency and pulse duration that meets the AWS D17.1 specifications for aerospace industry. The microstructure and mechanical properties of the weldments were also investigated. Relationships between the parameters and weld bead geometry were found. High quality weld joints without solidification crack that met AWS D17.1 requirements were obtained at (I) high pulse energy (25 J) and high average peak power (4.2 kW) and (II) low pulse energy (17.6 J) and low average peak power (2.8 kW). The weld joint formed at lower heat energy input exhibited finer dendritic grain structure. Mg vapourisation and hard phase compound (Al0.5Fe3Si0.5) formation decreased in the weld joint formed at lower heat energy input. Consequently, the tensile strength of the weldment formed at lower heat energy input (168 MPa) is by a factor of 1.15 higher but showed~29%decrease in hardness (111 HV0.1) at the joint when being compared with the weldment formed at higher heat energy input. Appropriate parameters selection is critical to obtaining 0.6 mm-thick AA5052-H32 pulse laser weld joints that meet AWS D17.1 requirements for aircraft structures.

著录项

  • 来源
    《中国有色金属学报(英文版)》 |2019年第004期|667-679|共13页
  • 作者单位

    Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

    Industrial and Production Engineering Department, School of Engineering and Engineering Technology, Federal University of Technology Akure, PMB 704, Akure, Ondo State, Nigeria;

    Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

    Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

    Structural Materials Niche Area, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类
  • 关键词

    脉冲激光焊接; 铝合金; 薄板; 显微组织; 力学性能; 凝固裂纹; 金属间化合物;

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