铝制结构广泛应用于车辆、航空等多个领域,焊接技术在铝制品应用过程中发挥着重要作用,准确预测铝制品在焊接过程中温度场分布和变化规律,对焊接理论以及工程实际具有重要的指导意义。本文基于COMSOL软件,模拟了300 mm * 150 mm * 8 mm...铝制结构广泛应用于车辆、航空等多个领域,焊接技术在铝制品应用过程中发挥着重要作用,准确预测铝制品在焊接过程中温度场分布和变化规律,对焊接理论以及工程实际具有重要的指导意义。本文基于COMSOL软件,模拟了300 mm * 150 mm * 8 mm的I型坡口的铝板焊件的焊接过程,主要讨论高斯热源、双椭球热源和组合热源模型下,焊接温度场分布和变化规律。研究发现,随着热源模型的改进,焊缝区域的温度场逐渐增大;在双椭球热源模型下,随着形状参数的增大,研究区域内的温度逐渐减小;在组合热源模型下,随着焊接参数的增大,焊缝区域内的温度场逐渐减小。本文得出的结论对焊接工艺的改进具有指导意义。展开更多
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 aero...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.展开更多
文摘铝制结构广泛应用于车辆、航空等多个领域,焊接技术在铝制品应用过程中发挥着重要作用,准确预测铝制品在焊接过程中温度场分布和变化规律,对焊接理论以及工程实际具有重要的指导意义。本文基于COMSOL软件,模拟了300 mm * 150 mm * 8 mm的I型坡口的铝板焊件的焊接过程,主要讨论高斯热源、双椭球热源和组合热源模型下,焊接温度场分布和变化规律。研究发现,随着热源模型的改进,焊缝区域的温度场逐渐增大;在双椭球热源模型下,随着形状参数的增大,研究区域内的温度逐渐减小;在组合热源模型下,随着焊接参数的增大,焊缝区域内的温度场逐渐减小。本文得出的结论对焊接工艺的改进具有指导意义。
基金the funding (UniversityIndustry Engagement Grant)support provided by the Universiti Sains Malaysia under the Teaching Fellowship Scheme
文摘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.
