【摘要】 选用Ni Cl2作为活性剂,在对AZ91镁合金板进行A-TIG焊的过程中引入直流纵向磁场,通过调节磁场电流,研究不同活性剂涂敷量下,焊缝熔深、熔宽、硬度及显微组织的变化规律,以确定最佳的匹配参数.结果表明,在所进行的试验范围内,当磁场电流Ic=1.5 A,活性剂涂敷量为5 mg/cm2时,焊缝获得最大熔深5.0 mm,且此时的力学性能最佳,显微硬度达到73.8 HV.磁场与活性剂的双重作用,使得焊缝熔深增加的同时力学性能显著提高.更多还原

【Abstract】 NiCl2 was selected as activating flux,and the longitudinal magnetic field was used in A-TIG welding process of AZ91 magnesium alloy plate. By adjusting the magnetic field current and the coating amount of activating flux their effects on the weld penetration depth,width,hardness and microstructure were studied to determine the best matching parameters. The results show that,in experiments,at the magnetic field current of Ic= 1. 5 A and the activating flux coating amount of 5 mg / cm2,the deepest weld penetration and the highest microhardness are obtained,which can reach up to 5. 00 mm and 73. 8 HV,respectively. The combined action of the magnetic field and the activating flux not only increases the weld penetration depth,but also improves the mechanical properties.更多还原