高频振动对AZ31镁合金TIG焊接接头微观组织与力学性能的影响（英文）

发布时间：2018-08-25 10:05

【摘要】：设计一套能对焊件在水平和垂直方向进行频率15 k Hz、最大输出功率2 k W激振的TIG焊装置。在此基础上,对厚度3 mm和1 mm的AZ31镁板在不同激振方向、激振振幅以及剖口形式下进行焊接,对比分析不同条件下焊接接头的组织与性能。发现激振使得AZ31 TIG焊缝熔合区的组织显著细化,第二相β-Mg17Al12的析出减少;另外,焊缝区域显微硬度及试样的整体抗拉强度和伸长率提高;振动对厚板焊缝的影响更大,且垂直方向激振的影响更明显。振动对AZ31 TIG焊接接头组织与性能的影响,取决于焊接熔池金属凝固行为以及超声波激振能量的传递状态等因素,与激振振幅、方向以及焊接剖口角度和板厚等密切相关。
[Abstract]:A set of TIG welding device is designed, which can excite the welding parts in horizontal and vertical direction with the maximum output power of 2 kW at 15 k Hz,. On this basis, the structure and properties of the AZ31 magnesium plate with thickness of 3 mm and 1 mm were compared and analyzed under different excitation directions, vibration amplitude and profile. It was found that the microstructure of the fusion zone of AZ31 TIG weld was significantly refined by exciting vibration, and the precipitation of the second phase 尾 -Mg17Al12 was decreased, in addition, the microhardness of weld zone and the tensile strength and elongation of the whole specimen were increased, and the effect of vibration on the weld seam of thick plate was greater. The effect of vertical excitation is more obvious. The effect of vibration on the microstructure and properties of AZ31 TIG welded joints depends on the solidification behavior of weld pool metals and the state of transfer of ultrasonic excitation energy, which is closely related to the amplitude and direction of excitation, the angle of welding profile and the thickness of plate.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：Project(2012ZX04010-081)supported by the National High-tech Research and Development Program of China Project(CDJZR12110072)supported by Fundamental Research Funds for Central Universities of China
【分类号】：TG444.74

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