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在真空条件下用低功率YAG激光对AZ31镁合金进行焊接,为了证实真空对等离子体的抑制作用,分别对不同真空度下能量输入和焊接速度对焊缝熔深以及熔宽的影响进行了系统的分析。结果表明随着真空度的提高焊缝熔深以及熔宽有显著的变小。与大气中相比,在真空中获得的焊缝表面成型良好,且有明显的金属光泽。另外发现焊接过程中产生的主要缺陷是咬边、气孔以及裂纹而真空中这样的缺陷相对较少。显微硬度测量表明,真空中的焊缝显微硬度明显高于大气中的焊缝。
In vacuum condition, the low power YAG laser was used to weld the AZ31 magnesium alloy. In order to verify the effect of vacuum on the plasma, the effects of energy input and welding speed on weld penetration and weld width under different vacuum were systematically investigated Analysis. The results show that with the increase of vacuum, weld penetration and melting width decrease significantly. The weld surface obtained in vacuum is well formed and has a metallic luster compared to the atmosphere. In addition, it is found that the main defects in the welding process are undercuts, pores and cracks, and the defects in the vacuum are relatively few. Microhardness measurements show that the micro-hardness of the weld in vacuum is significantly higher than the weld in the atmosphere.