The effect of welding parameters on the pore formation in laser-pulsed metal inert gas (MIG) hybrid welding of A7N01P-T4 aluminum alloy was investigated. The formation and dynamic behavior of keyholes at different wire feeding speeds were studied using a “sandwich” structure consisting of GG17 glass and A7N01P-T4 aluminum alloy. The types and morphology of pores were analyzed using scanning electron microscopy and an x-ray nondestructive tester. The experimental results indicated that the droplet transfer mode affected the stability of the keyholes. The barrier effect of the large droplets on the laser could cause the bottom of the keyholes to close, forming keyhole-induced pores in the molten pool. The size of the droplet decreased with increasing wire feeding speed; thus, the selection of an appropriate wire feeding speed in laser-pulsed MIG hybrid welding could reduce the barrier effect and effectively reduce the formation of processing pores in the welding seam.The effect of welding parameters on the pore formation in laser-pulsed metal inert gas (MIG) hybrid welding of A7N01P-T4 aluminum alloy was investigated. The formation and dynamic behavior of keyholes at different wire feeding speeds were studied using a “sandwich” structure consisting of GG17 glass and A7N01P-T4 aluminum alloy. The types and morphology of pores were analyzed using scanning electron microscopy and an x-ray nondestructive tester. The experimental results indicated that the droplet transfer mode affected the stability of the keyholes. The barrier effect of the large droplets on the laser could cause the bottom of the keyholes to close, forming keyhole-induced pores in the molten pool. The size of the droplet decreased with increasing wire feeding speed; thus, the selection of an appropriate wire feeding speed in laser-pulsed MIG hybrid welding could reduce the barrier effect and effectively reduce the formation of processing pores in the welding seam.

中文翻译：

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熔滴转移对A7N01P铝合金激光脉冲金属惰性气体复合焊气孔形成的影响

研究了焊接参数对 A7N01P-T4 铝合金激光脉冲金属惰性气体 (MIG) 复合焊气孔形成的影响。使用由 GG17 玻璃和 A7N01P-T4 铝合金组成的“三明治”结构研究了不同送丝速度下小孔的形成和动态行为。使用扫描电子显微镜和 X 射线无损检测仪分析孔隙的类型和形态。实验结果表明，液滴传输模式影响了小孔的稳定性。大液滴对激光的阻挡作用可能导致锁孔底部闭合，在熔池中形成锁孔诱导孔。液滴尺寸随着送丝速度的增加而减小；因此，激光脉冲MIG复合焊中选择合适的送丝速度可以降低阻隔效应，有效减少焊缝加工气孔的形成。焊接参数对激光脉冲金属惰性气体气孔形成的影响（研究了 A7N01P-T4 铝合金的 MIG) 复合焊接。使用由 GG17 玻璃和 A7N01P-T4 铝合金组成的“三明治”结构研究了不同送丝速度下小孔的形成和动态行为。使用扫描电子显微镜和 X 射线无损检测仪分析孔隙的类型和形态。实验结果表明，液滴传输模式影响了小孔的稳定性。大液滴对激光的阻挡作用可能导致锁孔底部关闭，在熔池中形成小孔诱发的孔隙。液滴尺寸随着送丝速度的增加而减小；因此，在激光脉冲MIG复合焊中选择合适的送丝速度可以降低阻隔效应，有效减少焊缝加工气孔的形成。