The laser-MAG hybrid welding in horizontal-vertical (PC) position was used to study the effect of different groove types on the quality of a root weld. Six combinations of bevel angles (50° + 0° (represents the groove angle of upper plate and lower plate respectively), 45° + 5°, 40° + 10°, 35° + 15°, 30° + 20°, and 25° + 25°) and root face sizes of 2 to 4 mm were designed. Hannover analyzer was used to collect electrical signals to analyze the stability of the horizontal-vertical position welding process. The results show that different combinations of groove angle have achieved one-sided welding with root formation. The groove angle has an obvious effect on the weld inclination and molten weld metal flowing down. The combination of bevel angles in which that of the lower plate is smaller than that of the upper plate was more conducive to avoid welding defects such as weld inclination and molten weld metal flowing down. The best groove angle combination was 30° + 20°, which allowed one-sided welding with root formation using a 4-mm root face.

水平-垂直 (PC) 位置的激光 MAG 复合焊接用于研究不同坡口类型对根部焊缝质量的影响。六种斜角组合（50°+0°（分别代表上板和下板的槽角）、45°+5°、40°+10°、35°+15°、30°+20°、 25° + 25°) 和根面尺寸为 2 至 4 毫米。汉诺威分析仪用于采集电信号以分析水平-垂直位置焊接过程的稳定性。结果表明，不同坡口角度组合实现了单面焊根部形成。坡口角度对焊缝倾斜和熔化的焊缝金属向下流动有明显的影响。下板斜角小于上板斜角的组合更有利于避免焊缝倾斜、焊缝金属向下流等焊接缺陷。最佳坡口角度组合为 30° + 20°，这允许使用 4 毫米根面形成根部进行单面焊接。