Abstract A high-speed camera system has been used to observe the metal transfer with bead-on-plate welding. A stable pulsed streaming spray transfer was accompanied by arc jumping when the shielding gas of Ar+4%CO2+3%O2 was used, but the change of metal transfer mode had a tight relationship with the bell-shaped arc rather than critical current when a mixture of Ar+13%CO2+3%O2 was as shielding gas. With increasing CO2 concentration in the shielding gas, the bright arc area and arc length decreased due to the compression effect of carbon dioxide. Weld penetration and weld width increased slightly due to the higher arc force. The ferrite content in the weld metal increased slightly with increasing CO2 concentration in the shielding gas.

中文翻译：

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保护气体对碳钢脉冲电流 MAG 焊金属转移和焊缝形貌的影响

摘要 采用高速摄像系统对板珠焊金属转移进行观察。使用Ar+4%CO2+3%O2保护气体时，稳定的脉冲流喷射转移伴随着电弧跳跃，但金属转移模式的变化与钟形电弧而不是临界电流有密切关系。 Ar+13%CO2+3%O2 的混合物作为保护气体。随着保护气体中CO2浓度的增加，由于二氧化碳的压缩作用，亮弧面积和弧长减小。由于较高的电弧力，焊缝熔深和焊缝宽度略有增加。焊缝金属中的铁素体含量随着保护气体中 CO2 浓度的增加而略有增加。