The MCAW with rotating electrode process (MCAW-RE) is a variation of the conventional MCAW (metal-cored arc welding) process, where reduced costs and superior productivity are obtained due to narrow gap welding, since the rotational motion of the electrode allows the electric arc to reach peripheral regions of the groove, preventing lack of fusion on the sidewall. Although there is some information about the operational characteristics of this process, the literature studying the mechanical properties is very limited. This work evaluates the mechanical and microstructural properties of high strength steel weld metals obtained by the MCAW-RE using two different mixtures of Ar-CO₂ as shielding gas. Multipass welding by MCAW-RE was performed with preheating of 100 °C, in 500 × 150 × 10 mm steel plates. Weld metals were obtained by the MCAW-RE process using a consumable of the class 700 MPa and two mixtures of Ar-CO₂ (5% CO₂ and 25% CO₂) as shielding gas. The results obtained from mechanical tests (hardness and impact Charpy-V) and metallographic examination (optical microscopy, scanning electron microscopy, and electron backscattering diffraction) carried out in samples removed transversally to the weld bead showed equivalent results for all weld metals. These results evidenced that the MCAW-RE process can provide weld metals with satisfactory behavior with different shielding gases. This process has a high potential for replacement of the conventional GMAW process because the weld metals achieved the requirements for several industrial applications.

带有旋转电极工艺的 MCAW (MCAW-RE) 是传统 MCAW（金属芯弧焊）工艺的一种变体，由于窄间隙焊接可降低成本并提高生产率，因为电极的旋转运动允许电弧到达凹槽的外围区域，防止侧壁未熔合。尽管有一些关于该过程操作特性的信息，但研究机械性能的文献非常有限。这项工作评估了使用两种不同的 Ar-CO ₂混合物通过 MCAW-RE 获得的高强度钢焊缝金属的机械和显微结构性能作为保护气体。通过 MCAW-RE 在 500 × 150 × 10 mm 钢板上进行多道焊接，预热温度为 100 °C。焊缝金属是通过 MCAW-RE 工艺获得的，使用 700 MPa 级的消耗品和两种 Ar-CO ₂混合物（5% CO ₂和 25% CO ₂) 作为保护气体。从机械测试（硬度和冲击夏比-V）和金相检查（光学显微镜、扫描电子显微镜和电子背散射衍射）中获得的结果，在沿焊道横向取出的样品中获得的结果显示了所有焊缝金属的等效结果。这些结果证明 MCAW-RE 工艺可以为焊接金属提供具有不同保护气体的令人满意的行为。该工艺具有替代传统 GMAW 工艺的巨大潜力，因为焊接金属达到了多种工业应用的要求。