This paper aims to study the solidification structure of Ni-based superalloy class AWS ER NiCrMo-4 metallic coatings deposited by GMAW and gas metal arc welding-cold wire (GMAW-CW) processes with two heat input levels (0.9 and 0.6 kJ mm⁻¹) on carbon steel plates. The metallurgical characterization of the coating’s interface was performed by scanning electron microscopy, optical microscopy, and electronic dispersion spectroscopy. Mechanical evaluation was carried out by Vickers hardness test. The results revealed that the welding conditions did not influence the solidification structure (planar, columnar, and equiaxed); however, molybdenum microsegregation to interdendritic region was observed. Cold wire addition by GMAW-CW process decreased the iron dilution on weld metal, but increased the partially mixed zone thickness and hardness values. The increase in heat input produced the opposite behavior to the cold wire feeding.

本文旨在研究两种热输入水平（0.9和0.6 kJ mm mm）的GMAW和气体保护金属电弧焊-冷焊丝（GMAW-CW）工艺沉积的镍基高温合金类AWS ER NiCrMo-4金属涂层的凝固组织^{- 1个}）放在碳钢板上。涂层界面的冶金学特征是通过扫描电子显微镜，光学显微镜和电子分散谱进行的。通过维氏硬度试验进行机械评价。结果表明，焊接条件不影响凝固组织（平面，柱状和等轴）。然而，观察到钼微偏析到树突间区域。通过GMAW-CW工艺添加冷焊丝减少了焊缝金属上的铁稀释，但增加了部分混合区的厚度和硬度值。热输入的增加产生了与冷丝进给相反的行为。