Although overlay coatings deposited via plasma transferred arc welding (PTAW) can effectively prolong the service life and improve the performance of components, cracks and pores tend to occur in the high-hardness and wear-resistant coating during the deposition process. Further treatment is thus necessary to improve the coating quality. Herein, PTAW-deposited Ni-based overlay coating was remelted using plasma transferred arc (PTA) under different remelting currents (RCs). The microstructure and phase composition of the coatings were investigated via metallographic microscopy and x-ray diffraction. The hardness, surface quality, and wear resistance of the coatings were also tested. The results show that PTA remelting could effectively eliminate the defects and improve the coating properties when the RC was controlled within a given interval (100-120 A). The type and content of the hard phase in the remelted coating were increased to enhance the microhardness and wear resistance. However, remelting with excessive currents resulted in the agglomeration and growth of the hard phases, which negatively affected the coating hardness and wear resistance. The proper use of PTA remelting technology to treat PTAW-deposited overlay coating is an effective approach for eliminating the coating defects and enhancing the coating properties.

尽管通过等离子转移弧焊（PTAW）沉积的覆盖涂层可以有效地延长使用寿命并改善组件的性能，但是在沉积过程中，高硬度和耐磨涂层中往往会出现裂纹和气孔。因此需要进一步处理以改善涂层质量。在此，使用等离子体转移电弧（PTA）在不同的重熔电流（RC）下重熔PTAW沉积的Ni基覆盖涂层。通过金相显微镜和X射线衍射研究了涂层的微观结构和相组成。还测试了涂层的硬度，表面质量和耐磨性。结果表明，将RC控制在给定的时间间隔（100-120 A）内，PTA重熔可以有效消除缺陷并改善涂层性能。增加了重熔涂层中硬相的类型和含量，以提高显微硬度和耐磨性。然而，用过量的电流重熔导致硬质相的附聚和生长，这不利地影响了涂层的硬度和耐磨性。正确使用PTA重熔技术来处理PTAW沉积的表面涂层是消除涂层缺陷和增强涂层性能的有效方法。用过量的电流进行重熔会导致硬相的团聚和生长，从而对涂层的硬度和耐磨性产生负面影响。正确使用PTA重熔技术来处理PTAW沉积的表面涂层是消除涂层缺陷和增强涂层性能的有效方法。用过量的电流进行重熔会导致硬相的团聚和生长，从而对涂层的硬度和耐磨性产生负面影响。正确使用PTA重熔技术来处理PTAW沉积的表面涂层是消除涂层缺陷和增强涂层性能的有效方法。