The aim of the present study is to fabricate a highly wear resistant WC-10Co-4Cr cladding on AISI 304 stainless steel using TIG welding process. The effect of current and speed on the microstructure, hardness, and abrasive wear of the cladding was investigated. Tribological behaviour of the claddings slided against SiC emery paper was examined using pin-on-disc tribometer. FESEM, XRD and EDS spectrums were used to analyse the microstructure of cladding. Different parametric combination of current and speed has been used to produce the variation in heat input during the cladding. Process parameters, such as current and speed influence the solidification time which results in different kind of microstructure. The results revealed that the TIG cladding deposited at low heat input produces a hard and wear resistance cladding. Increase in hardness and wear resistance was attributed to the partially melted WC grains reinforced in CoCr matrix. SEM images showed the formation of wear tracks on the surface of worn out cladding. The wear tracks was formed due to the plastic deformation and extrusion of CoCr matrix. However, the cladding developed at low heat input shows relatively smooth surface with lesser depth of wear tracks.

本研究的目的是使用TIG焊接工艺在AISI 304不锈钢上制造高度耐磨的WC-10Co-4Cr熔覆层。研究了电流和速度对熔覆层的组织，硬度和磨料磨损的影响。使用针盘式摩擦计检查了在SiC砂纸上滑动的覆层的摩擦学行为。用FESEM，XRD和EDS光谱分析了熔覆层的微观结构。已经使用电流和速度的不同参数组合来产生包层期间热输入的变化。工艺参数（例如电流和速度）会影响凝固时间，从而导致不同类型的微观结构。结果表明，在低热输入下沉积的TIG熔覆层产生了坚硬耐磨的熔覆层。硬度和耐磨性的提高归因于在CoCr基体中增强的部分熔化的WC晶粒。SEM图像显示在磨损的包层表面上形成磨损痕迹。磨损轨迹是由于CoCr基体的塑性变形和挤压而形成的。然而，在低热量输入下形成的覆层显示出相对光滑的表面以及较小的磨损深度。