Evaluation of Microstructure and Wear Resistance of Stellite6/Tungsten Carbide Cladding by Pulse Current Gas Tungsten Arc Welding The main behaviour of this research is the study on microstructure, hardness, dilution, phase formation, wear behaviour, fracture toughness and bending strength of stellite6 composite cladding on carbon steel with and without reinforcement in two pulsating and continuous current mode. Mixtures of Stellite6 alloy powders and 10%, 20%, 30% and 40% tungsten carbide (WC) powders were used as the coating materials. The process of welding was gas tungsten arc welding (GTAW). The microstructures of these coating were studied by optical microscopy, scanning electron microscopy (SEM) and X-Ray Diffraction(XRD). The specimens were characterized by ene rgy dispersion spectroscopy (EDS) and micro hardness test and for bending strength, a three point bending machine was used. Wear tests were carried out using pin-on-disk method. The worn surfaces were examined by scanning electron microscopy. Results showed that the micro structures of these claddings include chromium carbides phases dispersed in the matrix of the Co-based alloy with dendritic structure. The hardness of specimen with 40% tungsten carbide (WC) and claded in pulsating mode was higher than other specimens. The surface hardness of specimen with 40% tungsten carbide (WC) was near 600 HV. The dominant mechanism of wear test was abrasive with some adhesive wear. The weight loss of the specimen with increase in weight fraction of reinforcement decrease. Coefficient of friction for satellite without tungsten carbide (WC) was measured betwee 0.2-.28. Use of pulsating current mode decreased the dilution of iron because of decrease in the amount of heat input. Toughness of stellite6 withoute reinforcement was higher than other specimens. The added tungsten carbide (WC) was completely melted into the weld pool and the resolidified structure contained ?-Co, ?-CoCr and some types of carbides. It was indicated that the use of pulsed current leads to a decrease in dilution and formation of a finer microstructure having higher hardness. Several significantly different solidified microstructures were characterized by dendrites, eutectics and faceted dendrites in the claddings. The faceted dendrites contained the majority of W as well as Cr and Co while the matrix had higher Cr and Co content. The presence of faceted dendrites caused improvement in wear behavior of claddings, with more tungsten carbide (WC) content introduced, more faceted dendrites was obtained. This study highlights the experimental study carried out to develop mathematical models to predict dendrite arm spacing and hardness of the cladding overlay.