Abstarct: One of the surface hardening methods of steels is surface alloying by melting processes and creating composite laxyers using tungsten arc welding under argon shielding gas. In this research, the surface alloying of AISI 1045 steel was done by tungsten arc and argon shielding gas (GTAW) and the addition of silicon carbide powder, and its effect on the mechanical properties of the surface was also investigated. The alloyed surface was examined by optical microscope (OM), scanning electron microscope (SEM) and X-ray diffractometry, and elemental analysis was taken from its different parts. Then, the alloyed areas were subjected to microhardness testing by microvickers method. Surface melting and alloying resulted in the creation of a coating laxyer containing carbon masses, sulphide compounds and silicon, which caused a significant effect in increasing the hardness and wear resistance of the surface. These particles that are distributed among the dendrites in the form of deposits. On the other hand, due to the reduction of input heat and the reduction of iron dilution in the coating, the hardness of the coating increased. Dilution of iron in the coating reduces hardness and wear resistance. The wear test also showed that this laxyer has a much higher wear resistance than the original steel, and with the increase in the percentage of silicon carbide powder, the wear products decreased and in other words, the wear resistance of the samples increased. Also, with the increase in the amount of alloying elements in the molten pool, the surface hardness showed a further increase. The surface laxyers resulting from the surface composite process by increasing the percentage of silicon carbide caused the heat transfer from the composite laxyers to occur later and the penetration of undesirable elements to occur less.