Abstract: The effect of the mixed He-Ar gas ratio on the quantity and morphology of Fe content in TIG surfacing of coppersteel was studied and the relationship was obtained, by adjusting the He-Ar gas ratio which can affect the according arc morphology and arc pressure.The results show that the amount of heat input increase with the increase of He content in appropriate welding parameters, while the arc pressure decrease first and increase later.Moreover the morphology of Fe content is different in different He-Ar gas ratio. In addition, the amount of heat input, arc morphology and arc pressure can be controlled by adjusting the He-Ar gas ratio.Consequently, the quantity and morphology of steel can be controlled strictly.