The TIPTIG welding method was used to weld the STKM13B carbon steel pipe with the outer diameter of 186 mm and the wall thickness of 12 mm. In this paper,the welding joints were tested by tensile strength,bent,impacted and microhardness. The results show that the TIPTIG welding method can achieve the high quality welding of STKM13B steel pipe. The impact absorption energy of the weld center and the heat-affected zone is 110 J and 49 J,respectively. The microhardness of the weld center and the heat-affected zone on both sides of the weld center is the highest,and gradually decreases with the increase of the distance from the weld center until the hardness of the substrate is reached. The joint performance is not lower than the standard requirements of the parent metal.