The invention relates to a tubular part welding method and application thereof. The tubular component comprises two to-be-welded parts, wherein ports of the two parts are mutually sleeved; arc welding, electron beam welding or laser welding is adopted during welding, and a wire feeding mode is adopted for welding. During welding, heat is mainly provided for fusion welding wires, and the heat is concentrated, overall furnace welding is not needed, and the heat is also smaller than that required for directly heating the ports of the two to-be-welded tuber parts till self-digestion welding, so that the requirement on the power of equipment is low; meanwhile, the dimensional precision requirements of the two to-be-welded parts are not high, and the requirements of welded surfaces are not high, so that favorable fusion can be realized, and the welding strength and the production efficiency are greatly improved.