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螺旋焊管为了防锈，出厂前在其外表面要涂一层沥青漆。原有喷涂机用低压油泵作动力，将经汽油稀释后的沥青漆加压，经小孔呈伞形喷洒到沿辊道直线行走的钢管上。现机组钢管输送方式由原来的直线输送改为螺旋输送，喷涂机采用全自动控制，喷枪由原来的环形多喷嘴改为现在的单喷嘴喷枪，喷涂时漆面轨迹同钢管螺旋成型方式相似。主机采用压缩空气作动力，沥青漆经自动喷枪上特制孔形的喷嘴喷出，呈雾状直接喷射到钢管表面，涂层薄厚均匀，涂料与钢管的附着力大，提高了钢管的防锈能力。
Spiral welded pipe in order to rust, the factory before its outer surface to be coated with a layer of asphalt paint. The original sprayer with low-pressure pump as a motive force, will be diluted with gasoline paint asphalt pressure, through the small hole was sprayed umbrella to walk along the roller straight pipe. The current unit of steel pipe delivery from the original straight conveyor to screw conveyor, spraying machine with automatic control, spray gun from the original multi-ring nozzle to the current single-nozzle spray gun, spray paint when the trajectory with the pipe spiral molding similar. The host uses compressed air as the driving force. Asphalt paint is sprayed by a special hole-shaped nozzle on the automatic spray gun. It is sprayed directly on the surface of the steel pipe in the form of mist. The coating has a uniform thickness and a large coating and steel pipe adhesion, .