1. When the PE pipe is welded, it is necessary to align the axes of the two pipes, and then fix the ends of the two pipes by welding. At the same time, before welding with the flange, the feed pipe must be pierced into the inside of the flange, and after spot welding, it needs to be aligned with a square, and then welded. At the same time, for the flange, it needs to be welded on both sides, and its inner welding cannot exceed the closed surface of the flange.
2. If the wall thickness of the PE pipe is more than 5mm, the groove should be cut during welding, so as to ensure sufficient penetration. For the forming of the groove, you can choose the cutting method of gas welding or the method of machining the groove. However, before cutting, the slag and iron oxide must be removed first, and then polished with a file until there is a metallic light.
3. When the pipe is cut, its cut surface must be in a straight state with the center line of the pipe, so as to ensure the concentricity of the pipe after welding. In addition, the flange should be straight and on the center line of the pipe during welding, and the outer surfaces should be in a parallel state with each other, and its gasket should not protrude into the pipe. But if it is a connecting flange, its bolt standard should be matched with the flange.
4. When welding to the PE pipe, its interface should be cleaned up, and the rust, dirt and grease should be cleaned up. The cold water system must choose rubber pads, while the hot water system can choose asbestos rubber pads.