hot melt docking The hot melt butt joint is a method in […]
hot melt docking
The hot melt butt joint is a method in which the polyethylene pipe end interface is heated and melted by a heating plate and then butted and fused to each other and cooled and fixedly connected together. A hot melt electric welder is usually used to heat the end pipe, melt it, quickly attach it, maintain a certain pressure, and cool to achieve the purpose of welding. Polyethylene pipes of various sizes can be connected by hot melt bonding. However, it is recommended to use a capacitor connection for pipes with a nominal diameter of less than 63 mm. The method is economical and reliable, and its interface has higher strength than the pipe itself during tension and pressure.
Ready to work. The butt pipe sections shall be of uniform pipe type, and the same plant supporting materials shall be used as far as possible; the outer diameter and wall thickness of the butt pipe sections shall be the same; the inner and outer surfaces of the welded pipe and pipe fittings, especially near the port, shall be smooth and flat without any abnormality; the size of the pipe Deviation should meet the requirements; the butt pipe section should have good processing and welding performance matched with the welder; check the welding system and power supply matching, clean the heating plate, turn on the power of each part of the welder, and should have grounding protection According to the welding process parameters given by the welding machine, set the heating plate temperature to the welding temperature; if it is an automatic welding machine, set the parameters such as heat absorption time and cooling time.
Hot melt docking operation points. When using this method, the equipment only needs hot-melt butt welding machine. The operation points are as follows: place the connecting pipe on the welding fixture and clamp it, then clean the pipe to be connected, mill the joint surface, straighten the two butt joints, so that The amount of misalignment is not more than 10% of the wall thickness. Then put it in a heating plate to heat it. After the heating is completed, the heating plate is taken out. Finally, the two heating surfaces are quickly joined, boosted to the welding pressure and kept under pressure.
hot melt socket connection
The hot melt socket is connected in the hot melt socket connection, and the two end portions of the pipe to be connected are respectively heated and melted at both ends of a thicker joint pipe section, so that each joint requires two hot melt processes.
When the hot melt socket is connected, the pipe port should be chamfered to clean the joint surface. Draw a marking line at the end of the socket, and use a heating tool to simultaneously heat the joint surface of the pipe and the pipe. When DN ≥ 63mm, use the heating tool of the mechanical device, otherwise it is a manual heating tool. Immediately after the heating is completed, the heating tool is withdrawn, and the socket is inserted into the depth of the socket to reach the marking line with a uniform external force, and a uniform flange is formed at the end of the socket.