The principle of polyethylene wire mesh composite pipe welding is to use an electric fusion welder to heat the electric wire embedded in the inner wall of the electric fusion pipe fitting, and the heating energy will melt the connecting sheet between the pipe fitting and the pipe. After the gap on both sides of the pipe is closed, the molecular chain segments of the molten material in the sheet melting zone will diffuse with each other under the influence of high temperature and high pressure. When the mutual spreading depth on the interface reaches the specification required by the chain entanglement, the sheet can be obtained after natural cooling. Necessary welding strength produces reliable welding connection of pipe joints.
According to the principle of electric fusion welding and practical experience at home and abroad, it has been proved that whether reliable pipeline welding connection can be generated depends mainly on the design of electric fusion pipe fittings, temperature resistance characteristics, stability of electric fusion welding machine and power supply voltage provided by pipe fittings. Material properties of pipes and tubes, pretreatment of pipe and tube interface, total width and uniformity of pipe and tube gap, alignment and clamping stability of pipes and tubes, welding process parameters (such as voltage, current, time, etc.), working temperature during welding, level of operators, etc. Therefore, the product standards, process parameters, operation specifications, quality inspection and test methods, etc. prepared according to the principle of electric fusion welding, as well as the practical experience of factors affecting the responsibility of welding quality, are the consensus of all parties involved in production, application and management. At the current stage of development in China. And guidelines.
In the composition of polyethylene pipeline system, double-layer electric melting pipe fittings are an indispensable part, and the selected electric melting pipe fittings must conform to the corresponding commodity standards, Electric melting pipe fittings used in the gas pipeline system must comply with the specification for polyethylene pipe fittings for gas: GB15558.2-2005; Polyethylene electrofusion pipe fittings for water supply must conform to the specification of polyethylene pipe fittings for water supply: GB/T13663.2-2005.
Polyethylene blending seasoning used by the manufacturer of electric melting pipe fittings must meet the requirements of its product standards for PE raw materials.
The quality of PE mixed seasoning has a decisive influence on the long-term characteristics of electric melting pipe fittings. Therefore, the selection of special materials is the basis for ensuring the quality of polyethylene electric melting pipe fittings. If the materials used by the manufacturer of electric melting pipe fittings do not meet the requirements of the raw material product standards, no matter how good the equipment is or how advanced the technology is, it is impossible to produce qualified products at the current level.
