It is a bottleneck in the construction of PE pipeline to melt and connect the welded joints of polyethylene (PE) pipes. The hot melt connection as an example, the current detection method is to visually weld welding ring appearance to test its quality, although some problems can be found by ring welding appearance, but some inherent problems cannot be reflected from the surface, such as "false welding", "false welding" with the appearance of qualified appearance but not much difference between. The long-term strength can not be guaranteed, other pipeline construction damage of the gas pipeline gas pipeline foundation, the imbalance in the external force, extrusion cracking caused by major accidents.
In welding connection, only the final fused fittings on the top and observe whether or not to judge the quality of welding is not completely is not the exact hole, the observation hole only as a basis to judge the effect of welding, electric fusion welded joint the final quality mainly depends on the control in the process of operation strictly. Therefore, it is of great significance to study the quality and quality of polyethylene (PE) pressure pipe joint in order to ensure the quality of the project
PE pipeline construction, although the operation is simple and easy to grasp, but whether the hot melt connection and electric melt connection operation process must be strictly controlled operation steps, operation process is controlled, rather than relying on the final single to weld on the joint quality of qualified judges. With hot melt welding as an example, temperature, pressure and time are the three most important factors in the welding process, due to the influence of PE pipe hot melt is very vulnerable to environmental changes and human factors of welding, there is no fixed value are unified in the world, but in some countries are using the PE pipeline earlier formed a calculation method a set of more perfect and mature operation rules and parameters, and in the construction of many PE pipeline project in China, three important factors set by the general polyethylene (PE) production enterprises, so there are great differences.
In addition, in many places, construction workers barbaric construction of quality accidents also happen. Although the temperature, time and pressure are three important factors, but the whole process of other details are often overlooked. For example, to be welded end milling, how to maintain the cooling process and end time cleaning and final weld details, these problems may not be ignored from the end of the welding performance, but can not guarantee the inherent properties of weld. Therefore, the correct and effective implementation of welding procedures and procedures is critical and closely related to the stability of welding equipment and the responsibility of operators. In welding connection, it is not enough to guarantee the electric melting pipe transport and discharge voltage stability and welding time accurately, and weld preparations such as welding pipe surface is clean, such as the existence of impurities, eventually melt effects are affected.
The scraping of the oxide layer, without scraping or scraping is not enough. It is likely to cause the failure of welding one hundred percent. The assembly of the fused tube and the pipe or pipe to be welded will also affect the quality of the final welding. In addition, before welding, whether the storage condition of the fused pipe meets the standard and the proper cooling process after welding are the factors that affect the final welding quality. The specification and the necessary supporting construction technology in the country is lagging behind in the development of PE pipe application speed, which restricts the popularization and application of PE pipe. Therefore, it is an effective way to make professional construction of engineering technicians and construction personnel, and gradually realize the certificate holder appointment to make PE pipeline construction go to regular and good development
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