Specification for Electric Fusion Welding Connection

1.Operation process

1. The electric melting pipe fittings should be protected and packaged until they are ready for use. Before starting welding, the inner surface of the pipe fittings should be kept dry and clean.
2. Scrape the surface oxide layer on the welded end of the pipe. Use appropriate tools such as manual or mechanical scrapers for this operation. When scraping, the entire outer circumference of the end of the pipe or socket fitting should be scraped. When using saddle shaped or saddle shaped tees, the welding area should be scraped.
3. When using a plastic pipe cutter or a fine - tooth saw with a cutting guide device to cut the pipe, it is necessary to ensure that its end face is perpendicular to the pipe axis. Use a small knife to remove burrs from the inner and outer edges.
4. To ensure that the insertion depth meets the requirements, methods such as marking the insertion depth can be used to solve the problem, and the insertion depth is the same as the socket depth of the pipe fitting.
5. Clean the welding area and remove the oxide layer from the pipe or socket end area.
6. Insert the pipe or socket fitting into the socket area of the electrofusion fitting, check the insertion depth marking line on the pipe or socket fitting to ensure it is completely in place, and use an alignment fixture to ensure the accuracy of the pipe or fitting Concentricity, and preventing the pipe from being moved outward due to molten material pressure during the welding process.
7. Pay close attention to the welding progress during the welding process, maintain appropriate distance between personnel, equipment, and welding parts, and prevent accidents caused by improper operations from affecting personnel and equipment Damage to.

2.Factors affecting the quality of electric fusion connection interfaces

1. The Influence of Voltage Fluctuation on Interface QualityThe resistance value of the resistance wire inside the given electric fusion pipe fitting is fixed, therefore, the heating power of the resistance wire completely depends on the voltage provided by the power supply, so the quality of the welding junction will deteriorate due to voltage fluctuations affecting the heating power.
2. The influence of fusion time on the interfaceThe required heat range for each specification of electric fusion pipe fittings is fixed, and excessive or insufficient heat will have a fatal impact on welding quality. However, under the premise of fixed welding voltage and pipe resistance,Welding time is the only determining factor for the heat generation of pipe fittings, therefore it is necessary to accurately control the welding time.
3. The Influence of Environmental Temperature on Interface Quality The changes in environmental temperature during the welding process directly affect the heat transfer conditions in the fusion zone, thereby affecting the quality of fusion. Therefore, the welding machine must be able to monitor the environmental temperature and automatically based on the deviation results Adjust the output parameters accordingly.
4. The impact of poor operation on the quality of fusion jointsThe so - called bad operation, on the one hand, refers to the cleaning or scraping of pipes during welding that do not meet the requirements Standardize (especially if the socket is not properly assembled, and there is a large inclination at the end of the socket),This requires the operator to have a certain level of welding knowledge. On the other hand, input melting Errors that occur when connecting parameters should be avoided through the settings of the welding machine itself.

3.Special precautions during construction

1. When cutting pipes, the end face must be perpendicular to the axis of the pipe and there must be no inclined edges.
2. Before inserting the pipe, the inner and outer surfaces of the pipe and fittings must be cleaned,It must not contain any impurities such as sediment or water.
3. Before inserting the pipe, the oxide layer on the surface of the pipe and socket fittings should be scraped off,When scraping, the area to be scraped should be measured along the entire circumference of the pipe or socket fittingEvenly scrape.
4. The pipe must be inserted in place and kept parallel to the pipe fitting to ensureThe insertion of storage materials should be done in place, and the insertion depth mark should be made at the socket end.
5. When welding, a matching electric fusion welding machine (AC voltage 39.5V) should be used.
6. Reasonably control the scraping amount of the oxide layer at the socket end, and strictly prohibit excessive tapping with heavy objectsAssembly.
7. When welding pipe fittings of D110 and above, fastening fixtures should be used at both ends of the pipe,Ensure that the pipe material moves outward under the pressure of the molten material during the welding process.