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PE Pipe Electrofusion Welding Technology And Precautions
May 17, 2018

In general, the pe pipe hot melt connection is suitable for pe pipes with pipe diameter >= dn63. The method is to weld the pipe with a hot melt machine, which is fast and low cost. It is suitable for the related hot melt welding of pe water supply pipe and pe gas pipe. The methods and methods of attention are as follows:

The pe pipe electrofusion welding is the hot melt connection method of the polyethylene pipe system with hot melt butt joint (including saddle connection) and hot melt socket connection. The hot melt socket connection is suitable for pipe fittings with a relatively small diameter (generally the diameter is below DN 63 mm), because the pipe wall with a smaller diameter pipe has a thinner wall and a smaller cross section, and it is difficult to ensure the quality by using a butt joint. Hot-melt butt joints are suitable for large-diameter pipe fittings, which are less expensive than socket joints and are easy to manufacture. Because the oxide surface layer is cut off before welding, the welding pressure can be controlled and the quality can be easily ensured. From the perspective of development, the use of hot-melt welding is the mainstream.

 

Tests have shown that the use of different grades of polyethylene pipe special materials (in accordance with the standard, melt flow rate MFR is not much difference) between the production of pipe fittings can be hot melt connection. However, because the materials commonly used in domestic production of polyethylene pipe fittings do not fully comply with the standard pipe special materials, it is recommended that they be tested and tested first when hot-melt connection of polyethylene pipe fittings with different brands and batch numbers is required.

Hot melt equipment - hot melt machine. The process and equipment (tools) for the hot melt connection of polyethylene piping systems are relatively simple. In recent years, there have been a lot of problems in connection with laying polyethylene pipes. The difficulty is that the quality of the hot melt connection is difficult to detect on site (without breaking the connection). In foreign countries, the use of ultrasonic testing for the quality of hot-melt connections has been explored, but the use of the site has not yet been popularized. At present, it is generally on the scene that it depends on 'visual inspection'. The guarantee of stable quality of the hot melt connection is mainly based on strict observance of the prescribed operating procedures (especially strict control over temperature, pressure and time parameters). It is recommended that polyethylene pipe fittings production companies develop more detailed operating procedures suitable for the company's pipe fittings according to relevant regulations (regulations of the comparison principle) through tests and tests (combined with the characteristics of the hot melt connection equipment used). And through training and consulting to help constructors master operating procedures. The large companies that produce polyethylene piping systems internationally have these guidelines for the operation of hot melt connections. A practical approach to quality control is described in the U.S. PPI Handbook: A test hot melt connection is made at the site every day for 'bend test' (no destructive testing of the equipment is required) to determine if the process and equipment need to be adjusted .

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