The choice of hot melt connection depends mainly on the material grade and density of the plastic pipe. The connection method of plastic pipes should also be based on the relevant provisions of the buried "Polyethylene Water Supply Pipe Engineering Technical Regulations" (GJJ101-2004). Most polyethylene pipes can be joined together using two hot-melt methods. However, some high-density polyethylene pipes cannot be connected by the receiving method. When used in buried heat exchangers, polybutylene is generally a socket connection. Proper joints can be obtained with both types of connection. The proper use of both connection methods results in a strong joint that is stronger than the pipe itself.
It should be noted that due to differences in melting point and service life, different plastics or different grades of plastic should not be welded together.
The visual inspection and "back bend" test methods are mainly used in the construction to test the welding quality.
Visual inspection - observation with the eye. The flanging should be solid and sleek with a wide root. If the root is narrow and there is a curling phenomenon in the middle, it may be due to excessive pressure or too short an endothermic time. The “bend-back” test method is to use the fingers to hold the outside of the flange and bend the flange outward. During the bending process, observe whether there are micro-slit-like defects, if any, that the heating plate may be subtle contamination: If possible, use polyethylene ultrasonic welding butt joints ultrasonic inspection system, according to the characteristics of the inspection and the use of mechanical testing Correlation analysis results, make a judgment on the quality of welding.
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