PPR pipe fittings why will occur at the connection burst

PPR pipe fittings why will occur at the connection burst
Hot melt method can be used to connect the PPR pipe fittings, but sometimes in the connection will happen burst because of what? Below small make up for everybody to introduce:
First, it may be the temperature of the hot melt welding machine is not correct, too high or too low, so that changes in the performance of polypropylene. Second, the size of the welded sleeve is incorrect, so that the melting depth and the welding structure of the pipe are not appropriate. Third, the surface of welding set has not dealt with, or surface coating, the contact part of the pipe with hole. Fourth, welded pipes and tubes do not maintain concentric or straight line.
Above is for the PPR pipe connection of the cause of the explosion, I hope you can understand these knowledge.

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