The poly fusion machine or hdpe fusion machine is applied to weld hdpe pipe both in the water and gas supplier, and from pp and PVDF for the chemical industries and minerals industry. The pipes are put into the clamps of poly fusion machine or hdpe fusion machine and checked for initial alignment. The two hdpe pipes’ ends are then cut to make sure that they are clean and flat. The end of alignment for the hdpe tubes is rechecked. The welding sequence begins when a heating plate, at a preset temperature, is positioned between the two pipe ends. The pipes are pushed together with each other until the pipes’ ends come into contact with the hot plate and the pressure is increased to give good thermal contact. The pipe ends melt and the interface pressure forces the molten material outwards to form ‘weld beads’ at the outside and inside pipe surfaces; hence the term ‘bead-up’ stage. At the end of this stage, the pressure is reduced to a value sufficient only to maintain the pipe in contact with the hot plate. This allows the melt depth to increase without increasing the size of the weld beads. At the end of this ‘heat soak’ stage, the pipe ends are pulled away from the hot plate. The heating plate is removed, and the two fused pipe ends are pushed together at the same pressure as used during the initial bead-up stage. This causes further growth of the weld bead and is called the ‘bead roll over’ stage. The power is maintained until the welding procedure is completely cooled down.Poly Fusion machine or hdpe fusion machine for welding thermoplastic pipes can be carried out on a wide range of pipe sizes, absolutely between 63 and 1600mm DN. Manually, automatically and semi-automatically poly fusion machine or hdpe fusion machine is available commercially from Fine PolyFusion Co., Ltd..
