How long does it take for the HDPE pipe welding machine to fuse
This is done using a heating tool that heats the ends o […]
This is done using a heating tool that heats the ends of both pipes at the same time. These heating tools are usually equipped with a thermometer to measure the temperature of the internal heater, so the operator can monitor the temperature before making each joint. However, this thermometer can only be used as a general indicator, because depending on factors such as ambient temperature and wind conditions, there will be some heat loss from the inner surface to the outer surface. Before the first joint of the day, a pyrometer or other surface temperature measuring device should be used and used regularly throughout the day to ensure that the temperature of the heating tool surface in contact with the end of the pipe or fitting is appropriate. In addition, heating tools are usually equipped with hanging and alignment guides that can be centered at the end of the pipe. The manufacturer of the melting equipment recommends that the surface of the heater in contact with the pipeline should be clean, oil-free, coated with a non-stick coating or covered with a non-stick fabric to prevent the molten plastic from adhering to the surface of the heater. The remaining molten plastic will affect the quality of the melt and must be removed according to the tool manufacturer's instructions. Never use chemical cleaners or solvents to clean the surface of heating tools.
The surface temperature must be within the temperature range of 400-450 ° F (204-232 ° C). Install the heater in the butt welding machine, and make the tube end fully contact with the heater under the welding pressure to ensure sufficient and proper contact between the tube end and the heater. After maintaining the pressure briefly, the pressure should be released without breaking the contact. On larger sized pipes, the melting pressure must be maintained until slight melting is observed around the pipe before the pressure is released. Continue to keep the components in contact with each other without contact, while forming molten polyethylene beads between the heater and the tube end. It is recommended to keep at least 4.5 minutes per inch of pipe wall as the shortest holding time. Then continue the heating cycle until the smallest bead size is formed on both sides of the heater (see table).