Welding of HDPE pipes by own hands

Types of pipe connections

1. Mechanical - these connections are made using special parts that connect the pipes to each other. Fittings have remarkable technical characteristics, they are reliable, easy to assemble, have a variety of shapes and sizes.
2. Welded connections - provide connection of plastic pipelines when it is required to maintain the flexibility of the system, but not to let it lose its strength. At the same time, both trench casing and trenchless installation are allowed. The most commonly used are welding into joints and using an electric coupling.

Technique for connecting plastic pipes by welding

Butt welding - is used for pipe diameters of more than 50 mm, whose walls are thicker than 5 mm. The joining unit is formed by heating the edges of the pipes. Upon contact with the heater, the material melts and combines the prepared ends, a very strong weld seam is formed by diffusion and molecular interaction of the substance.

Butt welding instruction:

• The
• pipes are placed in the welding device. The special plate is heated and installed between the edges of the
• pipes. Under certain pressure, combine the pipes to be connected to the
• heater. Wait until the specified time in the instructions before the melting stage of the
• material. Then,edges
• The heater is removed, the pipelines are connected under pressure to each other
• Leave the knot in rest until the mater is solidifiediała

Welding works are carried out by different types of units - with mechanical and hydraulic drives, as well as fully automated.

Butt welding of HDPE pipes with their own hands is characterized by such positive qualities:

• High quality and strength of joints is ensured by the absence of anthropogenic component.
• All welding operations are fully automated, each manufacturer gives a quality guarantee.
• Welding operations take into account the sizes of the pipelines to be connected, the time taken to create the weld and other controlled parameters.

Muff welding - is more often used for connection of pipelines in drainage and sewerage networks. For the implementation of this connection, special connecting parts are used - electric welded fittings, which are suitable for pipes of various diameters with walls of any thickness.

Before starting welding, you need:

• Pre-select the location of work and localization of tools, prepare the welding machine for the process.
• Taking into account the peculiarities of pipelines and electric welded fittings, the welding conditions for a particular situation are selected.
• The internal surface of the parts requires thorough cleaning.
  

  To clean the fittings efficiently and qualitatively, a clean cloth flap must be soaked in alcohol-containing material and degreased.

• Pipe edges are cut and prepared for welding
• Chip( or any type of mechanical cleaning) 0.2 mm thick is removed from the outer surfaces of the pipe to ensure removal of the oxidized layer
  

  If secondary contamination of the joined elements occurs after mechanical cleaning, it is necessary to repeat their degreasing.

• Piping installed in the positioner and centering
• The welded unit is protected against contamination with adhesive tape
• Welding of the HDPE pipes with their own hands is carried out by connecting the electric heaters to the

fittings. Free plugs are fitted with plugs to avoid heat loss.

Inspection of welded joints

In order for the system to be operated efficiently and to be reliable, it is necessary to check the quality of welded joints. After the welding of the HDPE pipes by oneself, the seams must meet the following requirements:

• According to the rules, joints at the pipeline joints are higher than the surface level of the
• pipes. The parts must be displaced relative to each other by less than 10 percent of the wall thickness
• The rollers formed in the welded joint are specified in thickness as follows:

If the process is carried out in accordance with all the above recommendations and the weld meets all the requirements described above,mnevatsya that during operation of the pipeline system will be long and the work of the system - a reliable and effective.