With the expansion of the application of plastic pipes, the varieties of plastic pipes are also increasing. Now in addition to ordinary PVC and polyethylene pipes, there are also: PVC core foam pipes, PVC, PE double-wall corrugated pipes, aluminum-plastic composite pipes, Cross-linked PE pipe, plastic-steel composite pipe, polyethylene silicon core pipe, etc.

This article briefly introduces the three main methods of connecting plastic pipes: hot-melt socket welding, hot-melt butt welding, and spot welding. Hope it helps you.

Hot melt socket welding

During hot-melt welding, the inner ring surface and the outer ring surface of the heating tool are used to heat the corresponding outer ring surface and inner ring surface of the plastic pipes and fittings to be welded, respectively, to melt them, quickly pull out the heating tool, and then quickly insert the pipe. Pipe fittings, and apply a certain amount of force to achieve the purpose of welding after cooling. Generally, hot melt socket welding is suitable for engineering diameter less than 125mm.

hot melt butt welding

Hot-melt butt welding is to use a hot-melt butt welding machine to heat the welding end faces of two pipes (which must be cleaned or milled before welding) to a certain temperature, when they are melted, they are quickly attached, and a certain pressure is applied until it cools. This welds the two pipes together.

According to the contact method between the welding machine heating plate and the welded pipe, it can be divided into two methods: contact heating and infrared radiation heating. When welded according to the proper process, the tensile force and bearing pressure of the Hankou part are equal to or stronger than the pipe itself. Hot melt butt welding is suitable for welding plastic pipes with a diameter greater than 90mm. It should be noted that it is strictly forbidden to be impacted by external force during the welding process until fully cooled, nor can any method be used for forced cooling.

Electrofusion welding

The electric fusion welding of plastic pipes is to use the electric heating wire on the inner surface of the electric fusion pipe fittings to be heated by electricity, so that the inner surface of the pipe fittings and the outer surface of the pipes are melted. together, and then cooled to the required time to achieve the purpose of welding.

The welding area should also be cleaned or scraped before welding, mainly to remove the oxide layer of 0.1 to 0.3 mm, and appropriate welding parameters should be selected according to the material, that is, the heating time and heating voltage or current should be controlled to ensure that the temperature and pressure of the molten plastic reach appropriate values. , and then obtain high-quality plastic welded joints.

The above is a brief introduction to the main methods of connecting plastic pipes, I hope it can help you.

Supplier of equipment for connecting plastic pipes

DSL FUSION TECHNOLOGY is a Sino-Thai joint venture and has been a leader in the supply of plastic pipe welding machinery for 8 years. The DSL team not only provides high-quality equipment for connecting plastic pipes, but also plastic pipes to provide customers with welding technology, design, training and After-sales service. If you are interested, please visit our website.

DH355(Hydraulic) is our hot-selling product of Hydraulic Butt Fusion Machine series, more details are as follows: