Welding method for plastic pipes
With the expansion of the application of plastic pipes, […]
With the expansion of the application of plastic pipes, the types of plastic pipes have continued to increase. Now in addition to general PVC and polyethylene pipes, there are: PVC core foamed pipes, PVC, PE double-wall corrugated pipes, aluminum-plastic composite pipes, PE pipe, plastic steel composite pipe, polyethylene silicon core pipe, etc.
Plastic pipe connection methods include: mechanical connection, hot-melt socket welding, hot-melt butt welding, spot welding. Among them, hot-melt butt welding and spot welding are the main connection methods for plastic pipes.
Hot melt welding
The hot melt welding machine uses the inner and outer surfaces of the heated object to heat the corresponding outer and inner surfaces of the welded plastic pipe and pipe when it is being welded, so that it melts, quickly pulls out the heated object, and then the pipe Quickly pierce the pipe, apply a certain amount of force, and reach the intention of welding after cooling. General hot melt acceptance welding is suitable for projects with a diameter of less than 125mm.
Hot melt welding
The hot-melt butt welding is to use a hot-melt butt welder to heat the welding end face of two pipes (which must be cleaned or milled before welding) to a certain temperature, when it melts, then quickly attach it and apply a certain pressure until Cool so that the two pipes are welded together.
According to the contact method of the welding machine heating plate and the pipe being welded, it can be divided into two methods: contact heating and infrared radiation heating. When welding in accordance with the appropriate process, the tensile strength and pressure resistance of the Hankou area are appropriate or stronger than the pipe itself. Hot melt butt welding is suitable for welding of plastic pipes with a diameter greater than 90mm. It should be noted that during the welding process to sufficient cooling, it must withstand external impacts, and it is not possible to use any method for forced cooling.
Electric fusion welding machine
The electric welding machine for plastic pipes is welded by using electric wires on the inside and outside of the fused pipe to heat the inside and outside of the pipe and the appearance of the pipe. The thermal expansion effect of the plastic pipe makes the plastic pipe and its connecting parts. Blend together and then cool to the required moment to reach the intention of welding.
Before welding, the welding area must be cleaned or scraped. The oxide layer is mainly removed from 0.1 to 0.3 mm. According to the raw materials, suitable welding parameters are selected, that is, the heating time and heating voltage or current are controlled to ensure that the temperature and pressure of the molten plastic reach appropriate values. , And then get high-quality plastic welded joints.
