in the installation scene of PE pipe drain pipe, welding is the core step of connecting the pipe. Many users will have such questions: Will welding cause pipe blockage? In fact, the answer is very clear - as long as the operation is standardized, PE pipe welding itself will not cause blockage, but if the details are ignored or the operation is wrong, it may indeed bury the hidden danger of blockage.

4 common reasons for PE pipe blockage caused by welding

To avoid blockage, it is necessary to figure out where the problem is. The blockage caused by PE pipe welding is mostly related to the following four kinds of operation errors:

1. Welding tumor protrusion: "accidental residue" of molten PE material

If the temperature is too high, the heating time is too long, or the butt pressure is too high during welding, the molten PE material will overflow from the interface, and a raised "solder tumor" will be formed after cooling. These weld tumors will protrude from the inner wall of the pipeline, just like the "small soil slope" on the road - when the hair, fibers and sediment in the drainage flow through here, it is easy to get caught and gradually accumulate, and slowly block the pipeline.

2. Welding dislocation: the "invisible step" of the interface

If the pipe is not accurately aligned when docking, even if the appearance looks flat, the interior will appear "step" dislocation. This "invisible step" is the "natural interception point" of debris, especially in the case of slow drainage flow rate, oil, food residue and other viscous debris will slowly stick here, and over time it will become the "source" of blockage.

3. Impurities mixed in: "clean dead ends" before welding

If the interface is not thoroughly cleaned before welding, such as residual dust, pipe debris after cutting, and even oil on the hands, these impurities will be wrapped into the interface during welding. After cooling, they will become hard particles or lumps, directly occupying the pipeline space, and even scratching the flexible debris in the drain (such as toilet paper, cloth), making the blockage come faster.

4. Incomplete welding: Hidden dangers of "surface work"

False welding (the surface is welded but the inside is not fused) or not fully welded (the interface part is not completely melted), can lead to deformation or gap inside the pipeline. Over time, the deformation part may slowly expand, or the accumulation of debris in the gap, eventually blocking the pipeline tightly.

5 key operations to avoid welding blockage

In fact, as long as you do the following points, you can eliminate the blockage caused by welding from the root:

- Thoroughly clean the interface: do not let impurities "drill holes"

Be sure to wipe the interface with a clean rag before welding, if there is oil, clean it with a special cleaner; after cutting the pipeline, remember to scrape off the oxide layer of port 1-2mm with a scraper - the oxide layer not only affects the welding strength, but also may be mixed into the interface to form impurities.

- Precise alignment: do not let the pipeline "crooked"

Fix the pipeline with a counterpart to ensure that there is no misalignment at the interface, and the deviation cannot exceed 10% of the wall thickness of the pipeline. For example, DN110 PE pipe (wall thickness of about 8mm), dislocation can not exceed 0.8mm - this error seems small, but can avoid internal "step".

- control welding parameters: temperature and pressure should be "just"

Adjust equipment parameters according to the specifications of PE pipe: Generally speaking, the welding temperature of PE pipe is between 200-230 ° C, the heating time is calculated according to "wall thickness 10 seconds" (such as 8mm wall thickness heating 80 seconds), the butt pressure should be uniform, to avoid excessive force extrusion of excess PE material.

- Use the right equipment: don't use "simple tools" to make up the number

be sure to use a hot melt butt machine or electric fusion welding machine for PE pipes, and don't use self-made heating tools - the temperature and pressure of simple equipment are unstable, which can easily lead to welding tumors or not soldered through.

- Cooling should be "patient": don't worry about moving the pipeline

After the welding is completed, be sure to wait for the pipeline to be completely cooled (the pressure holding time is calculated according to "pipe diameter 1 second", such as DN110 pipe pressure holding for 110 seconds), and then remove the fixing device. Moving in advance will cause the interface to deform and bury hidden dangers of blockage.

Final summary: Standardized operation is the key

PE pipe drain welding itself will not be blocked, and the problem is often caused by "irregular operation". As long as you do a good job of interface cleaning, precise alignment, parameter control, and regular inspections (such as using pipe cameras to check the internal situation), you can keep the PE pipe drainage system open.

in the end, welding is a "meticulous job" - spend more time on the details, you can avoid the trouble of digging the pipe later.