Grinding is not a necessary step. The connection principle of electrofusion sleeves is to achieve a seal by melting the inner wall's heat-fusion layer with electric current; their design already considers surface adaptability. In most cases, the inner wall of the sleeve is pre-treated at the factory, and reliable welding can be achieved directly by heating. However, if improper storage results in an excessively thick oxide layer, or if burrs are present at the pipe cut, moderate grinding can improve the weld quality.
Three Typical Scenarios Requiring Grinding:
Pipe End Treatment: When polyethylene pipes have obvious flaking or unevenness after cutting, a special scraper is needed to smooth them.
Oxidation Layer Removal: An oxide layer may form on the inner wall of a sleeve after long-term exposure. This can be easily removed by lightly wiping with fine sandpaper (120 grit or higher).
Special Materials: Some modified PE materials have higher surface tension due to differences in additive composition. Slight grinding helps with melt flow.
Golden Rules of Operation:
Grinding depth should not exceed 0.2mm. Excessive processing will damage the pressure-bearing structure.
Avoid using power tools such as angle grinders. Manual operation makes it easier to control uniformity.
After grinding, debris must be cleaned with alcohol. Any residue will cause welding defects.
Sleeves with protective coatings must not be ground. Damaging the conductive layer on the surface will lead to uneven heating.
