About the hot-melt pipe fittings, many people will ask, how to adjust the length of the observation hole of PE hot-melt pipe fittings after welding, how long is better? In fact, when the wall thickness of PE pipe is certain, it can be adjusted by the layout depth of resistance wire, and the length of observation hole can also reflect the quality of wiring. If it is too long, the wiring is too deep; if it is too short, the wiring is too shallow. Generally, the appearance of the observation hole is only used as the sign of the completion of welding, and there is no specific requirement, but the normal appearance of 5 mm ~ 6 mm is appropriate.

How to prevent short circuit and boiling of PE hot melt pipe during welding? The most common reason is that the positioning of PE pipe in the pipe is incorrect: the insertion depth is not in place, and the axial direction is not aligned; Or PE pipe and pipe fitting size with a large deviation, such as pipe roundness seriously exceed the standard. In addition, there may be water at the joint between the electric melting pipe fitting and the pipe, or the heating time is too long, which makes the resistance wire contact when it swims inside the pipe, or the resistance wire is oxidized when the bare wiring pipe fitting is used, or the resistance wire is taken out when it is inserted, which leads to improper selection of resistance wire, local carbonization caused by instantaneous heating and short circuit. Before welding, the sundries on the surface of pipe fittings and pipes shall be cleaned, the oxide layer on the surface of pipes shall be scraped off, and the pipe fittings with embedded wiring shall be welded in strict accordance with the process.