Utjecaj parametara zavarivanja na propusnost spoja polipropilenske cijevi

U ovom radu prikazano je elektrofuzijsko zavarivanje polietilenske elektrospojnice na pet pripremljenih uzoraka. Polietilenska elektrospojnica koja se nalazi na sredini svakog pripremljenog uzorka je elektrofuzijski zavarena, ali svaka pod različitim uvjetima zavarivanja. Tako je prvi uzorak zavaren prema pravilu struke tj. prema uputama proizvoĎača opreme za elektrofuzijsko zavarivanje te prema uputama proizvoĎača cijevi i elektrofitinga. Kod drugog i trećeg uzorak simulirani je prekid struje kod različitog vremena trajanja zavarivanja. Četvrti uzorak je pothlaĎen na -12°C, a peti uzorak zagrijan na 100°C te se na taj način simuliralo pogrešno unošenje vanjske temperature u ureĎaj za zavarivanje. Nakon elektrofuzijskog zavarivanja svakog uzoraka pod različitim uvjetima napravljeno je tlačno ispitivanje svakog pojedinog uzorka, vodom kao medijem kako bi se ispitala nepropusnost zavarenog spoja. S obzirom da je tlačno ispitivanje pokazalo da kod nekih uzoraka dolazi do propuštanja na zavarenom spoju napravljena je analiza svakog zavarenog spoja kako bi se vidjelo i utvrdilo što se dogodilo sa svakim od njih.This research paper presents the electrofusion welding of the polyethylene electric-welding pipe fitting on the five prepared samples. The polyethylene electric-welding pipe fitting which is placed in the middle of each prepared sample has been welded using electrofusion, but all of them are welded under different welding conditions. Therefore, the first sample is welded in a way that it is consistent with common practice, i.e. according to the instructions of the manufacturer's equipment for electrofusion welding, and according to the instructions of the manufacturer of pipes and electrical fittings. The second and the third sample show a simulated power outage with different durations of welding. The fourth sample is cooled down to -12°C, and the fifth one is heated to 100°C, and in this way the incorrect intake of the outdoor air temperature into the welding device is simulated. After the electrofusion welding of each sample under different conditions, the pressure test of each sample was performed using water as a medium with the purpose of testing the tightness of the welding joint. Since the pressure testing has proven that some samples show leakage of the welding joint, the analysis of each welding joint was performed in order to see and determine what happened to each of them