Spajanje poliuretanskih pen - PUF različnih gostot z vročim zrakom

Perko, Kristjan (author), Klobčar, Damjan (mentor)

Za kakovostno spajanje poliuretanskih pen z vročim zrakom, je potrebno določiti optimalne parametre varjenja. V nalogi smo varili pene različnih gostot z različnimi temperaturami zraka in dimenzijami šob. Med spajanjem je bila hitrost varjenja in oddaljenost šobe od pene konstantna. Prenizek vnos energije rezultira v premajhno količino raztaljenega materiala in nižjo trdnost spoja. Pri prevelikem vnosu energije pa lahko pride do prekomernega pretaljevanja materiala, nižjo trdnost spoja zaradi manjšega prečnega preseka in na otip tršega zvara. Izvedli smo preizkusno varjenje z vročim zrakom v okviru vnaprej določenih procesnih parametrih. Zvare smo vrednotili po treh kriterijih: izvedli vizualno oceno zvarnega spoja, mesto pretrga pri natezno-strižnem preizkusu (na spoju ali v osnovnem materialu) in trdoto zvara na otip. Ugotovili smo, da gostota pene močno vpliva na izbor procesnih parametrov. Za naše primere varjenje smo na podlagi eksperimentov določili za najbolj primerne parametre šobo dimenzij 20 mm x 2,5 mm in spajanje s stopnjo gorilnika 3,5.

• Language: Slovenian
• Keywords: poliuretanska pena, varjenje, spajanje z vročim zrakom, gorilnik na vroči zrak
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [K. Perko]
• Year: 2021
• Number of pages: XIV, 28 str.
• PID: 20.500.12556/RUL-130017
• UDC: 678.664:621.791(043.2)
• COBISS.SI-ID: 82359043
• Publication date in RUL: 10.09.2021

PERKO, Kristjan, 2021, Spajanje poliuretanskih pen - PUF različnih gostot z vročim zrakom [online]. Bachelor’s thesis. Ljubljana : K. Perko. [Accessed 25 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=130017

Secondary language

• Language: English
• Title: Joining polyurethan foams - PUF of different densities with hot air

Abstract

To ensure high-quality joints of polyurethane foam with hot air, it is necessary to determine the optimal welding parameters. We welded foams of different densities with different temperatures and nozzle dimensions. The welding speed and the distance between the nozzle and the foam were constant throughout the process. An insufficient amount of energy input results in not enough welded material and lower joint strength. Excessive energy input can lead to excessive remelting of the material, lower joint strength, because of a smaller cross-section, and a harder weld to the touch. We performed a test hot air welding within predefined process parameters. We evaluated the welds according to three criteria: visual evaluation of the welded joint, a break point in the tensile-shear test (at the joint or in the base material), and the hardness of the weld to the touch. We found that the density of the foam strongly influences the selection of process parameters. In our case, we determined that the most suitable nozzle was the 20 mm x 2,5 mm dimension nozzle, and optimal welding power of hot air gun at level 3,5.

• Keywords: polyurethane foam, welding, hot air welding, heat gun