technologia naprawy uchwytów klapy dużej biernej silnika odrzutowego Rd-33 rd-33 jet engine large passive flap handles repair technology Prof. dr hab. inż. Andrzej Klimpel, dr inż. Agnieszka Rzeźnikiewicz-Politechnika Śląska, Gliwice. Streszczenie Badania uszkodzeń uchwytów klapy dużej biernej silnika wykazały, że naprawa tych elementów wymaga opracowania warunków technologicznych napawania automatycznego plazmowego PTA oraz napawania laserowego HPDL materiałami dodatkowymi zapewniającymi zwiększoną odporność na zużycie ścierne metal-metal, w stosunku do materiału podłoża. Wstępne próby napawania plazmowego PTA oraz napawania laserowego HPDL wykazały, że można uzyskać napoiny wysokiej jakości. Przez odpowiedni dobór parametrów napawania możliwe jest sterowanie wymiarami napoin oraz udziałem materiału podłoża w napoinie. Wykonano również badania odporności na zużycie ścierne połączenia metal-metal zgodnie z normą ASTM G99. Wyniki badań tribologicznych wykazały, że warstwa napawana laserowo z dodatkiem proszku 50%Ti-50%WC spełnia wszystkie warunki i jest prawie 124 razy bardziej odporna na zużycie ścierne typu metal-metal niż powierzchnia nieutwardzona.
The article presents results of tests concerning the effect of heat treatment on the structure and hardness of submerged arc welded joints made in steel 7CrMoVTiB10-10 (T24). The tests revealed that the welds made of steel 7CrMoVTiB10-10 required post-weld heat treatment at a temperature 750°C. The heat treatment was performed in order to protect welded structures from cracking during transport and operation as well as to prevent the development of secondary hardness.
The aim of the research was to assess the adhesion of the powder flame sprayed coatings to the previously prepared substrate. The spraying tests were carried out using Rototec 51000 base powders which was Ni-Al-Mo alloys, then coated with an outer coating made of Rototec 19404, which is an alloy Fe-Cr-Co-Mo. The coatings were tested for adhesion in accordance with the PN-EN ISO 14916: 2017 standard and also topography tests of sprayed coatings using scanning electron microscopy.
The aim of the research was to investigated the influence of cooling rate during welding on joint properties made of austenitic steel 1.4301. Three test panels were made: cooled in air, cooled by dipping the plate in water and cooled by spraying water from the side of the weld ridge. Non-destructive examinations (visual, penetrative and radiographic) and destructive tests (stretching, bending and impact tests) were made on the test panels. In addition, the ferrite content measurement was carried out. It has been shown that the cooling affects the ferrite content and the impact strength of the joint.
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