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Title: Popravila ulitkov z varjenjem Authors: ID Slovaček, Marek (Author) ID Kubíček, J. (Author) ID Kaňa, V. (Author) Files: PDF - Presentation file, download (1,95 MB) MD5: 5E2B45C8C725DCFBB346A54F7727A2F1   Language: English Organization: DLS - Slovenian Foundrymen Society Abstract: V večini primerov je treba sestavne dele, izdelane z litjem, po proizvodnji popraviti z varjenjem. To velja predvsem za velike ulitke iz jekla. Sicer se z varjenjem popravljajo tudi litoželezni ulitki, vendar po naših izkušnjah napake nastajajo predvsem med delom omenjenih sestavnih delov. So pa popravila ulitkov iz litega železa zaradi njihove krhkosti zelo zapletena. V članku so predstavljeni možni načini popravil z varjenjem in njihova priprava. Na primer, za ulitke iz litega železa obstajajo tri vrste tehnologij za popravila z varjenjem, in sicer s predgrevanjem do vroče, srednje in nizke temperature, kar pomeni, da se razlikujejo temperatura predgretja, način varjenja in material polnila. Tehnologijo varjenja za popravilo je treba izbrati ne le glede na zahteve za popravilo razpok, temveč tudi glede na zahtevano kakovost materiala na območju popravila, ki bo ustrezal delovnim razmeram, kot so dinamični učinek, utrujenost zaradi obremenitev, obraba ali korozija. V večini primerov so pri ulitkih iz jekla po popravilu z varjenjem sestavni deli tudi toplotno obdelani. Trenutna priprava popravil ulitkov s tehnologijo varjenja lahko vključuje sodobne metode, kot so numerična simulacija varjenja, preskusi prototipov in posebno termo-mehansko preverjanje na napravi GLEEBLE. Vsi navedeni sodobni postopki bodo predstavljeni na konkretnih praktičnih primerih tako ulitkov iz jekla kot litega železa. Prikazano bo popravilo ulitka iz jekla kot pokrova turbine iz materiala P91 in optimizacija na podlagi numerične simulacije, kar pomeni, da bo prikazana lokalna struktura materiala, trdota in preostale obremenitve po popravilu. V tem primeru je bila z uporabo stroja GLEEBLE pripravljena lokalna struktura materiala iz toplotno vplivane cone in opravljeni so bili natezni preizkusi, kar pomeni, da so bile ugotovljene lokalne lastnosti materiala. Nazadnje bo prikazano popravilo razpoke v ulitku iz litega železa, ki je del stiskalnega stroja, s polnilom na osnovi niklja, kar pomeni, da je bil opravljen celoten preskus varjenja prototipa ter destruktivno in mehansko preizkušanje, ki je potrdilo zahtevane mehanske parametre. Ključne besede: jekleni ulitek, litoželezni ulitek, popravilo z varjenjem, numerična simulacija varjenja SYSWELD, preizkusi prototipov, termo-mehansko-fizikalno preizkušanje, GLEEBLE, GX23CrMoV12-1, GJS 700-2 Publication date: 01.01.2026 Year of publishing: 2026 Number of pages: str. 10-24 Numbering: Letn. 73, št. 1 PID: 20.500.12556/DiRROS-30153  UDC: 621.791:621.74 ISSN on article: 0024-5135 COBISS.SI-ID: 281717251  Note: Besedilo v slov in angl.; Publication date in DiRROS: 16.06.2026 Views: 178 Downloads: 73 Metadata:    Cite this work Plain text BibTeX EndNote XML EndNote/Refer RIS ABNT ACM Ref AMA APA Chicago 17th Author-Date Harvard IEEE ISO 690 MLA Vancouver : Copy citation

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Record is a part of a journal

Title:	Livarski vestnik : glasilo Društva livarjev Slovenije
Shortened title:	Livar. vestn.
Publisher:	Društvo livarjev Slovenije
ISSN:	0024-5135
COBISS.SI-ID:	2616322

Secondary language

Language:	Slovenian
Title:	Casting repairs by welding
Abstract:	In most cases, the components produced by casting have to be repaired using welding technology after production. This mainly concerns large steel castings. However, even cast-iron castings are repaired by welding, but from our experience, defects mainly arise during the operation of the mentioned components. However, repairs of cast iron castings are very complicated due to their brittle behaviour. The article will present possible methods of welding repairs and their preparation. For example, for cast iron castings, there are three types of welding repair technologies as by using hot temperature, middle temperature, and cold. This means the differences are preheating temperature, welding method, and different filler material. The repair welding technology has to be chosen not only accordingarea, which will fit to working conditions as dynamic effects, fatigue loading, abrasion, or corrosion. In most cases for steel casting after welding repair, the steel casting components will also be heat treated. The current preparation of casting repairs by welding technology can include modern methods such as welding numerical simulation, prototype tests, and special thermo-mechanical verification on the GLEEBLE device. All of the above modern procedures will be presented in specific practical cases, for both steel and cast-iron castings. It will be shown one repair of steel casting as turbine cover made from material P91 and optimisation based on numerical simulation, that means it will be shown local material structure, hardness, and residual stresses after repair. Also, in this case, by using the GLEEBLE machine, the local material structure from heat-affected zone has been prepared, and the tensile tests have been done, which means there has been identified local material properties. The last repair of the crack in the cast iron casting, it is part of a press machine by nickel-based filler material will be demonstrated which means the complete prototype welding test and destructive and mechanical testing have been done and have confirmed receiving the required mechanical parameters. Keywords: steel casting, cast iron casting, welding repair, SYSWELD welding numerical simulation, prototype tests, thermo-mechanical-physical testing, GLEEBLE, GX23CrMoV12-1, GJS 700-2
Keywords:	ulitki, varjenje, popravilo, mehanske lastnosti, litine, jeklo

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