Uporaba varjenja TIG z vročo žico za reparaturno varjenje orodij

Kovačič, Tim (author), Klobčar, Damjan (mentor), Tušek, Janez (comentor)

Cilj dela je bil predstaviti nov postopek varjenja TIG z vročo žico za reparaturno varjenje orodij. Popravilo orodij je tehnološko zahtevno opravilo, ki se ga opravi v bistveno krajšem času kot izdela novo orodje. Za zahtevane mehanske lastnosti zvara je ključna izbira pravilnih varilnih parametrov, dodajnega materiala ter naknadne toplotne obdelave. Z ustrezno tehnologijo varjenja lahko orodjem podaljšamo obratovalno dobo. Teoretični del zajema definicijo orodnega jekla, vpliv legirnih elementov in toplotne obdelave. Sledi opis najpogostejših mehanizmov za propad orodij za delo v vročem ter priporočila za varjenje le-teh. V nadaljevanju je podrobno opisano delovanje vira varilnega toka TIP TIG ter njegovih lastnosti. Predstavljena je metodologija izbire dodajnega materiala ter varilnega postopka. S pomočjo rezultatov o preliminarnem preizkusu je bil določen plan toplotne obdelave za vse vzorce. Opravljene so bile meritve trdote po metodi Vickers, izvedene metalografske analize, ter določene natezne trdnosti in udarne žilavosti. Rezultati testov so bili vrednoteni glede na zahtevane mehanske lastnosti orodij. Na podlagi izvedene raziskave so vzorci, ki so bili homogenizacijsko in raztopno žarjeni ter starani, dosegli optimalne mehanske lastnosti.

• Language: Slovenian
• Keywords: varjenje TIG TIG z vročo žico, orodno jeklo H11, maraging jeklo, metalografska analiza, natezna trdnost, trdota, toplotna obdelava, maraging jekel, udarna žilavost
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [T. Kovačič]
• Year: 2019
• Number of pages: XXIV, 75 str.
• PID: 20.500.12556/RUL-107316
• UDC: 621.791.7:669.14(043.2)
• COBISS.SI-ID: 16560923
• Publication date in RUL: 29.03.2019

KOVAČIČ, Tim, 2019, Uporaba varjenja TIG z vročo žico za reparaturno varjenje orodij [online]. Master’s thesis. Ljubljana : T. Kovačič. [Accessed 29 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=107316

Secondary language

• Language: English
• Title: Use of hot wire TIG for repair welding of tool steels

Abstract

Aim of this thesis is to research new hot-wire TIG welding process for repair welding of tool steels. Repair of hot work tools is a complex procedure, which can be done in a significantly shorter time than manufacturing new tools. In order to meet required mechanical properties, it is crucial to select right welding parameters, filler material and post heat treatments. With a correct use of welding technology, it can prolong the life span of tool steels. Theoretical part contains definition of tool steels, influence of alloy elements and heat treatments. Furthermore, there is a description of different factors on why tools fail, and recommendation for their repair welding. After an in-depth description of the principals of the TIP TIG hot-wire system, its cons and pros were listed in respect with other welding processes. Methodological approach is considered when selecting filler material and parameters. With the help of results of preliminary test, post heat treatment was selected. Vickers hardness tests and metallographic analysis were carried out, as well as determined tensile strength and fracture toughness. Results were analyzed based on the requirements of tool steels. Based on the research best results were obtained with solution annealing in three steps and ageing process.

• Keywords: hot-wire TIP TIG, tool steel H11, maraging steel, metallographic analysis, tensile strength, hardness, heat treatment of maraging steels, fracture toughness