Uporaba varjenja TIG z vročo žico za reparaturno varjenje orodij

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Tim Kovačič (Author), Damjan Klobčar (Mentor), Janez Tušek (Co-mentor)

Abstract

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.

Keywords

magistrske naloge;varjenje TIG TIG z vročo žico;orodno jeklo H11;maraging jekla;metalografska analiza;natezna trdnost;trdota;toplotna obdelava;udarna žilavost;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[T. Kovačič]
UDC:	621.791.7:669.14(043.2)
COBISS:	16560923
Views:	1236
Downloads:	437
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Use of hot wire TIG for repair welding of tool steels
Secondary 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.
Secondary keywords:	hot-wire TIP TIG;tool steel H11;maraging steels;metallographic analysis;tensile strength;hardness;heat treatment;fracture toughness;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XXIV, 75 str.
ID:	11087283