INFLUENCE OF IMPACT TOUGHNESS ON WELD METAL FRACTURE TOUGHNESS OF ENERGY COMPONENT

Magistrska delo zajema kratek teoretični opis osnovnih značilnosti zvarnih spojev. Pri tem je opisana problematika pojava razpok v varjenih konstrukcijah, ki so hkrati najbolj nezaželene napake, ki se pogosto pojavljajo pri zvarnih spojih. Opisana je tudi določitev Charpyjeve udarne žilavosti in določitev, ter pomen lomne žilavosti zvara. Praktičen del zajema določitev eksperimentalne udarne žilavosti zvara v korenu in temenu. Osnovne mehanske lastnosti temena in korena zvara so predstavljene s pomočjo korelacijskih enačb na podlagi mikrotrdote v korenu in temenu zvara. Med osnovne mehanske lastnosti zvara sodijo meja tečenja in natezna trdnost. Cilj naloge predstavlja izračun lomne žilavosti zavra na podlagi eksperimentalnih rezultatov udarne žilavosti. Izračun je izveden po dveh različnih metodah. Namen magistrske naloge je prikazati, kako lahko tehnično korektno in ekonomično upravičeno pridemo do odličnih rezultatov določitve lomne žilavosti. Rezultati izhajajo na podlagi izvedbe Charpyjevega preizkusa udarne žilavosti.Master\u27s work covers a brief theoretical description of the basic characteristics of welded joints. It is described the problem of occurrence of cracks in welded structures, which are at the same time the most undesirable errors that often occur in welded joints. Determination of Charpy\u27s is also described the impact toughness and determination, and the importance of the toughness of the weld. Practical part of the experimental determination of weld toughness covers in the root and crown. The basic mechanical properties of crown and root of the weld are presented through correlation equations on the basis of microhardness in the root and crown of the weld. The basic mechanical properties of the weld yield strength and tensile strength limit of the fall. The objective of the tasks is the calculation of toughness on the basis of the results of the experimental impact reject toughness. The calculation is carried out by two different methods. The purpose of the thesis is to show how you can technically and economically justified, we get to the excellent results of the determination of the toughness. Results are derived on the basis of performance Charpy\u27s impact toughness test