HEAT TREATMENT OF WELDING JOINTS

U ovom diplomskom radu analizirana je tema toplinska obrada zavarenih spojeva za čelike koje se koriste u kotlogradnji. Radom je obuhvaćen opis postupaka toplinskih obrada kao što su: žarenje za redukciju zaostalih naprezanja, normalizacijsko žarenje, poboljšavanje, rastvorno žarenje (gašenje), i predgrijavnje. Uz navedene postupke toplinske obrade obuhvaćen je opis: ugljičnih nelegiranih čelika, mikrolegirani i niskolegirani finozrnati visokočvrsti čelici, legirani Mo, CrMo i CrMoV čelici, CrNi austenitni nehrđajući čelici i visoko legirani Cr čelici martenzitnog i feritnog tipa, i još dodatno su opisani martenzitni čelici otporni na puzanje P91 i P92. Toplinska obrada zavarenih spojeva provodi se s ciljem vraćanja osnovnih (ili postizanja boljih) svojstava metala koja su promijenjena zavarivanjem.In this master thesis the topic of heat treatment of welded joints for steel used in boating is analyzed. The paper describes a description of heat treatment processes such as: reduction of residual stress reduction, normalization, improvement, solenoid, and preheating. In addition to the above mentioned heat treatment processes, description is made of: carbon non-alloyed steels, micro-alloyed and low-alloy finishing high strength steels, bonded Mo, CrMo and CrMoV steels, CrNi austenitic stainless steels and high alloyed Cr steels of martensitic and ferrite type, and further described martensitic resisting steels on the crawl of P91 and P92. Thermal welding of welded joints is carried out with the aim of restoring the basic (or achieving better) metal properties that has been changed by welding