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Nowadays, one of the basic trends in the industry is the environmental impact reduction, in other words the weight decreasing of structural elements and structures, which can be approached by applying different high strength steels. In case of different steel structures, the main manufacturing and joining technology is the welding, the conventional and advanced methods of fusion and pressure welding processes. Beside the weight decreasing, the reliability and safety requirements according to steel structures have significant grown. During the welding process, the welded parts are affected with heat-effect and mechanical loads, which result in inhomogeneous welded joint. The inhomogeneity of the welded joints appears both in microstructural (local) and in geometrical (both local and global) aspects. The changes in microstructure and geometry appear in deflections (basically acceptable), or rather in failures (basically unacceptable); and these influence both the behaviour and the loadability of welded joints. Discontinuities in base materials and their welded joints have especially high danger in case of cyclic loading conditions, which are typical for different structures and structural elements (e.g. bridges, vehicles). There are different standards and prescriptions containing fatigue crack propagation limit curves and rules for the prediction of the crack growth; simple and two-stage crack growth relationships can be found in the literature, most frequently based on the Paris-Erdogan law. The paper summarizes and presents the results according to our fatigue crack growth investigations on Weldox 700E and Weldox 960E quenched and tempered Rezime Danas je jedan od osnovnih trendova u industriji, smanjenje uticaja na životnu sredinu, drugim rečima smanjenje težine konstrukcijskih elemenata i konstrukcija kojima se može pristupiti primenom različitih čelika velike čvrstoće. U slučaju različitih čeličnih konstrukcija, glavna tehnologija proizvodnje i spajanja je zavarivanje, konvencionalnim i naprednim postupcima zavarivanja topljenjem i pritiskom. Pored smanjenja težine, zahtevi za pouzdanost i sigurnost čeličnih konstrukcija su značajno porasli. Tokom procesa zavarivanja, na zavarene delove utiču toplotna i mehanička opterećenja, što rezultira nehomogenim zavarenim spojem. Nehomogenost zavarenih spojeva pojavljuje se i u mikr strukturi (lokalni) i u geometrijskim (i lokalnim i globalnim) aspektima. Promene mikrostrukture i geometrije pojavljuju se u odstupanjima (u osnovi prihvatljivo), ili bolje rečeno u lomovima (u osnovi neprihvatljivo); a oni utiču i na ponašanje i na nosivost zavarenih spojeva. Prekidi u osnovnim materijalima i njihovim zavarenim spojevima imaju posebno veliku opasnost u slučaju cikličnih opterećenja, koji su tipični za različite konstrukcije i konstrukcijske elemente (npr. mostovi, vozila). Postoje različiti standardi i preporuke koji sadrže granične krive širenja zamorne prsline i pravila za predviđanje rasta prslina; u literaturi se mogu naći jednostavni i dvostepeni odnosi rasta prslina, koji se najčešće zasnivaju na Paris-Erdogan-ovom zakonu. Rad rezimira i prikazuje rezultate prema našim istraživanjima rasta prslina na Weldox 700E i Weldox 960E kaljeni i otpušteni (Q + T) i na Alform 960M termomehanički obrađenom (TM) čeliku NAUKA∗ISTRAŽIVANJE∗RAZVOJ SCIENCE∗RESEARCH∗DEVELOPMENT 76 ZAVARIVANJE I ZAVARENE KONSTRUKCIJE, 2/2020, str. 75-86 (Q+T) and on Alform 960M thermomechanically treated (TM) high strength steel base materials and their gas metal arc welded joints. The mismatch effect has also been studied; matched, overmatched, undermatched and matched/overmatched (mixed-matched) welded joints were investigated. 15 mm thick plates were used for the investigations, statistical aspects were applied both for presenting the possible crack locations in the real plates, as well as for processing the measured data. Furthermore, the results will be compared with each other, and fatigue crack propagation limit curves will be derived using simple crack growth relationship. visoke čvrstoće osnovni materijali i njihovi spojevi zavareni elektrolučno u zaštiti gasa. Efekat neusklađenosti je takođe proučen; ispitivani su podudarni, jači (overmatched ), slabiji (undermatched), podudarni i podudarni / jači (mešani) zavareni spojevi. Korišćene su ploče debljine 15 mm za istraživanja, primenjeni su statistički aspekti i za predstavljanje mogućih lokacija prslina u stvarnim pločama, kao i za obradu izmerenih podataka. Pored toga, rezultati će se upoređivati jedan sa drugim i sa graničnom krivom širenja zamorne prsline će se izvesti pomoću jednostavnog odnosa rasta prslina.

Mismatch effect on fatigue crack propagation limit curves of S690QL, S960QL and S960TM type base materials and their gas metal arc welded joints