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Wire arc additive manufacturing (WAAM) which is literally based on continuously fed material deposition type of welding processes such as metal inert gas (MIG), tungsten inert gas (TIG) and plasma welding, is a variant of additive manufacturing technologies. WAAM steps forward with its high deposition rate and low equipment cost as compared to the powder feed and laser/electron beam heated processes among various additive manufacturing processes. In this work, sample parts made of low allow high strength steel (ER120S-G) was additively manufactured via WAAM method using robotic cold metal transfer technology (CMT). The process parameters and building strategies were investigated and correlated with the geometrical, metallurgical and mechanical properties on the produced wall geometries. The results obtained from the thin wall sample parts have showed that with increasing heat input, mechanical properties decreases, since higher heat accumulation and lower cooling rate increases the grain size. The tensile tests results have showed that casting steel (G24Mn6+QT2) mechanical properties which requires 500 MPa yield strength can be compared to with as build WAAM process having 640 MPa yield strength. Tensile strength were fulfilled for S690Q and yield strength is very close to the reference value. Rezime Aditivna proizvodnja žicom i električnim lukom (Wire arc additive manufacturing WAAM), koje je bukvalno zasnovano na neprekidnom polaganju materijala pri postupcima zavarivanja poput metal inertnog gasa (MIG), tungsten inertnog gasa (TIG) i plazma zavarivanja, predstavlja varijantu tehnologuje za aditivnu proizvodnju. WAAM se ističe svojom velikom brzinom deponovanja dodatog materijala i jeftinom cenom opreme, u poređenju sa mnogim drugim procesima aditivne proizvodnje, koji se oslanjaju na prahove i laserske/elektronske zrake. U ovom radu je prikazana proizvodnja uzoraka od niskolegiranog čelika povišene čvrstoće (ER120S-G) primenom WAAM metode, uz pomoć robotizovane tehnologije hladnog transfera metala (Cold metal transfer – CTM). Parametri procesa i strategije izrade su analizirane i povezane sa geometrijskim, metalurškim i mehaničkim osobinama proizvedenih geometrija spojeva. Rezultati dobijeni iz uzoraka tankozidnih delova su pokazali da povećan unos toplote dovodi do opadanja mehaničkih osobina, s obzirom da veća količina toplote snižava vreme hlađenja, što dovodi do porasta zrna. Rezultati ispiutivanja na zatezanje su pokazali da liveni čelik G24Mn6+QT2, čija zahtevana granica tečenja iznosi 500 MPa može da se uporedi sa rezultatima WAAM procesa, sa granicom tečenja od 640 MPa. Zatezna čvrstoća je zadovoljena za čelik S690Q, dok je i granica tečenja veoma bliska referentnoj vrednosti.

Building strategy effect on mechanical properties of high strength low alloy steel in wire + arc additive manufacturing