Wire and arc additve manufacturing of structural steel

Konstrukcijsko jeklo predstavlja enega izmed najpogosteje uporabljenih materialov na področju strojništva. Zaradi vse večje geometrijske zapletenosti izdelkov, ki jih ne moremo izdelati z konvecionalnimi tehnologijami so se v zadnjih letih razvile aditivne tehnologije. Uporaba aditivnih tehnologij omogoča izdelavo takšnih izdelkov. Naloga je osredotočena na raziskavo oblikovnega obločnega navarjanja konstrukcijskega jekla. Preizkusi so izvedeni z uporabo CNC stroja in sinergijskega vira toka. Vzorci so izdelani s postopkom varjenja MIG/MAG (angl. Metal active gas / Metal inert gas) in s programom varjenja za manjše brizganje (angl. low spatter) ob uporabi varilne žice G3Si1 premera 1,2 mm. V okviru diplomske naloge smo preučili vpliv procesnih parametrov, ki omogočajo izdelavo kakovostnih sten. Rezultati naloge kažejo, da je ob uporabi ustreznih varilnih parametrov in medvarkovne temperature mogoče izdelati stene s širino do 9,11 mm ob izkoristku materiala nad 90 %. Ob izdelavi tako širokih sten lahko te naknadno obdelamo in izdelamo tankostenske izdelke visoke natančnosti.Structural steel is among the most widely used material in mechanical engineering. Due to the increasing geometric complexity of products, which precludes the use of conventional technologies, recent years have seen the development of additive manufacturing technologies that make the manufacture of such products practical. This thesis focuses on the research of shape-deposition wire-arc additive manufacturing using structural steel. The experiments were carried out using a CNC machine and a synergic power source. The samples were manufactured by a MIG/MAG welding process using a low spatter welding programme and G3Si1 welding wire of 1.2 mm diameter. Within the scope of this diploma thesis, we researched the effects of process parameters that facilitate the manufacture of quality walls. The results show that choosing appropriate welding parameters and interpass temperatures allows fabrication of walls of up to 9.11 mm thickness with a material utilisation rate of over 90 %. Walls manufactured in this thickness can be subsequently processed to yield thin-walled products of highly accurate shape