Eliminacija tunela pri zavarivanju trenjem alatom legure Al 5052-H32

Abstract

Some experiences in elimination of tunnel type defect Friction Stir Welding of Al alloy 5052-H32 are presented in this paper. In order to evaluate the influence of the processing parameter (ratio between rotation and translation speed during welding) on the occurrence of tunnel type defects and quality of welded joint, different welding parameters were varied. Welded joints were tested by means of both nondestructive (visual inspection, X-ray inspection) and destructive (metallographic, bending, tension and hardness) testing. Best results were obtained for the ratio between 6.45 and 8.22. Results suggest that with this ratio, the material flows around the pin with optimal speed, i.e. sufficient amount of material is available to fulfill the gap and prevent tunnel formation.U radu su predstavljena iskustva na eliminaciji greške tunela u zavarenim spojevima dobijenih zavarivanjem ploča postupkom zavarivanja trenjem alatom na leguri Al 5052-H32. U cilju određivanja uticaja parametara zavarivanja (odnos brzine rotacije alata i brzine zavarivanja-translacije) na pojavu greške tunela i kvalitet zavarenog spoja, parametri su varirani u širokom opsegu. Zavareni spojevi su ispitivani metodama bez razaranja (vizuelno, penetrantima i rentgenski) i sa razaranjem (metalografski, zatezanje, tvrdoća i savijanje). Zavareni spojevi sa najboljim osobinama postignuti su kod spojeva zavarenih korišćenjem odnosa u opsegu od 6.45 do 8.22. Rezultati ukazuju da su to odnosi koji obezbeđuju optimalni način tečenja materijala oko trna alata, tj. da je kontinuirani dotok materijala na povratnu stranu dovoljan da homogeno popunjava prazninu i spreči pojavu kanala