Analysis of welding technology on Thor electric bicycle frame

U ovom radu provedena je analiza tehnologije zavarivanja spoja na okviru električnog bicikla Thor, tvrtke DC Bikes. U teorijskom dijelu rada opisan je izbor materijala pri izradi okvira bicikla, karakteristike MIG/MAG postupka zavarivanja koji se koristio za izvedbu ovoga spoja, te su dane osnovne informacije o pravilnom konstruktivnom oblikovanju s obzirom na zavarivanje. Uzorci su zavareni, jedan u Laboratoriju za zavarivanje na Fakultetu strojarstva i brodogradnje, drugi u TEP-u. Pritom su korišteni različiti procesni parametri i oprema, navedeni u eksperimentalnom dijelu rada. Nakon zavarivanja oba spoja ispitana su penetrantskom tehnikom s ciljem otkrivanja eventualnih nepravilnosti otvorenih prema površini. Iz oba uzorka izrezani su makroizbrusci, te je provedena geometrijska analiza poprečnih presjeka zavara i ispitivanje tvrdoće.In this thesis, the welding technology of a joint on the frame of the electric bicycle Thor, of the company DC Bikes, was analyzed. In the theoretical part of the thesis, choosing the material for the construction of bike frames is described, as well as the characteristics of the MIG/MAG welding process which was used to perform the joint. Basic information about proper constructive design with respect to welding, was given. The samples were welded, one in the Laboratory at the Faculty of Mechanical Engineering and Naval Architecture, the other one in TEP. Different equipment and process parameters were used in doing so, which is shown in the experimental part of the thesis. After welding, both joints were tested using penetrant inspection in order to detect possible irregularities open to the surface. Macrographs were cut out of both samples, geometric analysis of weld cross-sections and hardness testing were performed