Double pulse MIG welding of aluminium alloys

Tema ovog rada je „MIG zavarivanje aluminijskih legura primjenom dvostrukom pulsa“. Rad je podijeljen u dva dijela, prvi dio je teorijski te drugi eksperimentalni. U teorijskom dijelu su opisana svojstva i značaj aluminija i aluminijskih legura s posebnim naglaskom na impulsni način prijenosa metala kod MIG postupka. Objašnjena je ukratko zavarljivost te primjena aluminija i njegovih legura te su navedeni i objašnjeni postupci zavarivanja koji se koriste za zavarivanje aluminijskih legura. To su MIG, TIG, lasersko zavarivanje, plazma zavarivanje i elektrootporno zavarivanje. Od nabrojanih postupaka detaljnije je opisan MIG postupak zavarivanja s fokusom na impulsni način prijenosa metala. U eksperimentalnom dijelu rada izveden je kutni zavar aluminijskih ploča legure 5086 u vertikalnom položaju sa smjerom zavarivanja prema gore prema normi EN ISO 6947. Zavar je izveden inačicom MIG zavarivanja duplim pulsom. Nakon toga su na zavaru provedena razorna i nerazorna ispitivanja prema normi HRN EN ISO 15614-2. Na temelju dobivenih rezultata zaključena je adekvatnost odabrane tehnologije za odabrane parametre zavarivanja.The topic of this paper is „MIG welding of aluminium alloys using a double pulse“. The paper is divided into two parts, the first part is theoretical and the second is experimental. The theoretical part describes the properties and significance of aluminium and aluminium alloys with special emphasis on the pulse mode of metal transfer in the MIG process. The weldability and application of aluminium and its alloys are briefly explained, and the welding procedures used for welding aluminium alloys are listed and explained. These are MIG, TIG, laser welding, plasma welding and resistance welding. Of the listed processes, the MIG welding process with a focus on the pulse mode of metal transfer is described in more detail. In the experimental part of the paper, fillet weld of aluminum plates of alloy 5086 was performed in a vertical position with the welding direction upwards. The weld is performed by the double pulse welding version of MIG. After that, destructive and non-destructive tests were performed on the weld according to the standard HRN EN ISO 15614-2. Based on the obtained results, the adequacy of the selected technology for the selected welding parameters was concluded