Testing of welding properties on shop primers according HRN EN ISO 17652-2

Diplomski rad pod nazivom „Ispitivanje zavarivačkih svojstava temeljnih premaza sukladno HRN EN ISO 17652-2“ sastoji se od teorijskog i eksperimentalnog dijela. U teorijskom dijelu su razrađene primarne vrste temeljnih premaza, njihova svojstva i specifičnosti primjene, ali se razradio i razvoj novih temeljnih premaza koji su ekološki prihvatljiviji. Kod primjene u industriji fokus je stavljen na brodogradnju zbog velikog značaja i učestalosti primjene pri proizvodnji. Također su prikazane osnovne značajke rada MAG i FCAW postupka zavarivanja, kod MAG postupka zavarivanja detaljnije su razrađeni načini prijenosa metala zbog svog utjecaja na kvalitetu zavara. Za kraj teoretskog dijela je detaljno opisana norma ISO 17652-2 na kojoj se eksperimentalni dio diplomskog rada temelji. U eksperimentalnom dijelu diplomskog rada provedeno je ispitivanje zavarivačkih svojstava na materijalu S355NL premazanog dvokomponentnim temeljnim premazom na osnovi epoksidnog veziva i poliamidaminskog utvrđivača. Radni komadi su obostrano zavareni kutnim zavarom MAG i FCAW postupcima zavarivanja te je provedena usporedba. Za oba postupka zavarivanja su korišteni isti parametri. Provedeno je ispitivanje savijanjem te analiza makrouzoraka radi usporedbe geometrijskih značajki.Thesis entitled "Testing of welding properties of shopprimers according to the HRN EN ISO 17652-2" consists of a theoretical and experimental part. In the theoretical part, the basic types of primers, their properties and specifics of application are elaborated, but the development of new primers that are environmentally friendly is also elaborated. When it comes to the use in the industry the focus was placed on the shipbuilding due to its great importance and frequency of application in production. The basic characteristics of the MAG and FCAW welding process are also presented, with the MAG welding process the methods of metal transfer are elaborated in more detail due to their influence on the weld quality. For the end of the theoretical part, the standard ISO 17652-2 on which the experimental part of the thesis is based is described in detail. In the experimental part of the thesis, the testing of welding properties of the material S355NL which was coated with two - component shopprimer based on epoxy binder and polyamidamine hardener was conducted. The workpieces were welded on both sides by MAG and FCAW (filler joints) and a comparison was made. The same parameters were used for both welding processes. Bending testing and analysis of macro-samples to compare geometric features have been conducted