Analisys of weldability test methods according standard HRN EN ISO 17642

U teorijskom dijelu rada dan je pregled ispitnih metoda za procjenu zavarljivosti s aspekta pojave hladnih pukotina, definiran nizom normi HRN EN ISO 17642. Opisani su glavni uzroci koji utječu na pojavu hladnih pukotina s posebnim naglaskom na zavarljivost čelika ultra visoke čvrstoće. U eksperimentalnom dijelu rada odabrana je ispitna metoda za procjenu zavarljivosti u skladu s normom HRN EN ISO 17642. Za odabrani osnovni i dodatni materijal definirana je priprema ispitnih komada, parametri zavarivanja i priprema ispitnih uzoraka. Provedeno je metalografsko ispitivanje i mjerenje tvrdoće ispitnog uzorka i analizirani su dobiveni podaci temeljem ispitivanja.In the theoretical part of the paper, an overview of test methods for the evaluation of weldability from the aspect of the occurance of cold cracks is given, according to series of standards HRN EN ISO 17642. The main causes influencing the appearance of cold cracks are described with special emphasis on the weldability of ultra high – strength steel. In the experimental part of the paper, a test method was selected for the evaluation of weldability in accordance with the standard HRN EN ISO 17642. For the selected parent material and consumable material, the preparation of test plates, welding parameters and preparation of test specimens are defined. Metallographic examination and hardness testing of the test specimen was performed and the obtained data, based on the test, were analysed