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I. SAMARD@I] et al.: INFLUENCE OF THE ACTIVATING FLUX ON WELD JOINT PROPERTIES AT ARC STUD WELDING... a) Trial No. 21 Clean surface of the base metal c) Trial No. 23 Clean surface of the base metal e) Trial No. 25 Clean surface of the base metal g) Trial No. 27 Clean surface of the base metal on the weld joint properties for welding with the arc stud welding process. For lower welding parameters, the stability changes and resulted porosity during welding with the activating flux have also manifested through the variations of the monitored main welding parameters (welding current and voltage). For welding with higher values of welding current and time, the result was a better quality of the weld joint, which is confirmed with the macrosection appearance and also with considerably less oscillation of the monitored welding parameters. So, the important precondition for achieving the quality weld joint with application of the activating flux is the adequate value of welding current that ensures melting of the activating b) Trial No. 22 Activating flux (VS-2E) on the surface of the base metal d) Trial No. 24 Activating flux (VS-2E) on the surface of the base metal f) Trial No. 26 Activating flux (VS-2E) on the surface of the base metal h) Trial No. 28 Activating flux (VS-2E) on the surface of the base metal Figure 3 Weld joint macrosections for weldments with and without the activating flux VS-2E (setup of experiment in Table 2) flux. If the activating flux is not melted, it is imported in the melted weld pool and it induces porosity in the weld joint. It is evident that the welding time of 0,35 s is too short, and the higher value of the welding current is necessary at welding times of 0,45 s and 0,55 s. Also, a further analysis of the macrosections has shown that during welding with the activating flux at higher welding parameters, the weld joints with larger amount of melted metal, compared to welding without the layer of the activating flux on the surface of the base metal, are created. Since the influence of the mentioned activating flux on the appearance of the weld joint is presented in this paper, the influence of the activating flux on the me- 328 METALURGIJA 49 (2010) 4, 325-329
I. SAMARD@I] et al.: INFLUENCE OF THE ACTIVATING FLUX ON WELD JOINT PROPERTIES AT ARC STUD WELDING... chanical properties (possible hardness and strength changes) will be investigated in the following research. Taking into consideration that the applied activating flux is developed for ATIG process, where electric arc is shielded by inert gas, the following experimental welding will be directed to determine the influence of the activating flux on the geometrical and mechanical properties of the weld joint at the drawn arc stud welding process with shielding gas. This experimental research welding was performed with two different types of steel. Therefore, the influence of the activating flux on the weld joint properties is planned to be investigated during the arc stud welding process with the stud and the base metal belonging to the same steel group. REFERENCES 1 N. Nigaj, Welding International, 17 (2003) 4, 257-261. 2 A. Köve{ in Zbornik, 4. Me|unarodno znanstveno-stru~no savjetovanje “Tehnologi~na primjena postupaka zavarivanja i zavarivanju srodnih tehnika u izradi zavarenih konstrukcija i proizvoda“, I. Samardì} (ed.), Strojarski fakultet u Slavonskom Brodu, Slavonski Brod, 2007, 45-51. 3 D. Baji}, Istraìvanje mogu}nosti zavarivanja sklopova energetske opreme primjenom aktiviraju}eg topitelja, Doktorska disertacija, Ma{inski fakultet u Podgorici, Podgorica 2003, 30-61. 4 B. Baji}, D. Baji} in Zbornik, Me|unarodni nau~ni skup „Zavarivanje spaja“, Dru{tvo za zavarivanje Bosne i Hercegovine, Sarajevo, 2005, 105-116. 5 O.E. Ostrovsky, V.N. Krjukovski, B.B. Buk at al., Svarochnoe proizvodstvo, 3 (1977), 3-4. Acknowledgment – The presented results derive from a scientific research project (Advanced joining technology in light mechanical constructions No. 152-1521473-1476) supported by the Croatian Ministry of Science, Education and Sports. Note: English language lecturer: @eljka Rosandi}, Faculty of Mechanical Engineering, Slavonski Brod, Croatia. METALURGIJA 49 (2010) 4, 325-329 329
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