Influence of active flux on geometry and corrosion resistance of welded joint

Cilj ovog završnog rada jest utvrditi utjecaj aktivacijskog premaza na geometriju i korozijsku otpornost zavarenog spoja austenitnog visokolegiranog nehrđajućeg čelika. Za zavarivanje je odabran TIG postupak bez dodatnog materijala. U teorijskom dijelu rada opisani su konvencionalni TIG i A-TIG postupak zavarivanja. Analizirani su aktivacijski premazi te mehanizam njihova djelovanja koji dovodi do povećane penetracije. Također je razjašnjen njihov sastav i dani su primjeri njihove uporabe u proizvodnji i dostupnost. U eksperimentalnom dijelu rada navareni su uzorci AISI 304 čelika konvencionalnim TIG i A-TIG postupkom te su ispitivana i uspoređena geometrijska i korozijska svojstva od svakog uzorka. Analizom rezultata ocijenjena je podobnost primjene aktivacijskog premaza obzirom na postignuta svojstva kao i na ekonomsku isplativost.The aim of this final paper is to determine the effect of activation coating on the geometry and corrosion resistance of a welded joint of austenitic high alloy stainless steel without the use of additional material. For welding, the TIG process with no additional material was selected. The theoretical part describes the conventional TIG and A-TIG welding process. Active fluxes and the mechanism of their action leading to increased penetration are analyzed. Their composition has also been clarified and examples of their use in production and availability are given. In the experimental part of the paper, samples of AISI 304 steel were welded by conventional TIG and A-TIG process and the geometric and corrosion properties of each sample were tested and compared. The analysis of the results evaluated the suitability of the application of the activation coating in view of the achieved properties as well as the economic cost- effectiveness