Uticaj temperature ivice žljeba i unete toplote na strukturu i tvrdoću zone uticaja toplote zavarenog spoja čelika P 460 NL1

Abstract

Polazne strukture i vreme hlađenja u temperaturnom intervalu 800 - 500°C (t8/5) imaju presudan uticaj na strukture i osobine zone uticaja toplote zavarenih spojeva čelika. Na vreme hlađenja t8/5 između ostalog, utiče i temperatura ivice žleba. Zbog zagrevanja toplotom luka temperatura ivice žleba duž spoja raste, zbog čega se vreme hlađenja zone uticaja toplote produžava. Samim tim, duž spoja se produžava i vreme hlađenja t8/5. U radu su prikazani rezultati merenja temperatura ivica žleba pri zavarivanju višeprolaznog sučeonog spoja mikrolegiranog čelika P 460 NL1. Određen je uticaj ovih temperatura na vremena hlađenja t8/5 i na makro i mikrostrukture i tvrdoće u zoni uticaja toplote ovog zavarenog spoja.

The starting structures and cooling times in the temperature range 800 - 500°C (t8/5) have a decisive influence on the structures and properties of the heat affected zone of steel welded joints. At the cooling time t8/5, inter alia, the groove edge temperature has an effect. Due to heating by the electrical arc, the groove edge temperature along the joint, increases, resulting in extending of the cooling time of the heat affected zone. Therefore, the cooling time t 8/5 is extended along the joint. The paper presents the measurement results of the groove edges temperature during the welding of the multilayer joint of the microalloyed steel P 460 NL1. The influence of these temperatures on the cooling time t8/5 and on the macro and microstructure and hardness in the heat affected zone of this welded joint was determined.