Estudo microestrutural de a？o carbono soldado com o processo arco submerso e adi？？es de Fe-Ti

the welds usually have a coarse columnar structure, which reduces the mechanical properties of welded assembly. in the case of submerged arc welding, the use of high-energy provides a weld with specific characteristics such as high melting rate and consequently a large volume of molten metal. it was established that the reduction in size and/or changes in the shape of the crystals obtained increases the toughness of the weld. studies have shown that the addition of titanium to a certain limit, modify the microstructure obtained and the size of the grains solidified. in this study, we used an alloy of fe-ti added at the time of welding-type bead-on-plate on structural steel astm a 36 with a thickness of 10 mm. the additions of titanium ranged between 0.48 ppm and 29.1 ppm, and welding was performed with an energy of 1170 kj/m the results showed changes in the phase acicular ferrite and polygonal ferrite present in the weld.