SOLDAGEM: avaliação do efeito da dureza da soldagem de aço transformável AISI 4340 por arame tubular (FCAW) utilizando consumível OK TubRad 95K2 com variações de corrente de 260 a 280 A e aplicação de tratamentos térmicos

Abstract

The present work has as main objective the evaluation of the effect on the hardness of the welding of transformable steel AISI 4340 by tubular wire (FCAW), using consumable OK TubRod 95K2 with 1.2 mm in diameter. The tests were carried out using welding currents between 260 and 280 A, another factor evaluated was the effectiveness of the application of thermal treatment of pre and post-heating using temperatures of 300 ° C and 550 ° C, respectively. After welding, hardness tests were performed, and the results were demonstrated in graphs for evaluation. it was seen that this material presented satisfactory behavior when submitted to thermal treatments, however it presented a significant drop in the surface resistance when they were applied.