Efeito do tratamento t??rmico p?3s-soldagem nas propriedades mec?￠nicas e microestruturais de metal de solda de a?§o de extra alta resist?ancia para utiliza?§?￡o em equipamentos de ancoragem

摘要

A weld metal with tensile strength higher than 860 MPa for the welding of a IACS W22 R4 Grade Steel was evaluated. Welded joints with preheat of 200 and 250?oC were produced by SMAW process using 4.0 mm diameter covered electrodes in multipass technique whose basic composition was: C-0,06%, Mn-1,89%, e Ni-2,95%. After welding, mechanical and metallographic tests were done in all-weld metal samples in both as-welded and post welded heat treatment conditions performed at600?oC for 2 hours. The results show that the obtained weld metals have mechanical properties higher than the minimum required for the welding of a IACS W22 R4 Grade steel in all condition analysis, which makes possible to attain an adequate strength/toughness relationship for high strength steel applied in mooring equipments. The metallographic analysis allowed the identification of microstructure and, consequently, the behavior of the mechanical properties after post weld heat treatment.