Characterization of the AWS 317l weld overlay applied by twin wire GMAW on ASTM A516 Gr 60 steel used in oil and gas industry

Abstract

The aim of this study was to evaluate the metallurgical characteristics of weld overlay applied by Twin Wire GMAW process nd the AWS E317L filler metal on ASTM A 516 Gr 60 base metal. During welding it was employed two levels of heat input (H = 1170kJ/m and H = 1530kJ/m) and a mixture of argon and oxygen (95% Ar and 5% O2) as shielding gas. Besides, all welds were carried ut without preheat, however, an interpass temperature of 150°C was used. Then, the specimens were characterized using optical icroscopy and microhardness tests. The results showed an increase in dilution and heat affect zone extension when the heat input ncreases. Moreover, there was also the formation of partially diluted zones (PDZ) along the fusion line, presenting values above 300HV. The formation of PDZ was larger for the highest heat input level.