Influence of Cellulosic Fluxes on the Chemical Composition, Microstructure, Inclusions and Micro-Hardness of SMAW Multi-Pass Welds of X42 Steel

• Published in: Solid state phenomena Vol. 297; pp. 62 - 70
• Main Authors: Saoudi, Adel, Khamouli, Farida, Digheche, Kaltoum, Zidani, Mosbah, Atoui, L'Hadi
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.09.2019
• Subjects: Base metal; Carbon content; Chemical composition; Electrodes; Fluxes; Microhardness; Microstructure; Nonmetallic inclusions; Organic chemistry; Shielded metal arc welding; Silicon dioxide; Titanium; Titanium dioxide; Welded joints; Inclusion; Welding; Chemical Composition; Steel; Microstructure; Cellulosic Flux
• ISSN: 1012-0394; 1662-9779; 1662-9779
• DOI: 10.4028/www.scientific.net/SSP.297.62

This paper studied the influence of cellulosic flux on the chemical composition, microstructure, formation of inclusions and micro hardness of X42 welded steel. The chemical compositions of the used fluxes are FA: E6010 and FB: E8010-P1, with electrodes has low carbon content. The welding conditions are not constant. The fluxes (FA and FB) have a high content of TiO2 and SiO2 and a low Ti and Si content was also detected in the internal (P1) and external (P3) passes. But there was an increase in the Ti content in the fusion zone (P1, P2 and P3) of the different passes gradually, compared to the base metal. The microstructure of the fusion zone (P1, P2 and P3) for each flux is mainly composed of acicular ferrite. The mass concentration variation of Mn is more elevated through the centers of the fusion zone passes (P1, P2 and P3) with the used fluxes. White and black non-metallic inclusions are observed, regardless of used flux. The micro-hardness in fusion zone varies according to the variation of the equivalent carbon in the different electrodes.