Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
COMPARATIVE ANALYSIS OF METALOGRAPHICAL CHARACTERISTICS OF A SOLDERED ASTM A131 NAVAL STEEL BOARD BY THE E7018 COATED ELECTRODE WITH VARIATION OF THE CABLE DISTANCE OF THE ELECTRODE
Submission Author:
Edgar Matos Santos , SP
Co-Authors:
Antonio Celso Fonseca de Arruda, César Quiroz, Alan Ferreira Pinheiro Tavares, Edgar Matos Santos
Presenter: Edgar Matos Santos
doi://10.26678/ABCM.COBEM2017.COB17-2718
Abstract
Steel, is an iron-carbon alloy, is widely used in the shipbuilding industry, has been replacing wood because it has advantages such as corrosion resistance, ductility and toughness. The process of union of steel more popular is the welding, since it is the most economical, practical and common process and to which it was used in this work. This paper presents the assay of the grains behavior in the Affected Thermally Zone in welding coated electrode. We used a continuous-current source rectifier. The steel in question, is ASTM A131 Grade A, is widely used in the marine industry to build the hulls of boats because it meets the tenacity of -40 ° C for navigation in cold regions and the electrode was the E7018 (Latest version), but has low hydrogen and considerable amounts of iron powder to give more stability to the arc. The variable to consider is the length of the electrode holder cable, ranging from three to one hundred meters. The welds were performed in a shipyard near the city of Manaus, in order to show the current welding situation in the hull of a vessel. Often welders can not move the rectifier sources to be welded and then to a solution, only change the length of the electrode holder for larger, to reach the destination without the regular welding amperage, as a result there is a deposition of variation In Fusion Zone (ZF) and, consequently, the behavior of HAZ microstructure, and where the study was made. Analysis of HAZ was made by metallographic tests in both welded joints and the results of the micrographs, was made a comparison between the welded joints with three meters and a hundred meters.
Keywords
welding, Electrode, coated, HAZ, Microstructure, Metallography
