Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYSIS OF HEAT INPUT INFLUENCE IN AUSTENITIC STAINLESS STEEL PLATES WELDED BY SMAW PROCESS
Submission Author:
Tabatta Regina de Brito Martins , RJ
Co-Authors:
Tabatta Regina de Brito Martins, Joao Alex Mattos
Presenter: Tabatta Regina de Brito Martins
doi://10.26678/ABCM.COBEM2019.COB2019-2042
Abstract
The joining of metals by welding is a manufacturing method widely used because it produces a resistant and versatile bond as it can be applied in various materials and conditions. Stainless steel is used in several projects, where many of these involves welding, because it shows excellent resistance to corrosion, excellent mechanical strength and good weldability compared to carbon steels. The SMAW process is mainly employed in repair operations in the field. So that, in this work the influence of the heat input on the quality of the similar joint of stainless steel AISI 316 plate with 309-L covered electrode weld by SMAW process is studied. The weld joints are examined by the tests of macrography, micrography and microhardness. The joint of the AISI 316 steel is welded with three different heat inputs. There was no significant change in the microhardness along the base metal, the heat affected zone and the weld metal. The heat input had influence in the macrostructures of the test specimens, being proportional to the size of the heat affected zone. In the microstructure, the volumetric fraction of delta ferrite was apparently affected by the thermal input, being greater with the increase of the heat input.
Keywords
austenitic stainless steel, Welding SMAW, Heat Input, Microhardness, Microstructure
