Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Pre and post welding geometric deviation measurement method in stainless steel 304 welded by FCAW
Submission Author:
Alexandre de Oliveira Dias , SP
Co-Authors:
Alexandre de Oliveira Dias, Bruno Gabriel Carneiro, Rafael Antônio Pereira Fonseca, RAPHAEL SILVA LINS, Marcilio Alves
Presenter: RAPHAEL SILVA LINS
doi://10.26678/ABCM.COBEM2023.COB2023-1863
Abstract
The flux cored arc welding (FCAW) of stainless steels, due to the high rate of deposition properties and excellent resistance to impact, is possible to be applied in many industrial sectors, such as the food, chemical, and petrochemical industries, especially in equipment subject to cryogenic temperatures. Faced with this demand, this article intends to demonstrate a method of quality control in test specimens of stainless steel 304 in welding by the flux-cored wire process. The method consists of tracing specific points (X, Y) along the surface of the specimen in order to monitor deviations in flatness, straightness, and punctuality of the material before and after welding with simple deposition of a weld bead. In measurements related to the plane, a mesh with 36 points was measured. It was possible to acquire flatness, angle of inclination, squareness (ZX and YZ), and parallelism (XY), both in their respective reference lengths. In line-related measurements, 12 points were measured on a line 10mm away from one of the lateral vertices of the specimen. Thirty specimens measuring 5/8 inch x 6 inch x 2 inches were analyzed. By superimposing these surfaces, using computer-aided design (CAD) software, it was possible to quantify the deviations and verify which variables of the welding process most affected these shape deviations. The weld beads were centered and had approximate lengths of 2 inches, the welding was carried out in the flat position using a Gullco welding carriage. Voltage and current data were acquired during the process. The mass of the test specimens was weighed before and after welding, as well as the real length of the bead and the geometry (width and reinforcement). The method proved to be efficient to verify geometric deviations in scientific welding experiments and aims to demonstrate that preparatory welding methods have an influence on post-welding characteristics. The length of the weld has a strong influence on deformations since the welding energy remained constant.
Keywords
FCAW, AISI 304, E316LT1-1, Welding deformation, MMC
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