Effect of GMAW Process Parameters and Heat Input on Weld Overlay of Austenitic Stainless Steel 316L-Si

• Published in: Soldagem & Inspeção Vol. 28; p. 1
• Main Authors: Souto, Joyce Ingrid Venceslau de, Ferreira, Suzana Dantas, Lima, Jefferson Segundo de, Castro, Walman Benicio de, Grassi, Estephanie Nobre Dantas, Santos, Tiago Felipe de Abreu
• Format: Journal Article
• Language: English
• Published: Sao Paulo Associacao Brasileira de Soldagem 2023; Associação Brasileira de Soldagem
• Subjects: Austenitic stainless steels; Austenitizing; Complex variables; Confidence limits; Cost analysis; Delta ferrite; Design of experiments; Dilution; Electrochemical analysis; Gas metal arc welding; METALLURGY & METALLURGICAL ENGINEERING; Microstructural analysis; Peninsulas; Process parameters; Silicon substrates; Stainless steel; Weld metal; Welding parameters; Heat input; Stainless steel 316LSi; GMAW process; DoE
• ISSN: 0104-9224; 1980-6973; 1980-6973
• DOI: 10.1590/0104-9224/si28.09

Overlay welding with stainless steels has gained attention in several sectors of industry by increasing the mechanical and electrochemical properties of surfaces, in order to obtain them using lower cost substrates. However, the control of welding parameters can become complex due to the multiple control variables, being of interest to obtain deposits with greater productivity. In this context, the objective of this paper is to analyze the effect of the heat input on weld overlays of austenitic stainless steel 316L-Si obtained by the GMAW process, to determine the best welding conditions. For this, a Design of Experiments was implemented to analyze the response variables, which include heat input, reinforcement, width, dilution and hardness of the weld metal. The models were considered significant, presenting R2>0.9 for all responses, based on a 95% confidence limit. Surface graphs indicated influence of welding speed or/and voltage for all responses, in addition to the results demonstrating optimal parameters for overlays such as high ratio between reinforcement and width (0.631), and low dilution values (8.81%). The microstructural analysis indicated the presence of residual γ-austenite and δ-ferrite in all samples, and also the formation of peninsulas and islands, added to defects such as voids, for some weld deposits.