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Residual stress analysis in AISI 347L steel coating welding on Cr-Mo steel using coordinate measurement method

ABSTRACT

This study evaluated the quality of AISI 347L stainless steel coating on Cr-Mo steel substrate produced by GMAW process, considering the influence of welding parameters and stress-relieving heat treatments. The Coordinated Point Displacement (CPD) method was used for residual stress analysis. Three (3) specimens with dimensions of 300 × 150 × 12.7 mm were fabricated with variations in shielding gas composition (100% Ar, 98% Ar + 2% CO2, and 96% Ar + 4% CO2), and post-weld heat treatments were performed following ASME BPVC VIII standard. Optical microscopy, macrographic examination, and hardness testing were performed to evaluate the microstructure of the coating. The results indicate that the stress-relieving heat treatments effectively reduce residual stresses and improve coating quality. Optical microscopy analysis revealed a homogeneous microstructure without cracks or porosity, indicating satisfactory performance of the GMAW process. These test results are important for qualifying the welding process and ensuring the quality of the coating in practical applications.

Keywords
GMAW; AISI 347L; Residual Stress; Displacement Coordinate Points Method (DCP)

Laboratório de Hidrogênio, Coppe - Universidade Federal do Rio de Janeiro, em cooperação com a Associação Brasileira do Hidrogênio, ABH2 Av. Moniz Aragão, 207, 21941-594, Rio de Janeiro, RJ, Brasil, Tel: +55 (21) 3938-8791 - Rio de Janeiro - RJ - Brazil
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