Microstructural and Residuals Stress Analysis of Friction Stir Welding of X80 Pipeline Steel Plates Using Magnetic Barkhausen Noise

• Published in: Journal of nondestructive evaluation Vol. 38; no. 4; pp. 1 - 9
• Main Authors: Avila, J. A., Conde, F. F., Pinto, H. C., Rodriguez, J., Grijalba, F. A. F.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-12-2019; Springer Nature B.V
• Subjects: Arc welding; Barkhausen effect; Butt joints; Butt welding; Characterization and Evaluation of Materials; Classical Mechanics; Control; Dynamical Systems; Engineering; Friction stir welding; Hardness; High strength low alloy steels; Microstructure; Noise; Quality control; Residual stress; Solid Mechanics; Steel plates; Stress analysis; Structural steels; Vibration; Welded joints; X-ray diffraction; X-ray diffraction; X80 pipeline steel; Friction stir welding; Magnetic Barkhausen noise; Residual stress
• ISSN: 0195-9298; 1573-4862
• DOI: 10.1007/s10921-019-0625-2

Friction stir welding is a solid-state joining method conducted under large stress and strain conditions at low peak temperatures when compared to arc welding. Friction stir welding produces a large variety of microstructures and a M-shaped residual stress line profile along the cross-section of the welds. In this work, we present the use of magnetic Barkhausen noise to qualitatively assess the residual stress profile along the transverse direction of a two-pass friction stir welding butt joint on a X80 pipeline steel. Results were compared and correlated to X-ray diffraction, microstructural and hardness characterization. The peak position and the root mean square profiles of the magnetic Barkhausen noise reproduced the residual stress profile obtained by X-ray diffraction and the hardness profile, respectively. These results can be used for developing a qualitative quality control method for friction stir welding joints in other steels.