Nondestructive evaluations of thermal deformations for laser microwelding process

Wei Han; Ryszard J. Pryputniewicz

doi:10.1117/12.560273

2 August 2004 Nondestructive evaluations of thermal deformations for laser microwelding process

Wei Han, Ryszard J. Pryputniewicz

Author Affiliations +

Proceedings Volume 5532, Interferometry XII: Applications; (2004) https://doi.org/10.1117/12.560273
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Laser microwelding process produces large temperature gradients during the complicated phase transformations of workpiece materials, which results in a high stress level and undesired thermomechanical deformations. Characterization of these deformations becomes important as they might significantly affect performance, functionality, and reliability of the microwelded components. We have developed an optoelectronic holography (OEH) methodology for nondestructive evaluation of thermomechanical deformations caused by laser microwelding processes. OEH methodology provides a unique experimental approach for quantitative measurements of displacements and deformations with sub-micrometer accuracy in full field of view. In this paper, the OEH methodology is described including illumination of a workpiece, formation and acquisition of images, and processing of these images to determine parameters characterizing laser microwelds. Representative results of the OEH measurements of the deformations caused by laser microwelding of metal sheets are presented as a function of different laser welding parameters. In addition, analytical and computational models are also developed to simulate temperature, thermal stress, and thermal deformation fields in laser microwelding process. The investigations indicate that the OEH methodology is a viable tool for characterization of thermomechanical deformations caused by laser microwelding processes, and can help optimizing laser microwelding processes for high precision material-joining applications.

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Wei Han and Ryszard J. Pryputniewicz "Nondestructive evaluations of thermal deformations for laser microwelding process", Proc. SPIE 5532, Interferometry XII: Applications, (2 August 2004); https://doi.org/10.1117/12.560273

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KEYWORDS

Laser processing

Fringe analysis

Holography

Laser applications

Laser development

Nondestructive evaluation

Image processing

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