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Title: Characterization of the residual strains in iterative laser forming
Authors: Knupfer, SM
Paradowska, AM
Kirstein, O
Moore, AJ
Keywords: Neutron diffraction
Welded Joints
Issue Date: 1-Jan-2012
Publisher: Elsevier
Citation: Knupfer, S. M., Paradowska, A. M., Kirstein, O., Moore, A. J. (2012). Characterization of the residual strains in iterative laser forming. Journal of Materials Processing Technology, 212(1), 90-99.
Abstract: In laser forming, thermally induced strains transverse to the laser scan line vary with depth in the material and contribute most significantly to the desired deformation. The through-thickness transverse residual strain distribution was measured by neutron diffraction in laser-formed low carbon steel and aluminium alloy specimens. The specimens were formed with a wide range of laser line energies covering the temperature gradient mechanism (TGM) and shortening or upsetting mechanism (SM), and for single and multi-pass forming (up to 3 laser passes). Below the saturation line energy where the TGM dominates, the gradient of the through-thickness strain distribution was found to increase with increasing line energy and number of laser passes; the gradient decreased again at line energies above the saturation line energy where the efficiency of the TGM decreases. Iterative laser forming can be applied to reduce weld-induced distortions. The peak longitudinal strain measured in the weld seam of a specimen that had been straightened by iterative laser forming was also significantly reduced.(C) 2011 Elsevier B.V. All rights reserved.
ISSN: 0924-0136
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