The X-ray diffraction (XRD) technique is employed to measure residual stress induced by the laser welding of 6.7 mm thick ASTM A514 high strength steel plates. The distribution of residual stress in the weld bead is investigated. The results indicate that the fusion zone (FZ) has the maximum tensile stress, the transition from tensile to compressive stress tends to appear in the heat affected zone (HAZ), and the initial stress far from the weld center are not influenced by the welding process. Based on the measurement data, the influence of the laser power and the welding speed on residual stress is obtained. The magnitude of residual stress near the weld bead increases with an increase in laser power or a decrease in welding speed. The welds with incomplete penetration have a considerably lower magnitude of residual stress in FZ than ones with full penetration. Post-weld heat treatment is utilized to relieve residual stress in the weld bead. Although residual stress is not completely relieved after the heat treatment, a dramatically reduced magnitude and much more uniform distribution are achieved. In addition, the effects of the laser power, the welding speed, the laser spot diameter, and the gap between two plates on the weld shape are also studied.
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ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference
June 10–14, 2013
Madison, Wisconsin, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-5545-4
PROCEEDINGS PAPER
Residual Stress Analysis and Weld Bead Shape Study in Laser Welding of High Strength Steel
Wei Liu,
Wei Liu
Southern Methodist University, Dallas, TX
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Fanrong Kong,
Fanrong Kong
Southern Methodist University, Dallas, TX
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Radovan Kovacevic
Radovan Kovacevic
Southern Methodist University, Dallas, TX
Search for other works by this author on:
Wei Liu
Southern Methodist University, Dallas, TX
Fanrong Kong
Southern Methodist University, Dallas, TX
Radovan Kovacevic
Southern Methodist University, Dallas, TX
Paper No:
MSEC2013-1102, V001T01A053; 9 pages
Published Online:
November 27, 2013
Citation
Liu, W, Kong, F, & Kovacevic, R. "Residual Stress Analysis and Weld Bead Shape Study in Laser Welding of High Strength Steel." Proceedings of the ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. Volume 1: Processing. Madison, Wisconsin, USA. June 10–14, 2013. V001T01A053. ASME. https://doi.org/10.1115/MSEC2013-1102
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