The effect of laser welding process parameters on the mechanical and microstructural properties of V-4Cr-4Ti structural materials.

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This paper reports on a systematic study which was conducted to examine the use of a pulsed Nd:YAG laser to weld sheet materials of V-Cr-Ti alloys and to characterize the microstructural and mechanical properties of the resulting joints. Deep penetration and defect-free welds were achieved under an optimal combination of laser parameters including focal length of lens, pulse energy, pulse repetition rate, beam travel speed, and shielding gas arrangement. The key for defect-free welds was found to be the stabilization of the keyhole and providing an escape path for the gas trapped in the weld. An innovative method was developed ... continued below

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27 p.

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Reed, C.; Natesan, K.; Xu, Z. & Smith, D. June 15, 2000.

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Description

This paper reports on a systematic study which was conducted to examine the use of a pulsed Nd:YAG laser to weld sheet materials of V-Cr-Ti alloys and to characterize the microstructural and mechanical properties of the resulting joints. Deep penetration and defect-free welds were achieved under an optimal combination of laser parameters including focal length of lens, pulse energy, pulse repetition rate, beam travel speed, and shielding gas arrangement. The key for defect-free welds was found to be the stabilization of the keyhole and providing an escape path for the gas trapped in the weld. An innovative method was developed to obtain deep penetration and oxygen contamination free welds. Oxygen and nitrogen uptake were reduced to levels only a few ppm higher than the base metal by design and development of an environmental control box. Effort directed at developing an acceptable postwelding heat treatment showed that five passes of a diffuse laser beam over the welded region softened the weld material, especially in the root region of the weld.

Physical Description

27 p.

Notes

INIS; OSTI as DE00757508

Medium: P; Size: 27 pages

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  • Other Information: PBD: 15 Jun 2000

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  • Report No.: ANL/TD/TM00-13
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/757508 | External Link
  • Office of Scientific & Technical Information Report Number: 757508
  • Archival Resource Key: ark:/67531/metadc708838

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 15, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 6:39 p.m.

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Reed, C.; Natesan, K.; Xu, Z. & Smith, D. The effect of laser welding process parameters on the mechanical and microstructural properties of V-4Cr-4Ti structural materials., report, June 15, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc708838/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.