Laser Assisted Micro Wire GMAW and Droplet Welding

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Description

Laser beam welding is the principal welding process for the joining of Sandia weapon components because it can provide a small fusion zone with low overall heating. Improved process robustness is desired since laser energy absorption is extremely sensitive to joint variation and filler metal is seldom added. This project investigated the experimental and theoretical advantages of combining a fiber optic delivered Nd:YAG laser with a miniaturized GMAW system. Consistent gas metal arc droplet transfer employing a 0.25 mm diameter wire was only obtained at high currents in the spray transfer mode. Excessive heating of the workpiece in this mode ... continued below

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40 pages

Creation Information

FUERSCHBACH, PHILLIP W.; LUCK, D. L.; BERTRAM, LEE A. & ANDERSON, ROBERT A. March 1, 2002.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Laser beam welding is the principal welding process for the joining of Sandia weapon components because it can provide a small fusion zone with low overall heating. Improved process robustness is desired since laser energy absorption is extremely sensitive to joint variation and filler metal is seldom added. This project investigated the experimental and theoretical advantages of combining a fiber optic delivered Nd:YAG laser with a miniaturized GMAW system. Consistent gas metal arc droplet transfer employing a 0.25 mm diameter wire was only obtained at high currents in the spray transfer mode. Excessive heating of the workpiece in this mode was considered an impractical result for most Sandia micro-welding applications. Several additional droplet detachment approaches were investigated and analyzed including pulsed tungsten arc transfer(droplet welding), servo accelerated transfer, servo dip transfer, and electromechanically braked transfer. Experimental observations and rigorous analysis of these approaches indicate that decoupling droplet detachment from the arc melting process is warranted and may someday be practical.

Physical Description

40 pages

Source

  • Other Information: PBD: 1 Mar 2002

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  • Report No.: SAND2002-0701
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/793350 | External Link
  • Office of Scientific & Technical Information Report Number: 793350
  • Archival Resource Key: ark:/67531/metadc738704

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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.

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Creation Date

  • March 1, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

Description Last Updated

  • April 12, 2016, 4:45 p.m.

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FUERSCHBACH, PHILLIP W.; LUCK, D. L.; BERTRAM, LEE A. & ANDERSON, ROBERT A. Laser Assisted Micro Wire GMAW and Droplet Welding, report, March 1, 2002; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc738704/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.