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Title: Evaluation of weld porosity in laser beam seam welds: optimizing continuous wave and square wave modulated processes.

Abstract

Nd:YAG laser joining is a high energy density (HED) process that can produce high-speed, low-heat input welds with a high depth-to-width aspect ratio. This is optimized by formation of a ''keyhole'' in the weld pool resulting from high vapor pressures associated with laser interaction with the metallic substrate. It is generally accepted that pores form in HED welds due to the instability and frequent collapse of the keyhole. In order to maintain an open keyhole, weld pool forces must be balanced such that vapor pressure and weld pool inertia forces are in equilibrium. Travel speed and laser beam power largely control the way these forces are balanced, as well as welding mode (Continuous Wave or Square Wave) and shielding gas type. A study into the phenomenon of weld pool porosity in 304L stainless steel was conducted to better understand and predict how welding parameters impact the weld pool dynamics that lead to pore formation. This work is intended to aid in development and verification of a finite element computer model of weld pool fluid flow dynamics being developed in parallel efforts and assist in weld development activities for the W76 and future RRW programs.

Authors:
 [1]; ;  [2]; ;
  1. (Honeywell FM&T, Kansas City, MO)
  2. (Honeywell FM&T, Kansas City, MO)
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
902878
Report Number(s):
SAND2007-1051
TRN: US200720%%324
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ASPECT RATIO; COMPUTERS; ENERGY DENSITY; FLUID FLOW; INSTABILITY; LASERS; POROSITY; SHIELDING; STAINLESS STEELS; VAPOR PRESSURE; VELOCITY; VERIFICATION; WELDED JOINTS; WELDING; High energy forming.; Laser welding.; Welding.

Citation Formats

Ellison, Chad M., Perricone, Matthew, Faraone, Kevin M., Roach, Robert Allen, and Norris, Jerome T.. Evaluation of weld porosity in laser beam seam welds: optimizing continuous wave and square wave modulated processes.. United States: N. p., 2007. Web. doi:10.2172/902878.
Ellison, Chad M., Perricone, Matthew, Faraone, Kevin M., Roach, Robert Allen, & Norris, Jerome T.. Evaluation of weld porosity in laser beam seam welds: optimizing continuous wave and square wave modulated processes.. United States. doi:10.2172/902878.
Ellison, Chad M., Perricone, Matthew, Faraone, Kevin M., Roach, Robert Allen, and Norris, Jerome T.. Thu . "Evaluation of weld porosity in laser beam seam welds: optimizing continuous wave and square wave modulated processes.". United States. doi:10.2172/902878. https://www.osti.gov/servlets/purl/902878.
@article{osti_902878,
title = {Evaluation of weld porosity in laser beam seam welds: optimizing continuous wave and square wave modulated processes.},
author = {Ellison, Chad M. and Perricone, Matthew and Faraone, Kevin M. and Roach, Robert Allen and Norris, Jerome T.},
abstractNote = {Nd:YAG laser joining is a high energy density (HED) process that can produce high-speed, low-heat input welds with a high depth-to-width aspect ratio. This is optimized by formation of a ''keyhole'' in the weld pool resulting from high vapor pressures associated with laser interaction with the metallic substrate. It is generally accepted that pores form in HED welds due to the instability and frequent collapse of the keyhole. In order to maintain an open keyhole, weld pool forces must be balanced such that vapor pressure and weld pool inertia forces are in equilibrium. Travel speed and laser beam power largely control the way these forces are balanced, as well as welding mode (Continuous Wave or Square Wave) and shielding gas type. A study into the phenomenon of weld pool porosity in 304L stainless steel was conducted to better understand and predict how welding parameters impact the weld pool dynamics that lead to pore formation. This work is intended to aid in development and verification of a finite element computer model of weld pool fluid flow dynamics being developed in parallel efforts and assist in weld development activities for the W76 and future RRW programs.},
doi = {10.2172/902878},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}

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