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Title: Role of beam absorption in plasma during laser welding

Abstract

The relationship between beam focus position and penetration depth in CW laser welding was studied numerically and experimentally for different welding conditions. Calculations were performed using a transient hydrodynamic model that incorporates the effect of evaporation recoil pressure and the associated melt expulsion. The simulation results are compared with measurements made on a series of test welds obtained using a 1650 W CO{sub 2} laser. The simulations predict, and the experiments confirm, that maximum penetration occurs with a specific location of the beam focus, with respect to the original sample surface, and that this relationship depends on the processing conditions. In particular, beam absorption in the plasma has a significant effect on the relationship between penetration and focus position. When the process parameters result in strong beam absorption in the keyhole plasma, the maximum penetration will occur when the laser focus is at or above the sample surface. In a case of weak absorption however, the penetration depth reaches its maximum value when the beam focus is located below the sample surface. In all cases, the numerical results are in good agreement with the experimental measurements.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755598
Report Number(s):
SAND2000-1209J
TRN: AH200021%%45
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
J. Phys. D: Appl. Phys.
Additional Journal Information:
Other Information: Submitted to J. Phys. D: Appl. Phys.; PBD: 15 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LASER WELDING; HEAT AFFECTED ZONE; DEPTH; ENERGY ABSORPTION; FOCUSING; LASER RADIATION; PERFORMANCE; MATHEMATICAL MODELS

Citation Formats

SEMAK,V.V., STEELE,R.J., FUERSCHBACH,PHILLIP W., and DAMKROGER,BRIAN K. Role of beam absorption in plasma during laser welding. United States: N. p., 2000. Web. doi:10.1088/0022-3727/33/10/307.
SEMAK,V.V., STEELE,R.J., FUERSCHBACH,PHILLIP W., & DAMKROGER,BRIAN K. Role of beam absorption in plasma during laser welding. United States. doi:10.1088/0022-3727/33/10/307.
SEMAK,V.V., STEELE,R.J., FUERSCHBACH,PHILLIP W., and DAMKROGER,BRIAN K. Mon . "Role of beam absorption in plasma during laser welding". United States. doi:10.1088/0022-3727/33/10/307. https://www.osti.gov/servlets/purl/755598.
@article{osti_755598,
title = {Role of beam absorption in plasma during laser welding},
author = {SEMAK,V.V. and STEELE,R.J. and FUERSCHBACH,PHILLIP W. and DAMKROGER,BRIAN K.},
abstractNote = {The relationship between beam focus position and penetration depth in CW laser welding was studied numerically and experimentally for different welding conditions. Calculations were performed using a transient hydrodynamic model that incorporates the effect of evaporation recoil pressure and the associated melt expulsion. The simulation results are compared with measurements made on a series of test welds obtained using a 1650 W CO{sub 2} laser. The simulations predict, and the experiments confirm, that maximum penetration occurs with a specific location of the beam focus, with respect to the original sample surface, and that this relationship depends on the processing conditions. In particular, beam absorption in the plasma has a significant effect on the relationship between penetration and focus position. When the process parameters result in strong beam absorption in the keyhole plasma, the maximum penetration will occur when the laser focus is at or above the sample surface. In a case of weak absorption however, the penetration depth reaches its maximum value when the beam focus is located below the sample surface. In all cases, the numerical results are in good agreement with the experimental measurements.},
doi = {10.1088/0022-3727/33/10/307},
journal = {J. Phys. D: Appl. Phys.},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}