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A MATHEMATICAL MODEL TO INVESTIGATE UNDERCUTTING AND TO OPTIMIZE WELD QUALITY

Award Information

Agency:
National Aeronautics and Space Administration
Branch:
N/A
Award ID:
11933
Program Year/Program:
1990 / SBIR
Agency Tracking Number:
11933
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
CFD Research Corporation
215 Wynn Dr., 5th Floor Huntsville, AL 35805-
View profile »
Woman-Owned: Yes
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1990
Title: A MATHEMATICAL MODEL TO INVESTIGATE UNDERCUTTING AND TO OPTIMIZE WELD QUALITY
Agency: NASA
Contract: N/A
Award Amount: $50,000.00
 

Abstract:

THE PROPOSED RESEARCH IS AIMED AT PROVIDING PLAUSIBLE EXPLANATION(S) FOR THE UNDERCUTTING FEATURE OF WELDS. A MATHEMATICAL MODEL WILL BE DEVELOPED TO SIMULATE WELD POOL MOTION. PARTICULAR EMPHASIS WILL BE PLACED ON THE VARIATION OF SURFACE TENSION WITH TEMPERATURE AND LOCAL CONCENTRATIONS OF OXYGEN AND OTHER IMPURITIES WHICH MAY DIFFUSE UP TO THE WELD POOL SURFACE THROUGH SHIELD GAS. SPATIAL VARIATION OF CONCENTRATION, WHICH IS EXPECTED TO BE QUITE SIGNIFICANT, WILL BE PROPERLY ACCOUNTED FOR. SUCH VARIATION HAS A POTENTIAL OF CAUSING SECONDARY EDDIES IN THEWELD POOL AND HENCE, THE UNDERCUTTING FEATURE ON THE SURFACE. IN PHASE I, THE MODEL WILL BE DEVELOPED BY ADAPTING AN EXISTING CFD CODE, AND A PARAMETRIC STUDY WILL BE PERFORMED TO ESTABLISH THE PROOF-OF-THE-CONCEPT. IN PHASE II, THE ADAPTED CODE WILL BE IMPROVED, VALIDATED, AND DOCUMENTED FOR ITS WIDE USE IN NASA AND THE WELDING INDUSTRY.

Principal Investigator:

Clifford E. Smith
Mgr./application Projects
2055366576

Business Contact:

Ashok k. singhal
PRESIDENT & TECHNICAL DIRECTOR
2055366576
Small Business Information at Submission:

Cfd Research Corpon
3325-d Triana Boulevard Huntsville, AL 35805

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No