A MATHEMATICAL MODEL TO INVESTIGATE UNDERCUTTING AND TO OPTIMIZE WELD QUALITY

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 11933
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1990
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
3325-d Triana Boulevard, Huntsville, AL, 35805
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Clifford E. Smith
 Mgr./application Projects
 (205) 536-6576
Business Contact
 ASHOK K. SINGHAL
Title: PRESIDENT & TECHNICAL DIRECTOR
Phone: (205) 536-6576
Research Institution
N/A
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.

* Information listed above is at the time of submission. *

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