NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Keyhole and weld shapes for plasma arc welding under normal and zero gravityA first order study of the interfacial (keyhole) shape between a penetrating argon plasma arc jet and a stationary liquid metal weld pool is presented. The interface is determined using the Young-Laplace equation by assuming that the plasma jet behaves as a one-dimensional ideal gas flow and by neglecting flow within the weld pool. The solution for the keyhole shape allows an approximate determination of the liquid-solid metal phase boundary location based on the assumption that the liquid melt is a stagnant thermal boundary layer. Parametric studies examine the effect of plasma mass flow rate, initial plasma enthalpy, liquid metal surface tension, and jet shear on weldment shape under both normal and zero gravity. Among the more important findings of this study is that keyhole and weld geometries are minimally affected by gravity, suggesting that data gathered under gravity can be used in planning in-space welding.
Document ID
19910054168
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Keanini, R. G.
(California Univ. Berkeley, CA, United States)
Rubinsky, B.
(California, University Berkeley, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Mechanical Engineering
Meeting Information
Meeting: AIAA/ASME Thermophysics and Heat Transfer Conference
Location: Seattle, WA
Country: United States
Start Date: June 18, 1990
End Date: June 20, 1990
Sponsors: ASME
Accession Number
91A38791
Funding Number(s)
CONTRACT_GRANT: NAS1-18686
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available