Weldpool flow visualization studies during gas tungsten arc welding of steel and aluminum.
Schupp, Peter E.
MetadataShow full item record
A flow visualization study of current distribution effects on weld pool stirring in GTA steel welds is presented using a pulsed ultraviolet laser vision system. Weld pool stirring is almost eliminated in HY-80 steel by the use of symmetric current flow path within the weld samples. Periodic radial surface pulses are observed at low currents in stationary welds while flows of turbulent nature are observed at higher currents. Autogenous welds on 17.75 cm by 28.0 cm by 1.27 cm thick 6061 aluminum plates are also studied to determine resulting surface flow characteristics and weld pool growth rates. Clockwise stirring in conjunction with a vertical undulation is noted in stationary welds. Solidified weld zone exhibits a profound crater that was not present in welds on HY-80 steel.
Showing items related by title, author, creator and subject.
Espinosa, Daniel C. (Monterey, California. Naval Postgraduate School, 1991-09);Surface flow visualization of Gas Tungsten Arc weld pools for HY-80 steel is presented using a pulsed laser light source and a conventional night-vision image-intensif ier tube equipped video camera. Visualization of ...
Microstructure characterization of friction-stir processed nickel-aluminum bronze through orientation imaging microscopy Cuevas, Assunta Mariela. (Monterey, California. Naval Postgraduate School, 2002-09);The effect of friction-stir processing (FSP) on the microstructure of a cast nickel-aluminum bronze (NAB) material has been characterized by various micro-analytical methods including orientation imaging microscopy (OIM). ...
Harcourt, Ramsey; Jiang, Lin; Garwood, Roland W. (1997-02); NPS-OC-98-001This report describes numerical simulation of two types of idealized drifters: pure Lagrangian drifters and the isobaric drifters. A large-eddy (LES) model was used to predict the fully-turbulent non-hydrostatic evolution ...