Weldpool flow visualization studies during gas tungsten arc welding of steel and aluminum.
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Authors
Schupp, Peter E.
Subjects
Welding
Arc
Modeling
Flow Visualization
Fusion zone
Stirring
Arc
Modeling
Flow Visualization
Fusion zone
Stirring
Advisors
Joshi, Yogendra
Date of Issue
1992-03
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funding
Format
58 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.