Electric heating – Metal heating – By arc
Patent
1992-07-15
1993-07-06
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912154, 219137R, 21912157, B23K 900
Patent
active
052256545
ABSTRACT:
A plasma arc welding process for welding metal of increased thickness with one pass includes operating the plasma arc welding apparatus at a selected plasma gas flow rate, travel speed and arc current, to form a weld having a penetration ratio to weld height to weld width, and maintaining the penetration ratio at less than 0.74. Parameters for the plasma gas flow rate, travel speed and arc current are adjusted to a steady state condition during a start up period and maintained during the steady state condition to complete a weld. During a terminal stopping period, the travel speed is stopped and instantaneously replaced by filler wire which adds material to fill the keyhole that had been formed by the welding process. Parameters are subsequently adjusted during the stopping period to terminate the weld in a sound manner.
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patent: 4918283 (1990-04-01), Yamade et al.
patent: 5045667 (1991-09-01), Iceland et al.
W. Lucas, TIG and Plasma Welding, Abington Publishing, England, Ch. 8 & 9, 1990.
R. L. O'Brien, Welding Handbook-Welding Processes, vol 2, 8th Ed., American Welding Society, Ch. 10, Plasma Arc Welding, 1991.
Oral Presentation to NASA and Aerojet Corp. on Jun. 20, 1991.
Fisher Walter J.
Harwig Dennis D.
Hunt James F.
Ryan Patrick M.
Edwards Robert J.
Kalka Daniel S.
Matas Vytas R.
Paschall Mark H.
The Babcock & Wilcox Company
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