Electric heating – Metal heating – Nonatmospheric environment at hot spot
Reexamination Certificate
2007-01-09
2007-01-09
Tran, Len (Department: 1725)
Electric heating
Metal heating
Nonatmospheric environment at hot spot
C219S13700R
Reexamination Certificate
active
10868888
ABSTRACT:
This invention relates to a method for gas metal arc welding of coated steels, and a shielding gas therefor, in which the method comprises:(a) forming an arc between a consumable wire electrode and a coated steel workpiece;(b) maintaining a substantially constant arc voltage between said consumable wire electrode and the coated steel workpiece;(c) feeding the consumable wire electrode through a welding torch contact tube into said arc;(d) transferring metal from the consumable wire electrode to the coated steel workpiece; and(e) shielding the arc with a gas mixture consisting essentially of:(i) from 6 to 10 volume percent carbon dioxide;(ii) from 6 to 10 volume percent helium; and(iii) the balance argon.
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William de Abreu Macedo et al., “Optimized Welding Consumables for Joining Coated Steels”, presented at the 1998 AWS International Welding and Fabricating Exposition, Detroit, MI.
Kevin A. Lyttle, “Pulsed Metal-Cored Wires for Coated Steels” presented at the 2000 AWS Exposition and Convention; St. Louis, MO.
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Lyttle Kevin A.
Neff Jeremy B.
Coon Gerald L.
Praxair Technology Inc.
Tran Len
LandOfFree
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