Electric heating – Metal heating – Nonatmospheric environment at hot spot
Reexamination Certificate
2006-10-31
2006-10-31
Kerns, Kevin P. (Department: 1725)
Electric heating
Metal heating
Nonatmospheric environment at hot spot
Reexamination Certificate
active
07129436
ABSTRACT:
A welding chamber having a laminar-vortex inert gas flow is disclosed. The welding chamber comprises a transparent dome that covers an open top side of a rigid generally rectanguloid enclosure. The dome includes a one-way vent for discharging ambient air from within the chamber while preventing the introduction of ambient air into the chamber. The enclosure includes a bottom and side walls that are joined at smooth, curved edges, and at least one side wall of the enclosure includes portholes with gloves for manually accessing the interior of the chamber while the dome is in a closed position. At least one gas distribution tube, a plurality of gas inlets and laminar-flow tunnels are included. In use, an inert gas is introduced into the distribution tube that substantially encircles the top of the enclosure. The inert gas is directed downward through the laminar flow tunnels, attached to the side walls of the enclosure, where the gas exits each tunnel with a laminar flow and is directed by the radiused bottom corners of the enclosure from a vertical flow to a horizontal flow across the bottom of the enclosure. As such, the inert gas creates a slow-moving counter-clockwise vortex pattern. In this manner, heavier-than-air argon gas fills the enclosure, displacing ambient air within the chamber, which is forced to rise and exit the chamber through a check valve vent in the top of the dome.
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Corne Joseph E.
Kerns Kevin P.
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