Electric heating – Metal heating – Nonatmospheric environment at hot spot
Reexamination Certificate
2006-03-28
2006-03-28
Johnson, Jonathan (Department: 1725)
Electric heating
Metal heating
Nonatmospheric environment at hot spot
C219S075000
Reexamination Certificate
active
07019248
ABSTRACT:
These shielding gas flow-control devices avoid weld start quality problems often created in typical GMAW systems. They accomplished this while maintaining the common high pressure gas delivery pressures. Higher pressures maintain automatic flow compensation when gas restrictions occur while welding. A measured amount of extra shielding gas is quickly delivered at the weld start to displace air that enters the welding torch body and cable when welding is stopped. They also provide extra gas to purge the air in the weld start area. The extra gas is provided without excess gas flow velocity that, if present, causes air to be pulled into the shielding gas stream. These unique devices control gas flow while being located in, on or in close proximity to the wire feeder. A simple method of limiting gas flow adjustment is also included. These systems also minimize shielding gas waste which often occurs at the weld start.
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Weber; How to save 20% on weld costs; Trailer Body Builders; Jan. 2003; pp. 46 to 50; (pp. 46 relevant); vol. 44, # 3; Primedia, NY, NY.
Standifer; Shielding Gas Consumtion Efficiency; The Fabricator; Jun. 2000; pp 26 to 29; vol. 30, # 6; Croydon Group, Rockford, IL.
Beveridge Rachel E.
Johnson Jonathan
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