Welding shielding gas flow rate-limiting apparatus

Details Welding shielding gas flow rate-limiting apparatus Welding shielding gas flow rate-limiting apparatus

2006-01-17

2008-12-09

Kerns, Kevin P (Department: 1793)

Electric heating

Metal heating

Nonatmospheric environment at hot spot

Reexamination Certificate

active

07462799

ABSTRACT:
Welding shielding gas is often wasted because the welding operator sets flow rates excessively high. The flow rate limiting apparatus described can be added externally to a needle valve flow control adjustment knob in a flow control device. It is connected such that it limits the degree of allowable movement of the flow control knob. It can be locked with a key type tool to prevent changes. Even when the maximum flow is set and locked, the flow can still be lowered by the operator from the maximum allowable flow setting. This ability allows the operator to adjust flow for differing needs and may further decrease gas usage. Eliminating the ability to set excessively high flow rates also prevents the creation of turbulent flow exiting the shielding gas nozzle or cup thereby eliminating air entrainment into the shielding gas stream improving weld quality.

REFERENCES:
patent: 6390134 (2002-05-01), Hanby
patent: 6610957 (2003-08-01), Uttrachi
patent: 7015412 (2006-03-01), Uttrachi
patent: 7019248 (2006-03-01), Uttrachi
Standifer;Shielding Gas Consumption Efficency; The Fabricator; Jun. 2000; p. 27,col. 2&3 & p. 28 col. 3; vol. 30, # 6;Croydon Group, Rockford,IL.
Weber; How to save 20% on weld costs;Trailer Body Builders; Jan. 2003; p. 46 col. 3; vol. 44, #3; PRIMEDIA, NY, NY.
Instrutions on use of Hanby patent device from Internet site; http://www.surgeandsave.com printed on Jan. 6, 2006.
Product description of Flow Limiting Knob from Internet site: http://www.smitheqipment.com/ products/regul/flowmeters.htm printed on Jan. 6, 2006.

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