Earl Rodney Colvin

US Patent:

20050072761, Apr 7, 2005

Filed:

Aug 18, 2004

Appl. No.:

10/920332

Inventors:

Earl Colvin - Nuevo CA, US
Jeff Leonard - Murray UT, US
Jeffrey Mitchelson - Fullerton CA, US

International Classification:

B23K009/173

US Classification:

219074000, 21913700R

Abstract:

This invention relates to a method for gas metal arc welding of uncoated steels, and a shielding gas therefor, in which the method comprises: (a) forming an arc between a consumable wire electrode and an uncoated steel workpiece; (b) maintaining a substantially constant arc voltage between said consumable wire electrode and the uncoated 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 uncoated steel workpiece; and (e) shielding the arc with a gas mixture consisting essentially of: (i) from 5 to 9 volume percent carbon dioxide; (ii) from 8 to 12 volume percent helium; and (iii) the balance argon.

US Patent:

49738224, Nov 27, 1990

Filed:

Feb 14, 1990

Appl. No.:

7/480112

Inventors:

James R. Evans - Poughkeepsie NY
Earl D. Colvin - Nuevo CA

Assignee:

Union Carbide Industrial Gases Technology Corporation - Wilmington DE

International Classification:

B23K 9173

US Classification:

219137PS

Abstract:

A welding method and shielding gas therefor which enables the use of gas metal arc welding to produce smooth welds with little or no surface oxidation and without encountering arc instability during the metal deposition.