Shielding gases for arc welding
AssigneeCanadian Liquid Air Ltd./Air Liquide Canada Ltee
InventorsGrant Harvey, Jocelyn Turcot, Jean-Pierre Larue, Viwek V. Vaidya
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Abstract
A shielding gas for flux cored arc welding. The specific gas combination is intended to promote significantly lower fume emission levels while providing equivalent or better welding performance.
Claims7
A method for gas metal arc welding with a consumable wire electrode, comprising:
- (a) forming an arc between the consumable wire electrode and a workpiece;
- (b) maintaining an arc voltage between said flux cored wire electrode and workpiece;
- (c) transferring metal from the electrode to the workpiece;
- and
- (d) shielding the arc with a gas mixture;
- the improvement comprising providing as said gas mixture approximately 5-15% by volume helium approximately 5-25% by volume carbon dioxide and the remainder argon.
A method for flux cored arc welding with a consumable flux cored wire electrode, comprising:
- (a) forming an arc between the consumable wire electrode and a workpiece;
- (b) maintaining an arc voltage between said flux cored wire electrode and workpiece;
- (c) transferring metal from the electrode to the workpiece;
- and
- (d) shielding the arc with a gas mixture;
- the improvement comprising providing as said gas mixture approximately 5-15% by volume helium approximately 5-25% by volume carbon dioxide and the remainder argon.
A shielding gas for flux cored arc welding with a consumable flux cored wire electrode comprising a gas mixture of approximately 5-15% by volume helium, approximately 5-25% by volume carbon dioxide and approximately 60-90% by volume argon.
Dependencies are inferred from the claim text.