Gas composition for arc welding
AssigneePraxair Technology, Inc.
InventorsWilliam de Abreu Macêdo, Joáo Vinicius de Oliveira Correia
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Abstract
The disclosed invention is a composition and process for employing a shielding gas in arc welding. The disclosed composition includes oxygen in an amount between about 0.6% and about 1.9%, helium in an amount between about 10% and about 24%, and the remainder consisting essentially of argon. The invention can be used in high-speed automated welding to result in significantly improved welding speed, joint fit-up tolerance, and burn-through minimization while maintaining excellent mechanical characteristics.
Claims8
A high speed method for gas metal arc welding joint gaps on aluminum and aluminum alloy thin workpieces without creating burning-through, which comprises conducting said gas metal arc welding employing a shielding gas, wherein said shielding gas comprises:
- a) oxygen in an amount between about 0.6% and about 1.9%;
- b) helium in an amount between about 10% and about 24%;
- and
- c) the remainder consisting essentially of argon;
- and employing direct current or alternating current to generate the arc;
- wherein the amount of helium is sufficient to provide a bead size that can weld joint gaps between said aluminum arid aluminum alloy thin workpieces without creating burn-through, while simultaneously maintaining or increasing welding speed, and wherein the welding speed is greater than about 110 cm/min for gas metal arc welding employing direct current to generate the arc, and greater than about 105 cm/min for gas metal arc welding employing alternating current to generate the arc.
Dependencies are inferred from the claim text.