Laser/arc hybrid welding process for ferritic steels
AssigneesL'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude, La Soudure Autogene Francaise
InventorChristian Bonnet
Life of this patent
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Abstract
A method and an apparatus for a hybrid laser beam and electric arc welding process. A laser beam, an electric arc, a shielding gas and a consumable welding wire are used to create a weld on a steel work piece by melting the welding wire. The weld contains 30 to 1000 ppm titanium by weight, at least 0.7% manganese by weight, 50 to 1000 ppm oxygen by weight, and less than 10% nickel. The welding wire is either solid welding wire or cored welding wire, and may contain, in varying percentages: titanium, manganese, iron, nickel, boron, molybdenum, carbon or chromium.
Claims20
A method for welding at least one ferritic steel workpiece with a laser beam and an electric arc that are combined together, said method comprising:
- a) supplying a consumable welding wire and a shielding gas;
- b) melting said consumable welding wire with the laser beam and the electric arc that are combined together;
- and
- c) producing a weld on the at least one ferritic steel workpiece, in the presence of said shielding gas mixture, wherein said weld comprises:
- 1) titanium in an amount, by weight, of about 30 ppm to about 1000 ppm;
- 2) manganese in an amount, by weight, of at least 0.7%;
- 3) oxygen in an amount, by weight, of about 50 ppm to about 1000 ppm;
- 4) nickel in an amount, by weight, of less than about 10%;
- 5) wherein said weld further comprises aluminum in an amount, by weight, of less than about 1500 ppm, the ratio of the amount of aluminum in said weld to the amount of oxygen in said weld, by weight, being less than about 2.5, and
- 6) wherein the microstructure of said weld is rich in acicular ferrite.
Dependencies are inferred from the claim text.