Process for the MIG welding of nickel and nickel alloys with a shielding gas based on argon and CO2

US6596971B1 · kind B1 · utility

Assignee

• L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude · FR

Inventors

• Laurent Biskup · Valognes, FR
• Didier Marchand · Saint-Germain-en-Laye, FR
• Jean-Marie Fortain · Osny, FR
• Jean-Yves Mouton · Cergy, FR

Key dates

• Filing date: Sep 6, 2001
• Grant date: Jul 22, 2003
• Expiry date: Sep 6, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K9/173
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Process for the MIG welding of nickel and nickel alloys, with the use of a gas shield for at least part of the welding zone, in which process the gas shield is a gas mixture containing from 0.05% to 0.5% CO2, the balance being argon. Advantageously, the gas mixture also contains, by volume, from 15 to 50% helium, preferably from 17% to 30% helium, or from 0.1% to 10% hydrogen by volume and preferably from 1% to 7% hydrogen by volume.