MIG/MAG welding of carbon steel with rotating arc and Ar/He/O2 gas mixture
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsLaurent Biskup, Gilles Boudet, Jean-Pierre Planckaert, Michel Saez
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Abstract
The invention relates to a ternary gaseous mixture formed from argon, helium and oxygen, characterized in that it is formed from between 19.5 and 20.5% of helium, between 2.7 and 3.3% of Oi, and argon for the remainder (volume %), and to the use thereof as gaseous protection in a method of electric arc welding of at least one steel part to carbon, using a fusible filler wire. Preferably, the welded parts overlap or cover each other and the rotary arc welding takes place where the parts overlap.
Claims10
A process for the electric-arc MIG/MAG welding of at least two carbon steel parts with use of a consumable filler wire, a rotating arc and gas shielding formed of a ternary gas mixture consisting of 19.5 to 20.5% of helium, of 2.7 to 3.3% of O2 and of argon for the remainder (% by volume), wherein the consumable filler wire is melted by the rotating arc so as to obtain metal transfer by rotating liquid vein and the at least two carbon steel parts overlapping or covering one another, the rotating arc welding taking place at said overlap or covering.
Dependencies are inferred from the claim text.