Shielding gas for electric arc welding
AssigneeBOC Limited
InventorDerrick E. Hilton
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Abstract
A shielding gas for use in electric arc welding is disclosed. The gas comprises a mixture of helium, argon, 1.75% to 2.25% carbon dioxide and 0.25% to 1.0% oxygen (by volume). Use of the gas enables slag-free welds which accept readily paint applied by an electrostatic deposition process.
Claims16
A shielding gas mixture for welding, comprising by volume carbon dioxide within the range 1.75% to 2.25% together with oxygen within the range 0.25% to 1.0% with the remainder being helium and argon except for incidental impurities.
A gas mixture as claimed in any preceeding claim, containing by volume 1.9% carbon dioxide, 0.3% oxygen and 20% argon with the remainder being helium except for incidental impurities.
A cylinder or suitable container filled with a gas mixture comprising by volume carbon dioxide within the range 1.75% to 2.25% together with oxygen within the range 0.25% to 1.0% with the remainder being helium and argon except for incidental impurities.
A method of electric arc welding including the step of applying to the arc a shielding gas mixture comprising by volume carbon dioxide within the range 1.75% to 2.25% together with oxygen within the range 0.25% to 1.0% with the remainder being helium and argon except for incidental impurities.
Dependencies are inferred from the claim text.