![]() Thus, while a variety of specific welding techniques and filler metals may be used in the MIG process, the process is characterised by a shielding gas which is directed on to the arc to shroud the weld pool and which is effective to prevent the pool and the subsequent weld from being oxidised or corroded by air or other ambients. It is, however, not restricted to these metals or alloys. The MIG process conventionally is used with all of the major commercial metals including carbon, alloy and stainless steels, aluminium, nickel, copper, and alloys of these metals. In the MIG process an electric arc is struck and maintained between the workpiece to be welded and a consumable welding electrode which is continuously fed into the arc and which is of the required weld filler metal composition. The invention is particularly, though not exclusively, concerned with a shielding gas composition for use in an embodiment of the gas shielded arc welding process known as gas metal arc welding (MIG). This invention relates to gas shielded electric arc welding and is directed to the composition of the shielding gas used to surround the arc and to protect the arc weld pool. A method according to claim 11 further comprising the step of applying paint to a welded area by electrostatic deposition. A method according to claim 10 further comprising the step of applying paint to a welded area by electrostatic deposition.ġ6. A method according to claim 9 further comprising the step of applying paint to a welded area by electrostatic deposition.ġ5. A method according to claim 12 further comprising the step of applying paint to a welded area by electrostatic deposition.ġ4. A method of electric arc welding as claimed in claims 9 or 10 in which the gas mixture contains by volume 2.0% carbon dioxide, 0.5% oxygen, 17.5% argon and 80% helium with the remainder being incidental impurities.ġ3. A method of electric arc welding as claimed in claim 9 or 10 in which the gas mixture contains by volume 1.9% carbon dioxide, 0.3% oxygen and 20% argon with the remainder being helium except for incidental impurities.ġ2. A method of electric arc welding as claimed in claim 9 in which the concentration of helium lies within the range 65% to 95% by volume.ġ1. 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.ġ0. A cylinder or container as claimed in claim 5 or 6 containing by volume 2.0% carbon dioxide, 0.5% oxygen, 17.5% argon and 80% helium with the remainder being incidental impurities.ĩ. A gas mixture as claimed in claim 5 or 6 containing by volume 1.9% carbon dioxide, 0.3% oxygen and 20% argon with the remainder being helium except for incidental impurities.Ĩ. A cylinder or container as claimed in claim 5 in which the concentration of helium lies within the range 65% to 95% by volume.ħ. 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.Ħ. A gas mixture as claimed in claim 1 or 2 containing by volume 2.0% carbon dioxide, 0.5% oxygen, 17.5% argon and 80% helium with the remainder being incidental impurities.ĥ. 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.Ĥ. A gas mixture as claimed in claim 1, in which the concentration of helium lies within the range of 95% to 65% by volume.ģ. 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.Ģ. ![]()
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