| 摘要 |
<p>In a method of arc welding under water or at superatmospheric pressure (or both) the weld is made in a chamber containing a gaseous atmosphere. The weld metal is deposited from flux-cored welding wire whose core contains strong deoxidant(s) such as aluminium, magnesium, titanium, zirconium, lithium, and calcium. A shielding gas containing a selected proportion of oxygen or oxygencontaining gas but consisting mainly of an inert gas such as argon or helium is employed to surround the arc. The shielding gas may be constituted by the atmosphere in the chamber or alternatively it may be fed to the welding torch with the welding wire and issue from the torch in the form of an annular stream surrounding the wire as the wire emerges from the torch. The invention makes possible the achievement of sound welds having achievable mechanical and metallurgical properties at depths of water down to 450 feet or below.</p> |
