Abstract: A process for improving the properties of an aluminum-lithium product formed from a slab, such as an ingot or billet, of an aluminum-lithium alloy. Improved properties include superplastic response, reduced edge cracking during rolling, and reduced formation of stains during annealing. The process includes heating the slab to an elevated temperature to solutionize its soluble constituents, holding the slab at the elevated temperature to allow its soluble constituents to go into solution, cooling the slab to a rolling initiation temperature above about 650.degree. F. (343.degree. C.), and hot/warm rolling the slab to a desired gauge.

Abstract: A method for producing superplastic aluminum alloys, including a hot/warm rolling operation is disclosed. Use of this method eliminates the need for overaging the material prior to rolling.

Abstract: A method of forming superplastic aluminum is disclosed. The prior need for overaging prior to rolling is eliminated by rolling the aluminum beginning at a hot rolling temperature and ending at a warm rolling temperature.

Abstract: The use of a sequentially applied warm working/cold working procedure in the conventional steps of preparing heat treatable superplastic alloys yields material which demonstrates substantially equiaxed fine grain structure and improved superplastic forming characteristics.

Abstract: Aluminum-magnesium-manganese alloy cold rolled to produce armor plate with improved ballistic properties.

Abstract: An apparatus for and method of welding aluminum members substantially vertically is provided wherein a groove-defining surface is formed on each of the members and such members are positioned adjacent each other with the groove-defining surfaces cooperating to define a substantially vertically extending groove. A gas-metal arc torch having a consumable electrode and means for supplying a shielding gas therearound is placed with the electrode in the groove, whereupon a welding arc is generated and the torch is moved substantially vertically along the groove while holding the torch at a backhand torch angle. The consumable electrode and shielding gas are fed at predetermined rates therefor while moving the torch and welding arc substantially vertically along the groove to produce weld metal in the groove having an outside oxide support skin and the oxide support skin is the only support required for the weld metal during its solidification.

Abstract: In combination with conventional apparatus for joining members of aluminum or other electrically conducting material by resistance welding, adjustable supports for arranging the work-contacting electrodes in spaced proximity to the work, and circuitry for inducing an inert gas shielded arc of alternating current across each electrode and the work, the apparatus being operable to effect self-cleaning of the electrodes as well as the work between successive welding operations.