Aluminum cutting

Microscopic studies of blown or atomized aluminum reveal that no single aluminum product on the US. market is ideal. The author made studies of air separated aluminums and found the following factors to produce empirically better effects. Aluminum products were separated in a forty foot trough by air flow separation. Microscopic examination was used as a quality of separation control. Aluminums used for the study were Alcoa 101, 123 and Reynolds 120, all circa 1968. Ten pound batches of each were separated into six size ranges. Various formulas were made up with each cut, and known blends of aluminum cuts were similarly made into stars and fired as comets and in 3-inch shells. Samples of all star batches were burned statically. Microscopic examinations of residues of spritz debris collected on plastic film were used to evaluate combustion efficiency. 

Cobalt metal Nickel metal Tungsten carbide Borium carbide Titanium metal Tantal metal Niob metal Molybdenum Aluminum Cutting fluids Rubber materials Diamond... 

Uses Surfactant, film-former in metalworking applies., esp. for aluminum cutting and grinding and in fiber and plastic lubrication Features Reacts readily with alkalinity sources, making it easily incorporated into water-based fluids when exposed to temps, common in metal-forming operations, its film-forming props, reduce heat and improve tool life Properties SI. yel. cl. liq. sp.gr. 1.018 vise. 510 cp pH 2.4 (10%) 3.79% P UseLevei 1-15%... 

Infrared Blacks Aluminum can be anodized, but the result in the IR is not as black as the visible appearance suggests, and the reflectance at grazing angles is very high. One method of obtaining black anodized aluminum, for example, yields a specular reflectance of nearly 80% at 2 pm, while other treatments for aluminum cut this to 10%. Black chrome is described by Driver et al. (1977). 

Die cut metal lamiaates are also appHed to plastics for decorative effects, or for radio frequeacy iaterfereace shielding. These lamiaates are formed by vacuum depositioa, or by attachmeat of foil to a plastic layer for easier handling. Multiple layer composites of plastic and aluminum are used for specialized packagiag, especially for moisture or gas barriers. 

Ma.rine. In the presence of an electrolyte, eg, seawater, aluminum and steel form a galvanic cell and corrosion takes place at the interface. Because the aluminum superstmcture is bolted to the steel bulkhead in a lap joint, crevice corrosion is masked and may remain uimoticed until replacement is required. By using transition-joint strips cut from explosion-welded clads, the corrosion problem can be eliminated. Because the transition is metaHurgicaHy bonded, there is no crevice in which the electrolyte can act and galvanic action caimot take place. Steel corrosion is confined to external surfaces where it can be detected easily and corrected by simple wire bmshing and painting. 

The resistance to corrosion of some alloy sheet is improved by cladding the sheet with a thin layer of aluminum or aluminum alloy that is anodic to the base alloy. These anodic layers are typically 5—10% of the sheet thickness. Under corrosive conditions, the cladding provides electrochemical protection to the core at cut edges, abrasions, and fastener holes by corroding preferentially. Aircraft skin sheet is an example of such a clad product. 

Other Uses. Photochromic glass contains silver chloride (80) and silver molybdate [13765-74-7] (81) (see Chromogenic materials). An apparatus coated with silver nitrate has been described for the detection of rain or snow (82). Treatment with silver-thiosulfate complex has been reported as dramatically increasing the post-harvest life of cut carnations (83). Silver sulfate has been used in the electrolytic coloring of aluminum (84). Silver sulfate also imparts a yellowish red color to glass bulbs (85). 

Some cutting fluids, eg, oils, may present a fire ha2ard. Some work materials, eg, magnesium, aluminum, titanium (under certain conditions), and uranium, in finely divided form, also present fire ha2ards. Very small metal chips or dust may ignite. 

Embedded. Rectangular-cross-section aluminum fin which is wrapped under tension and mechanically embedded in a groove 0.25 0.05 mm (0.010 0.002 in) deep, spirally cut into the outside surface of a tube. 

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