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Perhaps there should be some information on this. --petebachant 19:31, 17 July 2013 (UTC) []It basically isn't weldable, though a bit of work with friction-stir welding of 7075-0 is showing that there may be some promise along those lines.
The first 7075 was developed in secret by a Japanese company, Sumitomo Metal, in 1935, [3] but reverse engineered by Alcoa in 1943, after examining a captured Japanese aircraft. [4] 7075 was standardized for aerospace use in 1945. [5] 7075 was eventually used for airframe production in the Imperial Japanese Navy.
The UNS number is K92580. The alloy has a modulus of elasticity of 28,200 ksi and a density of 0.285 lb/in 3 (7.89 g/cm 3).AerMet 100 alloy is somewhat more difficult to machine than 4340 at HRC 38.
Many metals and thermoplastics can be welded, but some are easier to weld than others (see Rheological weldability). A material's weldability is used to determine the welding process and to compare the final weld quality to other materials. Weldability is often hard to define quantitatively, so most standards define it qualitatively.
Lead works in a similar way to sulfur. Bismuth achieves a free machining steel by melting into a thin film of liquid for a fraction of a microsecond to lubricate the cut. Other advantages to bismuth include: more uniformly distributed because of its similar density to iron; more environmentally friendly, as compared to lead; still weldable. [1]
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