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The linked article Extra super duralumin and successive aluminium alloys for aircraft states that in 1935 the 7075 was developed. - 1935-Nen (Shōwa 10-nen) tōji sudeni chō jurarumiso (Super Duralumin) gōkin wa kaihatsu sa rete itaga Wildkatzen 09:22, 23 May 2019 (UTC)
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.
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.
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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]
Free broke up in 1971 due to tensions between members of the band. [1] In September, the group's first live album Free Live! was released, reaching number 4 on the UK Albums Chart and number 89 on the Billboard 200. [3] [6] The non-album single "My Brother Jake", released the same year, peaked at number 4 in the UK. [4]
Free is the second studio album by English rock band Free, recorded and released in 1969. It saw the burgeoning of the songwriting partnership between Paul Rodgers and 16-year-old bassist Andy Fraser; eight of the nine songs are credited to the two. The album performed poorly, failing to chart in the UK and in the US. [2]
Highway is the fourth studio album by the English rock band Free.It was recorded extremely quickly in September 1970 following the band's success at the Isle of Wight Festival but with an attitude of relaxation, [citation needed] the band having achieved worldwide success with their previous album Fire and Water (26 June 1970) and the single "All Right Now".