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  2. Spark testing - Wikipedia

    en.wikipedia.org/wiki/Spark_testing

    [2] 400-series stainless steel 400-series sparks are similar to 300-series sparks, but are slightly longer and have forks at the ends of the sparks. [2] Cast iron Cast iron has very short sparks that begin at the grinding wheel. [1] Nickel and cobalt high-temperature alloys These sparks are thin and very short, they are dark-red in color, and ...

  3. Metal stitching - Wikipedia

    en.wikipedia.org/wiki/Metal_stitching

    Metal stitching is an industrial technique for repairing cracked and broken cast iron, steel, bronze or aluminium structures and their components. The process is carried out cold, without welding . It allows the repair of cast iron and cast steel , often in-situ, without the distortion from welding , and can be used in other situations where ...

  4. Dunkerley's method - Wikipedia

    en.wikipedia.org/wiki/Dunkerley's_Method

    When an element of mass is offset from the axis of rotation, centrifugal force will tend to pull the mass outward. The elastic properties of the shaft will act to restore the “straightness”. If the frequency of rotation is equal to one of the resonant frequencies of the shaft, whirling will occur. In order to save the machine from failure ...

  5. Spin crossover - Wikipedia

    en.wikipedia.org/wiki/Spin_crossover

    The HS Fe II remains under 20% i the range of 4.2 K to 50 K, but at room temperature about two-thirds of the Fe II ions in the sample are HS, as shown by the absorption band at 2.1 mm/s, while the other third of the ions remain in the LS state. The thermally induced spin transition is an entropy driven process.

  6. High-speed steel - Wikipedia

    en.wikipedia.org/wiki/High-speed_steel

    It consisted of 2% carbon, 2.5% manganese, and 7% tungsten. The major advantage of this steel was that it hardened when air cooled from a temperature at which most steels had to be quenched for hardening. Over the next 30 years, the most significant change was the replacement of manganese with chromium. [2]

  7. Unified numbering system - Wikipedia

    en.wikipedia.org/wiki/Unified_numbering_system

    A UNS number only defines a specific chemical composition, it does not provided full material specification. Requirements such as material properties (yield strength, ultimate strength, hardness, etc.), heat treatment, form (rolled, cast, forged, flanges, tubes, bars, etc.), purpose (high temperature, boilers and pressure vessels, etc.) and testing methods are all specified in the material or ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Centerlock wheel - Wikipedia

    en.wikipedia.org/wiki/Centerlock_wheel

    A centerlock wheel is a type of automobile wheel in which the wheel is fastened to the axle using a single, central nut, instead of the more common ring of 4 or 5 lug nuts or bolts. It is mostly used in racing and high end sports cars.