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  2. Gold-filled jewelry - Wikipedia

    en.wikipedia.org/wiki/Gold-filled_jewelry

    In the United States, the quality of gold-filled composite is defined by the Federal Trade Commission (FTC). If the gold layer is 10kt fineness, the minimum weight of the plated layer on an item stamped gold-filled marks according to the Federal Trade Commission (FTC) must equal at least 1 ⁄ 20th of the total weight of the item.

  3. Gold plating - Wikipedia

    en.wikipedia.org/wiki/Gold_plating

    Gold plated - gold layer thickness greater than or equal to 0.5 micron; Heavy gold plated / Vermeil - gold layer thickness greater than or equal to 2.5 micron; Gold plated silver jewellery can still tarnish as the silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface ...

  4. Galling - Wikipedia

    en.wikipedia.org/wiki/Galling

    Aluminium is a ductile metal, which means it possesses the ability for plastic flow with relative ease, presupposing a relatively consistent and significant plastic zone. High ductility and flowing material can be considered a general prerequisite for excessive material transfer and galling because frictional heating is closely linked to the ...

  5. Ingot - Wikipedia

    en.wikipedia.org/wiki/Ingot

    Aluminium ingot after ejection from mold Pouring molten gold into a mold at the La Luz Gold Mine in Siuna, Nicaragua, about 1959. An ingot is a piece of relatively pure material, usually metal, that is cast into a shape suitable for further processing. [1] In steelmaking, it is the first step among semi-finished casting products. Ingots usually ...

  6. Forming (metalworking) - Wikipedia

    en.wikipedia.org/wiki/Forming_(metalworking)

    Forming processes tend to be categorised by differences in effective stresses. These categories and descriptions are highly simplified, since the stresses operating at a local level in any given process are very complex and may involve many varieties of stresses operating simultaneously, or it may involve stresses which change over the course of the operation.

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    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!

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