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Gauges- A manufacturers standard numbering system denoting decimal sheet or wall thickness.

Galvanic Corrosion- A situation whereby one metal will be corroded preferentially in relation to another metal with which it is physically connected.

Galvanizing- The process of coating irons or steels with zinc (occasionally tin) for the purpose of corrosion protection.

Gas Welding- welding using a gas flame

Grain Structure- The relationship between the small individual crystals (the grain) in a metal or alloy.

Grain Size- Denotes the average diameter of the grain in a metal, sometimes measured also as number of grains per given square area. 

Grinding- Use of a grinding wheel or abrasive belt to remove material from a subject metal.

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