hardness. n. 1. the quality or condition of being hard. 2. (Minerals) one of several measures of resistance to indentation, deformation, or abrasion. See Mohs scale, Brinell hardness number.3. (Chemistry) the quality of water that causes it to impair the lathering of soap: caused by the presence of certain calcium salts.ardness. n. 1. the quality or condition of being hard. 2. (Minerals) one of several measures of resistance to indentation, deformation, or abrasion. See Mohs scale, Brinell hardness number.
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Brazing is a metal-joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, the filler metal having a lower melting point than the adjoining metal.anual torch brazing is a procedure where the heat is applied using a gas flame placed on or near the joint being brazed. The torch can either be hand held or held in a fixed position depending on whether the operation is completely manual or has some level of automation.