| http://www.w3.org/ns/prov#value | - More specifically, when a material to be welded is a ferrous metal, the volume resistivity of this material is about 140 ????-cm at a temperature approximating the melting point, and this value is about 100 times as high as the volume resistivity of a coil material, for example, copper which has a volume resistivity of 1.7 ??5/8-cm.
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