| http://www.w3.org/ns/prov#value | - Moreover, although the utilization of the soldering method is also considered as a method of electrically and mechanically fixing the metal plate to the electrode other than the welding, the natural oxide film (alumina) as described above is generated on the surface of the electrode made of the aluminum base alloy, and therefore presents obstacles to the wettability and attachment of the solder, a
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