Method of manufacturing double metal pipe
专利汇可以提供Method of manufacturing double metal pipe专利检索，专利查询，专利分析的服务。并且PURPOSE: To surely conjoin an inner and an outer pipes to each other along their total length even if they have a plate thickness error within the tolerance, by utilizing the contraction of the outer pipe and the expansion of the inner pipe to conjoin them to each other.
CONSTITUTION: An inner pipe 2 is loosely fitted in an outer pipe 1. A high frequency coil 3 is provided around the outer pipe 1 and connected in series with a high-frequency power source 8 through wires 7. When a high-frequency current is caused to flow through the series-connected circuit, a current concentrates on the surface of the outer pipe 1 due to the skin effect so that the outer pipe is heated and expanded. Both the ends of the inner pipe 2 are closed with plugs 5. Water is injected into the interior 4 of the inner pipe 2 to pressurize the interior by the water to expand the pipe. The outer pipe 1 is spontaneously cooled so that it contracts and its diameter decreases. Since the inner pipe 2 is expanded and the outer pipe 1 contracts, the inner pipe 2 is tightly fitted on the inside of the outer pipe 1. Both the pipes 1, 2 are thus surely conjoined to each other along their total length.
COPYRIGHT: (C)1982,JPO&Japio，下面是Method of manufacturing double metal pipe专利的具体信息内容。
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