| 摘要 |
PURPOSE:To improve the strength and the reliability of airtightness of a pipe joint which makes a welding connection by inserting a copper pipe into an iron- made pipe, by forming a spraying film of copper or a copper alloy material on the internal wall of the joint part by linear detonation flame spraying. CONSTITUTION:The pipe joint makes a welding connection by inserting the suction copper pipe 7 into the suction pedestal 5 of the pipe joint and the spraying film 14 of copper having 10-20mum thickness is formed on the internal wall of the cylindrical connection part 10 of the suction pedestal 5 by linear detonation flame spraying by using copper or a copper alloy material, specially phosphor copper brazing filler metal. The necessary time for single flame spraying is <=1/10,000 seconds and total time including the charging time of a power source is <= several seconds. Then, the suction copper pipe 7 is inserted into the cylindrical connection part 10 of the suction pedestal 5 and the welding connection is made. |
