| 摘要 |
PURPOSE:To improve the adhesion joining to a cladding material of an inserting tube by inserting and expanding the tube after piercing the tube aperture of the cladding material smaller than the tube aperture diameter of the base metal on the cladded steel tube plate which arranges a low bearing force cladding material to the base metal of carbon steel and expanding with compression the same as the aperture caliber of the base metal. CONSTITUTION:A copper tube inserting hole is pierced at the prescribed position of the cladded steel tube plate which arranges the cladding material 20 of low bearing force like a copper alloy, etc. on a carbon steel base metal 19 and in this case the caliber of the pierced hole of the cladding material 20 is made smaller than the pierced hole caliber of the material 20. The hole caliber of the cladding material 20 is made the same as the hole caliber of the base metal 19 by a caliber expanding means and the bearing force is strengthened by the work hardening. A copper tube 16 is inserted and the caliber is expanded by a tube expanding means and joined tightly with the cladded steel tube plate. The cladding material 20 part is joined tightly with the inserting tube without escaping at the tight joining time by the work hardening and the corrosion of the base metal 19 is prevented and the stress corrosion cracks are eliminated. |
