| 摘要 |
A method of joining a first pipe (P1) of a plastic material to a second pipe (P2) of a material which does not bond well to the plastic material, utilizes an electrofusion sleeve (2) of a plastic material which bonds well to the plastic material of the first pipe and having a first coil (6) of electrical heater wire on the inner surface at one end of the sleeve to receive the first pipe (P1) and a second coil (7) of electrical heater wire on the inner surface at the opposite end of the sleeve to receive the second pipe (P2). The opposite end of the sleeve includes a bonding material capable of producing a good bond, when activated by heat, between the materials of the sleeve (2) and of the second pipe (P2). The two pipes are inserted into the two ends of the sleeve, and electrical current is applied to the two coils to cause the first end of the sleeve to bond by electrofusion to the first pipe (P1), and the second end of the sleeve to bond by electrofusion and by the bonding material to the second pipe (P2). |
