| 摘要 |
<p>PURPOSE:To achieve connection having sufficient capacity by dispensing with the setting of a current supply time to a plastic pipe joint, by forming a blind hole for a thermocouple to the main body of a socket pipe joint in the vicinity of the connector pin thereof. CONSTITUTION:After a plastic pipe 2A is inserted in the piercing hole of a plastic socket pipe joint 1, welding plugs 3 are respectively engaged with the connector pins 13 at both ends of the pipe joint 1 to be mounted thereto. At this time, the connector 31 of each welding plug 3 is engaged with each of the connector pins 13 and the cylindrical projection 16 of the pipe joint 1 is engaged with the gap between the lower part of the connector 31 and a holder 33. Further, a thermocouple 231 is inserted in the blind hole 15 for the thermocouple. Next, a current is supplied to the electric heating wire 12 of the socket pipe joint 1 through the welding plug 3 to generate heat, and the inner peripheral surface part of the socket pipe joint 1 and the outer peripheral surface of the insert part of the plastic pipe 2A are melted. At this time, the temp. rise of the welding plug 3 due to the thermocouple 321 is measured and, when the temp. thereof reaches the preset max. temp., a current is stopped to connect the pipe joint under cooling.</p> |
