| 摘要 |
A planar induction member 8 having an aperture 10 formed therein, is configured to receive a current for inductively heating an object such as a pipe 4,6 for example, during and/or after welding of the object to a further object. The induction member 8 is configured to permit current flow around the aperture 10, a slot 15,17 acting as a current barrier. A further slot, diametrically to the slot 15.17, extending from the aperture towards the circumference of the induction member may be provided (fig 10). Insulation material may be inserted in the slots. An actuate or straight ferritic member 27,28 may be positioned on the induction member to guide the magnetic field. Coolant is circulated via passages 32,36. The induction heater 2 is configured to control heat supplied to the object. and a sensor such as a temperature sensor 50 is provided, the sensor having at least a partially unobstructed field of view of a heated portion of the object and/or having an at least partially unobstructed access to a heated portion of the object. Controlled relative movement between the work-piece and the heater may be provided. Conductors 25,26 may cross to avoid interference. |
