An induction heating device comprising at least one induction coil mounted to a support frame. The support frame is adapted to travel on a surface of an annular metal article to be heated and comprises a wheel set having one or more driven wheels. The support frame is adapted to travel on a side face of the annular metal article and is provided with first guide and second guide elements, which are respectively configured to engage with an outer circumferential surface and an inner circumferential surface of the annular metal article to ensure that the support frame travels on a circular path during use of the device.