Induction welding device and method for sectional materials

Provided are an induction welding device and method for sectional materials. The device comprises an induction welding device body, a PLC control system, a hydraulic system, a cooling system and an induction heating power supply, and further comprises a left mounting plate, a right mounting plate and two sub-coils. The method includes the following steps that two pieces of sectional materials to be welded are located through locating pieces installed on the lower portion of a center shaft of the induction welding device body in a connected mode; a clamping oil cylinder drives two sets of clamp bodies to rotate around the center shaft respectively to clamp and center the sectional materials to be welded; an opening-closing induction heating coil moves the butt joint of the sectional materials with the help of an auxiliary oil cylinder, a locating oil cylinder pushes and wraps the two sub-coils and makes contact with an electrode structure; the PLC control system starts the induction heating coil to heat; when