Patent ID: 6166359
Filing Date: 2000-12-26
Classification: B23K

Abstract:
Induction heating apparatus for use in welding an end of a first length of pipe to the exterior surface of a second length of pipe, consisting of at least one heating assembly comprising at least one electrical induction coil wound on an annular, laminated, magnetic core assembly, the lowermost surfaces of said core assembly defining a saddle shape so as to be capable of being seated on the exterior surface of said second length of pipe, the arrangement of the at least one coil and the core assembly being such that substantially all of the magnetic flux generated when the apparatus is seated on said second length of pipe and the coil is energised is contained within the core assembly and within the wall of said second length of pipe and wherein said core assembly has an E-section profile, the ends of the limbs of the E-section comprising the lowermost surfaces of the core assembly and said at least one coil being wound about the central limb of the E-section.