Apparatus and method for forming a body

摘要

An apparatus for forming a component, for example for an aerospace engine, includes a welding head 12 which supplies a weld material 24 to be deposited on a substrate 56 in order to build up the component. A flow of current is provided between the welding head 12 and the substrate 56 thereby melting the weld material and forming a molten weld pool in the substrate. A coil 50 is located above the weld pool and is provided with an alternating current thereby inducing an alternating magnetic field in the region of the weld pool to exert a force upon the molten substrate of the weld pool. This improves the crystal structure and therefore the properties of the resulting component.