One aspect is a method of coupling an insulator (112) to a surrounding ferrule (110) in an implantable medical device (100). An insulator (112) is provided having a plurality of conducting elements (114) extending therethrough. The insulator is placed with conducting elements within a ferrule having a frame-like shape surrounding the insulator along an interface. The insulator is heated with a first laser (140) until raising the temperature of insulator to a first temperature level. The ferrule is welded to the insulator along the interface with a second laser (150) once the insulator has reached the first temperature.
