Thermocompression bonding

The thermo-compression welding is a fusion welding process and is similar to the arc stud welding. The previously molten bonding partners are then pressed together.

The method is not only used for butt welding of small components (see stud welding, stud bolts on solid bodies or sheets ), but under the name of thermo-compression method also in electronics for contacting the chip with the housing ( wire bonding ).

The thermo-compression process in the electronic component manufacturing ( wire bonding ) of the wire is melted by a flame or electric discharge. This creates a liquid sphere (german ball ), then the pressure at the contact point ( Bond Island, Engl. Pad) is pressed. The resulting contact is nailhead ( German: needle head ) because of their shape called. For connection to the second contact point of the wire in an arc (English loop) is performed, pressed and cut, the so-called stitch. This is done at temperatures of about 350 to 500 ° C.

In wire bonding, gold wire only may be processed with stud welding can, for example, steel, brass and copper and are welded to each other. The joint effect is based on interlocking zones ( " push button " effect), so that can not otherwise be connected weldable partner.

• Connection Technology ( Electrical Engineering)