Thermocompression welding

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The thermo-compression welding (nail head welding) is a fusion welding process and is similar to the arc stud welding . The previously melted joining partners are then pressed together.

The process is not only used for butt welding small components (see stud welding , welding of studs onto solid bodies or sheet metal), but also in electronics under the name thermocompression process for contacting the chips with the housing ( wire bonding ).

In the thermocompression process in electronic component production (wire bonding), the wire is first melted by a flame or an electrical discharge. In this case, a liquid is formed ball (engl. Ball ) which then under pressure to the pad (bonding pad, engl. Pad is pressed). The resulting contact is because of their shape nailhead (German: Nail head) called. To connect to the second contact point, the wire is looped , pressed and cut, the so-called stitch . This happens at temperatures of approx. 350 to 500 ° C.

With wire bonding only gold wire can be processed, with stud welding, for example, steel, brass and copper can also be welded with and to one another. The joining effect is also based on interlocking zones (“push-button effect”), so that otherwise non-weldable partners can be connected.

Individual evidence

1. ↑ Jürgen Ruge: Manual of welding technology: Volume II: Process and production. Springer-Verlag, 2013, p. 144.