Microwelding - equipment designed to create an integral connection by establishing intermolecular and interatomic bonds between particularly thin (less than 500 microns) parts of the product. This technology is used in the production of precision instruments and in industrial radio electronics. It can be used for printed wiring and sealing of bellows, membrane boxes and housings in the production of microcircuits, as well as in the jewelry industry.
A kind of microwelding
Design and technological features
Basically, microwelding uses low-melting materials with good electric current permeability, such as aluminum and gold. There are two main types of welding joints: a wedge and a ball (in some cases, their combination). Thermal compression welding provides the supply of thermal energy to the contact zone by heating both the working tool and the board itself. Such a technological process, as a rule, is used in automatic installations, as it takes place in more extreme modes, due to which manual control of pressure, temperature and welding time is practically eliminated. The most common type of welding is ultrasonic micro-welding with gentle operation, which can be used with heat-sensitive parts. During the welding process, energy is directed to the contact zone in the form of ultrasonic vibrations, while the pressing force is low. When exposed to ultrasound, microparticles vibrate, causing intense heating in the contact zone, accompanied by the destruction of oxide films. Due to the chemical and physical activity of exposed surfaces, a rapid connection occurs at the atomic level. During wedge welding, the wire is fed at the tip of the wedge through a microscopic channel, then, thanks to a special groove at the tip of the wedge, a stable connection is made. With ball micro welding, a ball is formed at the end of the wire, which is connected to the platform, allowing the formation of long loops of an arbitrary profile.
