(1) Hot-press welding
Use heating and pressure to press the metal wire and the welding area together. The principle is to heat and pressurize the welding area (such as AI) to cause plastic deformation and destroy the oxide layer on the pressure welding interface, so that the atoms are attracted to each other to achieve the purpose of "bonding". In addition, when the two metal interfaces are uneven, the upper and lower metals can be embedded in each other when heated and pressurized. This technology is generally used for COG chips on glass plates.
(2) Ultrasonic welding
Ultrasonic welding uses the energy generated by an ultrasonic generator. Under the induction of an ultra-high frequency magnetic field, the transducer quickly expands and contracts to produce elastic vibrations, causing the splitter to vibrate accordingly. At the same time, a certain amount of pressure is applied to the splitter. Therefore, under the combined action of these two forces, the splitter drives the AI wire to quickly rub against the metallization layer of the welded area, such as (AI film), causing plastic deformation of the AI wire and the AI film surface. This deformation also destroys the oxide layer on the interface of the AI layer, so that the two pure metal surfaces are in close contact to achieve atomic bonding, thereby forming a weld. The main welding material is an aluminum wire welding head, which is generally wedge-shaped.
(3) Gold wire welding
Ball welding is the most representative welding technology in wire bonding, because semiconductor packaging diodes and transistor packaging all use AU wire ball welding. It is also easy to operate, flexible, and has a firm solder joint (the soldering strength of AU wire with a diameter of 25UM is generally 0.07~0.09N/point). It is also non-directional, and the welding speed can be as high as 15 points/second or more. Gold wire welding is also called hot (pressure) (ultrasonic) welding. The main bonding material is gold (AU) wire welding head is spherical, so it is called ball welding.
COB LED Welding Method
Sep 02, 2024
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