Precautions for welding high-power LED lamp beads for energy-saving floodlights
The high-power LED lamp bead welding process is to ensure that the energy-saving floodlight is the core of the high-quality factor of the entire product line. What kind of welding wire is used in the welding process is the core technology, and the welding wire used is the LED chip (also known as the chip) and the external pin. If there is a quality problem with the conductor between the electrical connections, the entire energy-saving floodlight will be scrapped. What should be paid attention to when welding high-power LED lamp beads?
This wire can be gold wire, silver wire, alloy wire or copper wire. Always use a stable gold thread. Why don't we use several other wires? Copper wires include single crystal copper wires and palladium-plated copper wires. The price of copper wires is relatively low, and the parameters such as stiffness, hardness, and yield strength are relatively high. However, the copper wires are easy to oxidize and the bonding process performance is unstable.
There are two main types of high-power LED soldering: manual soldering iron soldering and reflow soldering. Manual soldering is suitable for all types of LEDs, while reflow soldering is only suitable for LEDs in reverse-molded packages. Lens packaged LEDs cannot pass reflow soldering, because the transparent temperature limit of PC is only about 120°C.
The manual welding of energy-saving floodlight manufacturers is to weld the pins and aluminum substrates together by high-temperature melting tin, and at the same time coat the bottoms of the LED copper substrates and aluminum substrates with thermally conductive silicone grease.
Regardless of whether there is lead tin wire or lead-free tin wire for manual soldering, the soldering temperature should not exceed 320℃ and the soldering time should be controlled within 1-3S. Otherwise, the high temperature of the soldering iron will damage the PN junction of the chip.
The soldering iron soldering process must be operated in a standardized manner to prevent the soldering iron tip from burning the mold top colloid or the bracket, which will affect the normal use of the LED. To avoid charging the soldering LED, the soldering iron must be grounded.
