Principle of laser tin wire welding

       Laser tin wire welding is a technique that uses a laser as a heat source for welding. The basic principle is to generate a highly concentrated beam of light through a laser, converting light energy into heat energy, thereby melting the solder and achieving welding. The specific process is as follows:

Automatic wire feeding guide + laser solder head

  1. Preheating: In the preheating stage, the laser light is emitted, and the laser beam is focused on the metal welding pad to be welded, and the welding spot is heated by laser radiation to the welding pad position.

  2. Tin wire feeding: While the pad is preheating, the tin wire feeding equipment will be sent to the pad position.

  3. Melting solder: When the temperature of the pad is high enough, the laser continues to irradiate, so that the tin wire is rapidly melted, and flows into the tiny gap between the pad and the welded part.

  4. Forming solder joints: the tin wire is withdrawn from the solder joints, the laser gradually weakens to stop, and the solder joints are formed and cooled.

     Rectangular pad laser wire feeding welding GIF

     The precise implementation of the three steps of material preheating, wire feeding melting and wire drawing away is the key point to determine whether the laser wire feeding welding is perfect.

      For example, when preheating PCB pads, the temperature must be strictly controlled, the high temperature will cause damage to the PCB pads and existing electronic components, and the low temperature can not play a preheating effect. The wire feed and wire release speed should be fast, the wire feed speed is slow, which will cause the phenomenon of laser burning PCB, and the wire release speed is slow, which will cause excess welding wire blocking the wire feed nozzle.

     Song sheng photoelectric laser wire feeding solder is composed of real-time temperature feedback system, CCD coaxial positioning system and semiconductor laser. Equipped with self-developed intelligent brazing software, support to import a variety of formats. The original PID online temperature adjustment feedback system can effectively control the constant temperature solder, ensure the solder yield and precision, wide application range, can be used in online production, can also be independent processing. Have the following advantages:

                      Tabletop laser wire feed thermostatic soldering system illustration

   1. Non-contact solder, no mechanical stress damage, less thermal effect.

   2. Multi-axis intelligent working platform (optional), can cope with a variety of complex precision soldering process.

  3. Coaxial CCD camera positioning and processing monitoring system, can clearly present solder joints and timely correct alignment, to ensure processing accuracy and automatic         production.

  4. The original temperature feedback system can directly control the temperature of the solder joint, and can realize the presentation of solder temperature curve to ensure the yield of solder.

  5. Laser, CCD, temperature measurement, indicating light four-point coaxial, perfect solution to the industry's multi-path coincidence problem and avoid complex debugging.

 6. Under the condition of 99% excellent rate, the solder joint diameter of the solder joint is at least 0.2mm, and the soldering time of a single solder joint is shorter.

 7.X axis, Y axis, Z axis to adapt to more devices of solder, more widely used.

 8. Desktop operation, easy to move.

     Laser wire feeding welding has the characteristics of compact structure and one-time operation. Full solder joint, good wettability with pad, especially suitable for PCB circuit board, optical components, acoustic components, semiconductor refrigeration components and other integrated circuit board and single electronic components solder.