Introduction to reflow oven
Reflow oven uses flux coating, then preheating circuit board/activated flux, and then using welding nozzle for welding mode. The traditional artificial soldering iron welding needs to use point-to-point welding for each point of the circuit board, so there are more welding operators. Selective wave soldering machine is the industrial batch production mode of assembly line, different sizes of welding nozzle can be batch welding, usually welding efficiency can be improved dozens of times more than manual welding (depending on the design of the specific circuit board). Due to the use of programmable mobile small tin cylinder and a variety of flexible welding nozzle, (tin cylinder capacity of about 11 kg), so in welding can be set through the program to avoid the circuit board under some fixed screws and reinforcement and other parts, so as not to contact high temperature solder and cause damage. This welding mode, without the use of custom welding tray and other ways, is very suitable for many varieties, small batch production mode.
Reflow welding has the following advantages:
High production efficiency in welding, can realize a higher degree of automatic welding.
Precise control of flux injection position and injection quantity, microwave peak height and welding position.
Nitrogen protection on the surface of microwave peak; Optimization of process parameters for each solder joint.
Quick replacement of nozzles of different sizes.
Single spot welding and through hole connector pin sequence welding technology combined.
According to the requirements can be set solder joint shape “fat” “thin” degree.
You can choose a variety of preheating modules (infrared, hot air) and the added preheating module above the board.
Electromagnetic pump maintenance free.
The selection of structural materials is completely suitable for the application of lead-free solder.
Modular design reduces maintenance time.
Introduction to laser welding
The light source for green laser welding is a laser light-emitting diode (LLED), which can be precisely focused on the solder joint through an optical system. The advantage of laser welding is that it can precisely control and optimize the energy required for welding. It is suitable for selective reflow welding process or using tin wire connector. For SMD components, the solder paste should be applied first and then welded. The welding process is divided into two steps: first the solder paste is heated, and the solder joint is preheated. After that, the solder paste used for welding is completely melted, and the solder is completely wetted on the pad to form the weld.Use laser generator and optical focusing component welding, energy density, high heat transfer efficiency, non-contact welding, solder can be solder paste or tin wire, especially suitable for welding small space solder spot or small solder spot power is small, save energy.
Laser welding features
Multi-axis servo motor board card control, high positioning accuracy.
Small laser spot, in the small size of pads, spacing devices have obvious welding advantages.
Non-contact welding, no mechanical stress, static risk.
Wuxi slag, reduce flux waste, low production cost.
Weldable products are rich in type.
Choice of solder.
Advantages of laser welding
For ultra-fine electronic substrate, multi-layer electronic components, “traditional technology” has been unable to apply, which prompted the rapid progress of technology. The processing of ultra-small parts that are not suitable for the traditional soldering iron method is finally completed by laser welding. Non – contact welding is the biggest advantage of laser welding. There is no need to touch the substrate and electronic components at all, and providing solder only by laser irradiation does not pose a physical burden. Effective heating with a blue laser beam is also an advantage, which can be used to illuminate narrow areas where the soldering head cannot enter and at different angles when there is no distance between adjacent components in a dense assembly. The soldering iron head needs to be replaced regularly, while the spare parts for laser welding need to be replaced are very few and the maintenance cost is low.
Post time: Nov-23-2021