Since its market launch almost 40 years ago, Ersa reflow soldering systems have defined the industry standard for economical, energy-efficient reflow soldering. Ersa HOTFLOW soldering machines offer performance tailored to customer requirements - the HOTFLOW ONE as an entry-level model with a strong price-performance ratio and high efficiency, the HOTFLOW THREE as a benchmark for high-volume reflow soldering with even more quality, efficiency and sustainability. With 11 heating zones, a vacuum chamber with integrated heating and 4 cooling zones, the EXOS 10/26 ensures low-void connections in electronics production.
Performance reflow soldering systems with the best energy balance Ersa Technology
The reflow soldering systems in the HOTFLOW series are based on proven convection heating technology. It guarantees gentle and evenly homogeneous heating of the electronic assemblies, largely independent of the range of SMT components they are fitted with. The EXOS 10/26 extends the range of systems to include reflow soldering under vacuum and guarantees the lowest void rates in the solder joints.
Process steps Ersa Reflow Soldering
Preheating
Preheating
The preheating zone is used for thermal conditioning of the assembly to be soldered for the actual soldering process. In other words, the aim is to bring components of different sizes to a common temperature and to activate the flux in the solder paste. The preheating zone creates optimal conditions for the immediately following soldering process.
Process gas cleaning: The purity of the process zone is the primary objective in the reflow process, as it is a decisive factor in determining machine availability as well as the stability and reproducibility of the soldering processes. Impurities in the process gas atmosphere have various origins. The two most important sources are the solder pastes and the base materials of the printed circuit boards. The elementary task of the no-clean management system is to remove these residues from the process gas atmosphere so that neither assemblies nor the process chamber are contaminated by deposits.
Peak Zone
Peak Zone
In the peak zone, the temperature exceeds the melting point of the solder paste. The solder paste deposits printed on the PCB remelt and wet the pads of the PCB and the component metallizations. The stability and reproducibility of the process temperatures ensures high reliability of the formed solder joints.
Heat transfer: In modern reflow systems, heat transfer efficiency has a decisive influence on all quality, productivity and operating cost aspects that directly affect profitability. Therefore, in HOTFLOW reflow soldering systems, special attention has been paid to further optimized energy transfer in order to achieve a minimum ΔT with the lowest possible energy consumption.
Vacuum
Vacuum
If the components are exposed to a vacuum in the peak area, i.e. in the molten solder state, voids in the solder are removed from the solder joints by negative pressure. For certain SMT components such as power semiconductors or high-power LEDs, this improves thermal dissipation during operation.
Cooling
Cooling
The cooling of the assemblies after the soldering process is carried out under controlled conditions, in particular the cooling speed. This depends on the assembly design and can be individually adapted. Subsequent process steps such as AOI, manual inspection or BG handling are thus possible under optimum thermal boundary conditions.
Transport
Transport
The assemblies are transported through the process zone of the reflow soldering system by means of pin chains that are guided in profiles. A second transport track is optionally available, both to increase throughput and to use a different transport speed for a different solder alloy, for example.
