![]() More news from electronics manufacturing industry » SEHO Systems GmbH stands for 45 years of soldering innovation SEHO MWS 2300 Provides Automatic Nozzle Height Adjustment SEHO to Demo the Modular SelectLine-C at productronica China Shanghai Yiling Precision Electronics Co., LTD and SEHO Systems China at the CEIA Forumįree Online Seminar from SEHO and STANNOLto Discuss Water-Based Fluxes Many New Features and High-Mix-High-Volume Production in Focus SEHO Awarded for New SmartSplit for Selective Soldering during productronica SEHO to Show Award-Winning Soldering Solutions at APEX 2022 SmartSplit: Cycle time halved for selective soldering in mixed production New Functions Increase Cost-Efficiency and Energy-Efficiency in Wave Soldering Processes The soldering process then can be performed at customer site on their own soldering machine, with the standard fluxer being deactivated.” “This allows us to apply a flux coating at our Technology Center in Germany and return the boards to customers. “The outstanding long-term stability of the flux that has been applied in a plasma process is remarkable,” explains Dr. As a result, the initial costs for the plasma fluxing system can be made up within a short time.Ī particular benefit of the plasma fluxing method is its ability to “revive” overaged PCBs that show perfect wetting results. The precise, selective flux application method leads to a reduction of the flux amount needed, and with the additional elimination of liquid, remarkable savings are achieved in the total flux material costs. In comparison, the handling and storage of powder is much easier, resulting in an overall reduction in manufacturing costs, and additional benefits emerge from the environment friendly concept of the plasma fluxing process. Solvent-based fluxes are declared as hazardous material (class 3) and special measures are necessary in terms of storage, handling and waste management. Consequently, maintenance requirements are remarkably reduced while availability of the process equipment is increased. Additionally, the degree of contamination of the fluxer work area and the soldering system is smaller, as there is no evaporation of solvents from the flux. Therefore, an additional cleaning process can be avoided. Soldering results that are achieved with this process are extremely good and they are directly comparable to standard liquid fluxes, even with complicated structures.Īn additional advantage is the cleanliness of the PCB surface after the soldering process. The plasma process substitutes the conventional wet-chemical flux activation with a dry process. Once the aerosols touch the surface, the particles solidify and form a long-term stable coating. When processing assemblies, an aerosol formed out of melt-able flux particles and Nitrogen is led into the plasma flame and directed to the PCB surface. A liquid carrier material is not needed, and the gas that is used to create the plasma flame is Nitrogen, which is widely spread in wave soldering technology. ![]() The PlasmaFluxer from SEHO uses cold-active plasma to melt micrometer sized powder of pure adipic acid and deposit it on the PCB surface. Non-activated flux residues that remain on the assembly may cause severe quality issues or even the complete breakdown of the assembly. Flux residues are still an issue, particularly due to the increasingly extreme operating conditions electronic assemblies are exposed to. Alcohol is only needed for application of the flux and needs to be dried off before entering the solder wave. This task is taken over by the flux, which in wave soldering processes is often alcohol-based and containing only a small amount around three percent of active components, that indeed are necessary for the process. ![]() The activation of components and the PCB surface is the key factor to obtain a connection between the solder and the terminations. Simultaneously, product quality can be improved remarkably. In a plasma process, flux powder is deposited at the solder joints with an outstanding adherence and long-term stability. SEHO offers a solvent-free alternative – the SEHO PlasmaFluxer. ![]() ![]() Interrupted supply chains and an increasing demand for alcohol as a basis for disinfectants has resulted in massive price increases. Flux manufacturers have already reported a remarkable shortage of stocks for alcohol-based fluxes used in electronics manufacturing. ![]()
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