SEHO SelectLine provides many new and innovative features.

With the SelectLine platform, SEHO developed a selective soldering system that convinces with the highest precision and solder joint quality, and features maximum flexibility even for unusual assembly dimensions.
The SelectLine machine concept is consistently modular thus ensuring clear cost benefits. Several modules with different dimensions can individually be configurated with fluxer, preheatings, soldering units, cooling modules, selective brush unit and AOI system. Thus, the SelectLine adapts to virtually any manufacturing requirement and if the production conditions should change it may be expanded, the configuration can be modified, or SelectLine modules can be shifted to different manufacturing lines at any time. Up to 6 soldering units and more than 15 parallel workstations can be integrated in one system.

„It is our aim to continuously create added value for our customers by constantly improving our machines and existing processes, optimizing them for future applications and implementing innovative ideas”, says Alexander Blum, Product Manager Selective Soldering Equipment at SEHO. Many of these innovative ideas are integrated in the SelectLine and have made the selective soldering machine one of the most successful within the SEHO portfolio.

Electro-magnetic soldering units with innovative nozzles for mini-wave and multi-wave soldering processes are part of the standard machine equipment. Maximum throughput requirements are met with the Synchro concept, patented by SEHO. This intelligent software feature coordinates the soldering process with several soldering units for one assembly type in such a way that the cycle time is nearly halved without the need for significant investment. If different products are manufactured in mixed operation, the SmartSplit function ensures automatic split of the available soldering units, thus providing maximum throughput rates.
Automatic ultrasonic cleaning of solder nozzles is another highlight in the soldering area. What previously had to be done manually and with aggressive chemicals, is automatically and environmentally friendly performed through the machine. The solder nozzle is gently cleaned and completely re-wetted.
The SelectLine is ideally suited for using the new LongLife mini-wave solder nozzle. This new nozzle features a lifetime that is at least three times longer than that of conventional nozzles. Therefore, the annual savings potential is remarkable. Maintenance requirements for the new nozzle are significantly reduced. The LongLife solder nozzle does not need to be cleaned or re-activated throughout a complete production shift. In addition, there is no activation needed prior to production start.
Moreover, the SelectLine is perfectly prepared for the constantly growing requirements in the manufacturing of next-generation products, such as 5G antennas or LED technology. By means of an automatic software switch the system is able to process virtually endlessly long PCBs. The software automatically coordinates and optimizes the assembly transport and the positioning of the process stations. As the individual processing stations thereby do not have to match the actual length of the assemblies, the SelectLine stands out for its very compact design. This minimizes production floor costs, resulting in an excellent cost-efficiency.

Like all selective soldering systems from SEHO, the SelectLine provides a complete hardware and software package for 100% automated process control. The flux quantity monitoring system and gradient-controlled temperature profiles in the preheat area, automatic monitoring of the nitrogen quantity and nitrogen quality, the touchless wave height control or automatic setup control and tool measurement are only some of the monitoring functions that ensure a reliable process.

The SelectLine, however, has even more to offer: The machine can be equipped with a selective brush system for automatic removal of solder balls and an AOI system for automatic inspection of solder joints immediately after the soldering or brushing process. The advantages of these integrated additional processes are obvious: Safe and reliable processes on the one hand, and reduced overall production costs on the other hand.

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With the PowerVision SEHO focusses on two key points in the manufacturing of THT assemblies: Continuous quality assurance and cost-efficient production processes.

The SEHO PowerVision stands for fast, automated optical inspection, and it is particularly designed for THT processes. The system can be configured depending on the manufacturing requirements: For component placement inspection in front of a wave or a selective soldering machine, or for solder joint inspection after wave or selective soldering processes, or as a combination of both inspection tasks, integrated into the same module to save space.

The system reliably detects typical placement defects such as presence of components or polarity, and soldering defects like incomplete solder joints, solder bridges or solder balls, for instance. Additionally, the system is capable of reading and processing product IDs.

The stand-alone variant of the SEHO PowerVision can be flexibly integrated into each fully automated production line. Moreover, the system can be directly integrated in many of SEHO’s selective soldering systems, thus providing additional benefits, particularly in terms of floor space and board handling costs.

Generation of test plans is performed easily and comfortably at any PC using an offline teach program. Basic data can be taken from gerber data, DXF files or from any digital image file (camera or scan). A simple wizard leads the operator through the programming procedure. Moreover, the comprehensive and individually expandable component library includes component-specific test elements, as well as an automatic inspection search to simplify programming.
Even optimization of a test plan that usually requires temporary interruption of the production to adjust parameters can be made offline. Thus, the AOI system will be permanently available for production.

For fast and effective optimization of the entire process, the standard version of the database-supported PowerVision software provides analyzing tools that can draw conclusions on the current production. These tools include a heatmap that visualizes error frequencies based on their geometrical location on the PCB and a trend analysis that effectively supports optimization of the test program. The detected defects can easily and quickly be classified using the intuitive interface of the SEHOverify software.

Based on this classification of the test results, the software module SEHOspc calculates and graphically displays different statistical key figures such as first pass yield, false calls rates or defect rates (FCPMO/DPMO).
The benefits are obvious: Early identification of defects allows a fast increase of the overall manufacturing quality. Simultaneously, production costs can be sustainably reduced due to automated inspection and computer-assisted rework.

Click here to learn more about SEHO PowerVision.

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Golden Nozzle for Golden Results.
New Mini-Wave Solder Nozzle Optimizes the Selective Soldering Process

SEHO developed a new mini-wave solder nozzle that remarkably improves the selective soldering process in many ways. The LongLife solder nozzle is compatible with both SEHO selective soldering systems and different brands.

SEHO’s LongLife solder nozzle is manufactured in a special process without damaging the cubic metal matrix. Contrary to the manufacturing process of a conventional cut surface, this new process does not change the arrangement of atoms at the surface of the nozzle material. Additionally, the mini-wave solder nozzle is coated with a special gold alloy. This combination gives the new solder nozzle some outstanding characteristics.

A particular benefit of the LongLife solder nozzle is its lifetime. Its lifetime is more than three times longer than that of conventional solder nozzles under the same conditions. Therefore, the annual savings potential is remarkable.

The new LongLife solder nozzle, however, has much more to offer:

  • No activation prior to production start.
    Simply insert the nozzle, turn on the pump and start production within a few seconds.
  • No maintenance requirements and no re-activation needed throughout a complete production shift.
    The LongLife solder nozzle ensures a remarkably increased machine availability. Additionally, the costs for typical consumables and chemical activation materials are reduced remarkably.
    The LongLife solder nozzle is even absolutely maintenance-free if it is combined with the ultrasonic nozzle cleaner from SEHO.
  • Highest process stability due to improved heat energy transfer to the solder joints and higher stability of the wave height.
  • Reduced soldering defect rates, as the LongLife solder nozzle permanently features perfect activation.
  • Environmentally-friendly and resource-conserving. Materials usage is remarkably lower, and due to reduced wear and elimination of chemical activation materials, oxides and dross are reduced as well.
  • In combination with the ultrasonic solder nozzle cleaner from SEHO, another very special advantage arises:
    Maintenance staff members and the environment are protected as solvents, chemical activation materials and acids are eliminated from the process.

You want to experience the advantages of the new LongLife solder nozzle for yourself? Just give us a call or send us an Email.

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Markus Walter donates hundreds of respiratory masks to social institutions.

One may ask what a manufacturer of soldering systems and automation technology has to do with respiratory masks. Certainly nothing at first sight, at second glance, however, a globally operating company can use its worldwide contacts to support locally where help is currently most needed.

Due to the worldwide pandemic of the corona virus, the availability of respiratory masks dropped to a critical level. Particularly masks with FFP2 or FFP3 standard that are certified according to EN149 are in very short supply. According to the WHO these respiratory masks provide effective prevention of infection.
Consequently, there is a huge demand in hospitals or nursing services as the nursing staff is working in close contact to patients. Equally huge is the disappointment when respiratory masks are simply not available to protect doctors and nursing staff and enable them to continue to work healthy.

Markus Walter, CEO of SEHO Systems GmbH, gained a first-hand impression of this situation. “Especially for small surgeries and nursing services it is extremely difficult to organize protective clothing. Their staff capacities are not lined out to contact different sources for days just to get another “not available” in the end,” says Markus Walter.
Therefore, he contacted SEHO’s subsidiary in China some weeks ago and the Chinese colleagues were able to buy a large number of respiratory masks from brand manufacturer 3M which immediately were sent to Germany.

The particulate respirators are made with 5 ply protection which are able to resist 95% viruses and bacteria effectively. They are certified according to GB2626-2006 KN95 which corresponds to the European EN149:2001 certification for FFP2 masks.

In the meantime, several hundreds of respiratory masks where distributed free of charge to hospitals in Würzburg and Wertheim as well as nursery services and retirement homes in Wertheim, Külsheim and Tauberbischofsheim. In addition, masks were sent to the SEHO subsidiaries in USA and Mexico.

Especially in these difficult times it is important to show solidarity and not to put own interests first. Thus, SEHO’s initiative was very well received – all of the institutions were more than happy about the unexpected donation.


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Cost-efficient systems help to increase the overall productivity.

The GoReflow-plus convection reflow soldering system represents the ideal solution for SMT productions with medium-sized volumes that attach great priority to high solder joint quality, cost-efficiency and high flexibility. The system convinces with its well-engineered concept, excellent soldering results and an unbeatable price-performance-ratio.

Eight heating zones and an active heated area of 2980 mm provide maximum flexibility in temperature profiling. The GoReflow-plus is designed for soldering in ambient atmosphere and can be operated with local nitrogen inertion in the peak area, depending on the application.

A high volume of circulated process gas, that is generated with axial fans, and special designed slot nozzles ensure a very homogeneous heat distribution over the entire transport width at simultaneously moderate gas velocities. Thus, a very good heat transfer rate is realized, allowing the set temperatures of the oven at a low level.
The programmable fan revolution speed ensures even more flexibility, resulting in perfect solder joint quality.

The GoReflow-plus is equipped with a 3-stage cooling area to cool the assemblies after the reflow process.

A flux management system (process gas cleaning) with stainless steel filter is integrated in the peak and cooling area. Residues are collected in a PE bottle and therefore easy to dispose. This system guarantees low maintenance requirements and high machine availabiliy.

Of course, the GoReflow-plus can be integrated into a fully automated production line. The up-to-date control concept with industry PC and the option to connect to different interfaces, such as IPC-Hermes-9852 or CFX, make the GoReflow-plus ready for future applications.

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Shortage of Stocks for Alcohol-Based Fluxes ?

Flux manufacturers have already reported a remarkable shortage of stocks for alcohol-based fluxes used in electronics manufacturing. Interrupted supply chains and an increasing demand for alcohol as a basis for disinfectants has resulted in massive price increases.

SEHO offers an alternative for a solvent-free alternative – the SEHO PlasmaFluxer. In a plasma process, flux powder is deposited at the solder joints with an outstanding adherence and long-term stability. Simultaneously, product quality can be improved remarkably.

The activation of components and the PCB surface is the key factor to obtain a connection between the solder and the terminations. 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. Alcohol is only needed for application of the flux and needs to be dried off before entering the solder wave. Flux residues are still an issue, particularly due to the increasingly extreme operating conditions electronic assemblies are exposed to. Non-activated flux residues that remain on the assembly may cause severe quality issues or even the complete breakdown of the assembly.

The PlasmaFluxer from SEHO uses cold-active plasma to melt micrometer sized powder of pure adipic acid and deposit it on 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. 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. Once the aerosols touch the surface, the particles solidify and form a long-term stable coating.

The plasma process substitutes the conventional wet-chemical flux activation with a dry process. Soldering results that are achieved with this process are extremely good and they are directly comparable to standard liquid fluxes, even with complicated structures.

An additional advantage is the cleanliness of the PCB surface after the soldering process. Therefore, an additional cleaning process can be avoided. 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. Consequently, maintenance requirements are remarkably reduced while availability of the process equipment is increased.

Solvent-based fluxes are declared as hazardous material (class 3) and special measures are necessary in terms of storage, handling and waste management. 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.

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. As a result, the initial costs for the plasma fluxing system can be made up within a short time.

A particular benefit of the plasma fluxing method is its ability to “revive” overaged PCBs that show perfect wetting results. “The outstanding long-term stability of the flux that has been applied in a plasma process is remarkable,” explains Dr. Andreas Reinhardt, Director R&D at SEHO. “This allows us to apply a flux coating at our Technology Center in Germany and return the boards to customers. The soldering process then can be performed at customer site on their own soldering machine, with the standard fluxer being deactivated.”

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SEHO Systems China Ltd. commenced business operations on 1 January 2020.

SEHO Systems GmbH established a subsidiary in China. With this new subsidiary in Shanghai, SEHO intends to expand its presence in the Asian market and focus on the requirements of its Chinese customers.

SEHO can look back on an exceptionally long and successful business relationship with its local partner company, Toratec, and its customers in China. When Toratec owners Judy Yao and Thomas Raisch went into retirement, SEHO quickly decided to establish its own subsidiary in China. “Over the last few decades, we have had a very close partnership with Toratec and everybody who works there,” says Markus Walter, Managing Director and shareholder of SEHO Systems GmbH. “The Toratec team has a lot of know-how about processes and machines, and of course detailed market knowledge and many customer contacts. These are valuable assets for us, and so we are delighted that the entire team will become an important part of SEHO Systems China.” Chinese customers will benefit from the technical expertise of a committed team of specialists who know the market and its challenges.

SEHO Systems China, Ltd., the new subsidiary, will provide a number of advantages. In addition to providing qualified local support, the most important consumables and parts will be kept on hand locally so they can be delivered to the customers quickly when needed.
Another important milestone will be the launch of an application centre in Shanghai, equipped with SEHO’s innovative soldering systems as well as highlights from the THT-AOI product ranges and automation technology. In addition, the new premises will provide ample opportunity for sharing experience and know-how during seminars and technology forums that will be held there.

“Our Shanghai subsidiary does not only represent the continuation of our involvement in the Chinese market—we will also provide additional resources for our local experts, which will enable them to support customers efficiently in reaching their manufacturing goals, and provide customers with solution-oriented consultation to make them even more successful,” adds Markus Walter, who will head the new subsidiary in Shanghai as CEO. Sandy Liu, who has been with Toratec for many years, will be in charge of technology; Michael Straub will lead the sales team. Both are extremely familiar with SEHO processes and systems and are looking forward to their new roles.


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SEHO PowerSelective wins HELLA Benchmark.

Maximum process and system flexibility while using the smallest possible footprint – this was one of HELLA’s main requirements for a large-scale benchmark test for selective soldering systems. HELLA specializes in vehicle lights and electronics and is among the top 40 automotive suppliers in the world. For this reason, the company also places stringent demands on its system providers in order to safeguard its ability to deliver top-quality technologies at all times.

“The high quality standard of our products is our top priority, regardless of which factory manufactures any given assembly,” says Vinson G. Foo of Operations Industrial Engineering at HELLA in Lippstadt. “The production equipment as well as the manufacturing processes follow international standards, and the process technology specialists from the different factories meet on a regular basis in order to share their experience and establish the worldwide manufacturing strategy,” adds Foo.
For this reason, the large-scale benchmark test in the selective soldering field looked beyond Germany and included aspects of global importance in the decision-making process. The benchmark test spanned one year and involved an intensive cooperation with all well-known soldering system manufacturers.

Vinson G. Foo: “In SEHO, we have a partner at our side who is equally committed to our idea of quality. Our technology partnership is working out very well, and we have the set-up and the flexibility to meet the demands of today and of the future.”

Click here to download the full article, published in Global SMT & Packaging, November 2019.

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SEHO Receives 2019 productronica Innovation Award!

For the third time, the focus in Munich was not only on the leading electronics trade fair. The productronica Innovation Awards, the first independent prize in electronics manufacturing, were presented by a top-class jury of industry experts. SEHO was announced as the winner in the ‘SMT Cluster’. The company won out of more than 30 other applications in this category.

The electronics industry is one of the most dynamic and innovative industries. This is impressively confirmed by the number of entries for the innovation award. A total of 80 entries were made this year – a record number. This prestigious award recognizes in six categories the most innovative new products and manufacturing processes.

„We are very proud to receive the productronica Innovation Award 2019,” says Markus Walter, CEO of SEHO Systems GmbH. “It is our aim to continuously create added value for our customers by constantly improving our machines and existing processes, optimizing them for future applications and implementing innovative ideas. This has been perfectly accomplished with the new SelectLine-C.”

The new SelectLine-C has been designed for the constantly growing requirements in the manufacturing of next-generation products, such as 5G antennas or LED technology. The electronic components used in these next-generation products typically do not conform to usual board dimensions. They are up to 3 m long, or even more, and cannot efficiently be processed with existing manufacturing systems. By means of an automatic software switch the SelectLine-C can be converted from a conventional production mode, where the assembly stops at each station for the duration of the process step, to a continuous mode. While the assembly keeps moving continuously, the axis systems with the process stations travel along and work on the solder joints selectively during the pass. The software automatically coordinates and optimizes the assembly transport and the positioning of the process stations.


As the individual processing stations thereby do not have to match the actual length of the assemblies, the SelectLine-C stands out for its very compact design. This minimizes production floor costs, resulting in an excellent cost-efficiency.

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The perfect solution for small production volumes.

The potential for innovation in electronics makes it one of the most dynamic industries today. Selective soldering has seen a dramatic increase for years, more so than any other soldering process in electronics manufacturing.

A high degree of automation in production typically means large investments in machinery. Especially for the investment in an automated selective soldering process appears unprofitable. However, this perspective changes if automation is not excessive, but adequate. The result is a perfect interplay of man and machine. The priority is on keeping it simple. The operator must be able to understand the processes and know how to operate the system at a glance, what the machine is doing and why.

With these factors in mind, SEHO developed its StartSelective selective soldering system. StartSelective is a ‘plug-and-produce’ selective soldering system for those just entering the automated soldering field, and for anyone looking for a short-term capacity expansion.

Click here to download the full article, published in US Tech, October 2019 issue.

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