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SMT, PCB Electronics Industry News

News from SEHO Systems GmbH

SEHO's Christian Ott to Present Paper on Voiding at APEX 2012

Jan 26, 2012

Christian Ott

Christian Ott

SEHO Systems GmbH, a worldwide leading manufacturer of automated soldering systems and customer-specific solutions, announces that Christian Ott will present a paper titled “Reduction of Voids in Solder Joints: An Alternative to Vacuum Soldering” during the Voiding 1: Process and Test Technical Session on Tuesday, February 28, 2012 from 1:30-3 p.m. at the San Diego Convention Center in San Diego, CA. The paper, authored by Rolf Diehm, Mathias Nowottnick and Uwe Pape, will discuss voids in solder joins as one of the main problems for power electronics.

The amount of voids can be influenced by different measures, e. g. a good wettability of metallization, solder pastes with special adopted solvents and an adequate preheating profile. However, a special vacuum process step during soldering is demanded for absolutely void free solder joints. But this vacuum process is associated with some essential disadvantages. Besides of the technical expenses for vacuum pumps and additional locks, the vacuum process excludes the use of gas convection for heating and cooling. Apart from a special vapour phase-vacuum technology, most machines are using infrared radiation or heat conduction for soldering.

The same principles as used in vacuum soldering technology are applicable also for a higher pressure level. If the void in the solder joint is arising for an excess pressure, the normal atmosphere pressure could be sufficient for escaping of enclosed gas. Essential for this effect is the pressure difference between inside and outside of solder joint. A benefit of soldering with excess pressure is the possibility of gas convection for heat transfer. This allows the application of conventional components and the realization of the usual temperature distribution and profiles.

For more information, join us at the presentation of this paper on February 28 at 1:30pm at the San Diego Convention Center, or discuss with us at our booth # 3521.

Since its foundation in 1973, SEHO has become the worldwide contact partner whenever soldering is involved. Company solutions are based on performance, flexibility, efficiency and technical progress. SEHO’s business activities and production organization are oriented according to the principles of sustained future-compatible development and production of machines. As a result, all applicable environmental standards are complied with meticulously. With its systems, the company provides customers with a sustained and resource economizing production facility. It continuously develops its technology in order to provide customers with a competitive advantage. For more information, visit

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