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Page 18


www.us-tech.com


September, 2021 ELECTRONIC MFG SERVICES


Verifying Solder Paste with X-Ray Inspection


By Kathryn Cramer S


electing the most effective solder paste for each electronics assembly manufacturing application is critical to success. Choosing


the right one avoids many problems that can re- duce productivity such as tombstoning, beading or voiding. This is why assemblers must develop a close


relationship with their solder paste suppliers, says Henk Mathijssen, area sales and support manager for Cobar. Balver Zinn/Cobar is a man- ufacturer of solder, high-quality anodes, alloys, and wires and is based in Breda, The Nether- lands.


Picking Pastes Since each paste consists of various alloys,


in different particle sizes, combined with differ- ent types of flux, each combination reacts differ- ently to the reflow process. Selecting the right combination for each application is a collabora- tive endeavor that involves the end user’s speci- fications, the assembler’s procedures and the solder paste supplier’s expertise. “The technical team will review the applica- tion in detail with the customer. Based on the


collected data, the best possible recommenda- tion will be made,” says Mathijssen. “If there are still unknown factors, a certified technical spe- cialist will give support during production start- up.”


Cobar has been producing solder paste


since the 1980s. As production requirements have changed, like the shift to lead-free alloys, the company has developed its range of pastes. New pastes expand a manufacturer’s range of options for specific applications and different in- dustries, such as automotive or medical prod- ucts, LEDs, double-sided assemblies, or multi- layered circuit boards. A single paste may work for most applica-


Glenbrook Technologies’ Jewel Box 70T X-ray system.


tions, but having access to other formulations allows assemblers to expand their capabilities. Continuous research and product refinement has been key to keeping Cobar at the forefront of the market, offering pastes that include the widely used SAC305, a new multi-alloy incorpo- rated into a new flux platform branded JEAN- 151 and next-generation LMPAs (low melting point alloys).


Continued on next page


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