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Brand nameofa wave soldering system developed by Seho(Germany) where the soldering operationoccurs ina nitrogen atmosphere. The deviceis gas-tightand providesa residualoxygen concentration of10 ppm, which prevents the oxidation of thesolderduring soldering.Sometimes formic acid is added whichcontains an aldehyde groupandacts therefore as areducing agent. At 160°C, itsplitsinto carbon dioxide(CO2) andhydrogen, whichpromotesthe reductioneffect. Becausethe solderdoes not oxidize, there is no riskof cloggingof thesolder nozzlebydross. All in all, this system offers a soldering method that uses no or hardly any flux. See also Wave soldering.