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UltraFlex performs fast and energy-efficient induction brazing for research purposes
The test applications set up by UltraFlex proved the possibility to use induction heating to efficiently braze parts of different size and material.
UltraFlex is partnering with many research organizations and Universities to support the research they are undertaking. The recent research test setup performed, which required brazing Kovar to stainless steel, molybdenum to stainless steel, alumina ceramic to Kovar, and stainless steel to stainless steel, aimed at identifying the suitable induction coils, heating parameters and brazing flux/paste required for a high-quality braze.
A key requirement for the process was to keep the brazing temperatures between 850 and 1200°C, and have a heat cycle of maximum 5 minutes. Hence, an UltraFlex induction heater from the UltraHeat SBT series was considered most appropriate for this heating scenario. UltraFlex UltraHeat SBT are high-frequency induction heaters, using frequency of 700 kHz – 1.2 MHz for soldering and brazing small components and parts such as circuit board connectors, RF Connectors, and cable end connectors. They feature advanced, efficient power supplies utilizing the latest switching power supply technology.
With power of between 370 and 480 W applied, the brazing for 3 of the 4 test setups took between 25 and 45 seconds. The brazing for the alumina ceramic to Kovar took 1.5 minutes using 400 W of power, but the process allowed to make specific conclusions regarding possible optimization of the heating in the future. The brazing flux to be used in each of the brazing cases was also successfully confirmed.
The test applications set up by UltraFlex proved the possibility to use induction heating to efficiently braze parts of different size and material. Thanks to the digital control of UltraFlex induction heaters, the brazing process can be set up precisely and process optimizations can be easily identified. Due to the energy-efficiency of the process, multiple test setups for research purposes can be accomplished at high cost-efficiency. Finally, the lack of open flame, smoke and noxious emissions would guarantee a completely safe brazing process for any research specialists involved in it.
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