The aerospace and defense sectors demand stringent tests on their components, so they created an industry-driven program designed to certify organizations working in these sectors. Furnaces that meet this standard are thermal processing components certified by the National Aerospace and Defense Contractors Accreditation Program (NADCAP). The criteria to bring a furnace to NADCAP standard are established by qualified experts in the aerospace sector and vary based on the specific process.
This article will go further in-depth about the purpose of NADCAP certification and the latest specifications for NADCAP furnaces:
The Purpose of NADCAP Accreditation
The process of NADCAP accreditation begins with the Performance Review Institute (PRI). PRI administrators help suppliers tighten controls of their processing route by giving an industry-recognized standard for conformity throughout the aerospace sector.
They organize extensive audits at regular intervals, performed by qualified professionals, to ensure that norm compliance is maintained within the aerospace and defense sector.
Outlining NADCAP Furnaces
AMS 2750 covers the specific accreditation for NADCAP furnaces. This standard defines the pyrometric requirements for instruments used in the heat treatment of aluminum components. Fully-constructed furnaces can be certified to AMS 2750, as can the individual components such as thermocouples, metallic heating elements and ceramic insulation.
The latest specification (AMS 2750E) for NADCAP furnaces outlines the various instrumentation types based on the quality requirements of the furnace. Type A refers to the most precise thermal monitoring requirements with a direct attachment between the controller and each control zone via distinct thermocouples, over-temperature protection units for all control zones and sensors for recording both the coldest and hottest points in the thermal processing chamber.
An additional classification for NADCAP furnaces is their temperature uniformity. Starting at class 1, this class of furnaces has a temperature uniformity of +/- 3 °C (+/- 5 °F). The lowest classification is class 6: a NADCAP furnace at this level would display a thermal uniformity of +/- 24 °C (+/- 50 °F).
NADCAP Furnaces from Thermcraft
Thermcraft has extensive experience in producing furnaces and thermal processing equipment for the aerospace and defense sector. Thermcraft engineered and supplied a NADCAP accredited Multi-Door Recirculating Oven with a large internal heating chamber and a maximum operating temperature of 177 °C (350 °F).
The furnace complies with AMS 2750 specification with a thermal uniformity of +/- 6 °C (+/- 10 °F). To keep this NADCAP accreditation, the furnace is required to reproduce these AMS 2750E conditions during regular and extensive auditing.
Thermcraft’s thermal processing equipment is built for maximal service longevity in exacting industrial environments, to deliver the best return on investment and ensure that your furnace meets the stringent requirements of the industry.
This information has been sourced, reviewed and adapted from materials provided by Thermcraft, Inc.
For more information on this source, please visit Thermcraft, Inc.