AMS2770 Aluminum Heat Treat - Determining Soak Time

M

Mtvated

Hi All,
I have a question in regards to meeting the soak time requirements IAW AMS2770.

AMS2770 soak time requirements were defined as:
1. Use furnace control thermocouples (reflecting the furnace air temperature) to start soak time.
2. Load thermocouples may be used but limited to confirming the parts are within allowable range.
3. When load thermocouples are used to measure aging temperature, the specified soak time shall be used.

It appears the spec is requiring ALL thermocouples to be within the temperature range.

Example: 300F, soak time: 18-20 hours

The concern is in order for the both the load and furnace control thermocouples to be within the 18-20 hours. The furnace controller needs to be set at a lower temperature and allowed time for the load readings to catch up (take hours). Are there any time restrictions of allowing the part to recover prior to the required set point temperature?
 
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