Thick aluminum alloy plate quenching

The purpose of quenching the aluminum alloy plate is to obtain a supersaturated solid solution and create the necessary conditions for subsequent aging strengthening.

The error of the salt bath furnace temperature control system does not exceed 2°C.

The brine level should be 150 mm higher than the top of the aluminum plate and the height of the heater above the liquid level should not exceed 350 mm.

When changing alloys, modifying set temperature, or adding hydrochloric acid, the salt solution must be kept at the set temperature for more than 30 minutes after reaching it, and production can resume only after the temperature measurement meets the requirements. Check the set temperature of the furnace on time, modify the set temperature, and the heating time.

According to the quenching process requirements, check the salt bath furnace temperature and heating time on time, and handle any abnormalities in a timely manner.

Aluminum plates with water are absolutely not allowed to be added into the furnace. Quenching aluminum plates cannot be placed on heating elements. After the aluminum plates are put into the furnace, relevant records need to be made, and the insulation time starts to be calculated when the furnace reaches the fixed temperature.

Ensure the quenching transfer time. The quenching transfer time of high zinc aluminum alloy shall not exceed 25 seconds, and other alloys shall not exceed 30 seconds. For medium and thick aluminum plates, repeated quenching is allowed.