Causes and Solutions of Unqualified Mechanical Properties of High Strength Aluminum Alloy 6063 (LD31) Aluminum Alloy

[China Aluminum Network] reasons:

1, when the extrusion temperature is too low, the extrusion speed is too slow, the profile extrusion temperature in the extruder can not reach the solution temperature, solid solution strengthening effect;

2. There are few fans at the outlet of the profile. The amount of air is not enough. Causes slow cooling. The profile cannot be lowered below 200C in a short period of time. Precipitates coarse Mg2Si prematurely. So that the solid solution phase is reduced. Affects the mechanical properties of the profile after heat treatment;

3, ingot composition is not qualified, the ingot in the Mg, si content does not meet the standard requirements;

4. The ingot is not homogenized, so that the Mg2sj phase precipitated in the ingot structure cannot be re-dissolved within a short time of extrusion, resulting in insufficient solid solution and affecting the product performance;

5, improper aging process, hot air circulation is not smooth or thermocouple installation position is not correct, resulting in inadequate aging or over-ageing.

Solution:

1. Reasonably control the extrusion temperature and extrusion speed to keep the profile at the outlet temperature of the extruder above the lower solution temperature;

2. To intensify the air-cooling conditions, conditional factories can install atomized cooling devices in order to achieve the lower requirements of 6063 alloy cooling gradients:

3. Strengthen the quality management of the ingot;

4. Homogenize the ingot;

5. Reasonably determine the aging process and correctly install the thermocouple. Properly arrange profiles to ensure smooth circulation of hot air.

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