What are the reasons for the poor condition of titanium alloy screws?

Poor performance of titanium alloy screws can affect their effectiveness, and it is important to promptly address any issues discovered. What specific reasons can lead to various adverse situations of titanium alloy screws? Now let me analyze and introduce it to you.

1. The head of titanium alloy screws is not round, and the normal cause of this situation is that the screw mold is not fully formed during the punching process or the punching die is not selected properly.

2. There may be three reasons for the occurrence of burrs or rough edges on the surface of screws. One is that the pores are too large during the punching process. The second is that the punching rod is too short, which can also cause rough edges on the surface of screws. The third is due to poor punching.

3. The head of the titanium alloy screw is twisted, which is mainly caused by improper machine adjustment, or it may be due to poor installation of the screw mold.

4. If cracks or fissures appear on the head of the screw, it is generally due to quality issues with the material itself. Therefore, before starting the screw wire, the quality department must inspect it.

Improper use (assembly)

Even if the screws themselves are qualified, incorrect use can lead to failure.

Special lubricant was not used during assembly

Reason: Dry twisting or use of inappropriate lubricants.
Adverse phenomenon: It almost inevitably leads to thread biting.

Reason for improper tightening torque:

Insufficient torque: Insufficient pre tightening force can cause screws to loosen easily under vibration loads.
Excessive torque: causes the screw to yield, resulting in plastic deformation, and even direct breakage, or poses a risk of fatigue fracture.
Adverse phenomena: looseness, breakage, and thread slippage.

Galvanic corrosion between different materials

Reason: Titanium alloy comes into direct contact with electrolytes (such as seawater) with metals such as aluminum and steel that have significant potential differences.
Adverse phenomenon: Although titanium itself is corrosion-resistant, it can accelerate the corrosion of aluminum or steel parts connected to it.

Cross threaded or skewed assembly

Reason: It was not aligned during assembly and forcibly screwed in.
Adverse phenomenon: Damaged threads, resulting in biting or increased local stress.