Titanium fasteners (such as titanium bolts and nuts) may cause metal adhesion (biting) during assembly due to frictional heat, affecting disassembly and maintenance. The following is a systematic solution:

1、 Analysis of the cause of biting death

1. Material characteristics

Titanium alloy has high ductility and poor thermal conductivity, and frictional heat is prone to accumulate, damaging the surface oxide layer and causing direct contact and adhesion of the metal.

2. Process factors: High speed tightening, excessive torque, or assembly tilting can intensify frictional heat and cause instantaneous locking.

2、 Prevention and solution measures

1. Material and lubrication optimization

Heterogeneous material combination: titanium bolts are matched with steel nuts to reduce the risk of adhesion by utilizing the difference in hardness.

High performance lubricant: coated with molybdenum disulfide or fluoropolymer, resistant to high temperatures and reducing friction coefficient.

2. Assembly process control

Torque management: Tighten according to standard torque and prohibit high-speed assembly of electric tools.

Vertical rotation: Ensure that the deviation between the bolt and nut axis is ≤ 2 ° to avoid eccentric force.

Low speed assembly: It is recommended to maintain a speed of less than 25rpm to control the accumulation of frictional heat.

3. Surface treatment and maintenance

Cleaning threads: Remove oxide scale and metal debris before installation to ensure surface roughness Ra ≤ 3.2 μ m.

Disable duplicate parts: The disassembled titanium fasteners need to be forcibly replaced due to pre deformation.

Gasket buffer: Install flat washers to disperse axial stress and reduce direct contact pressure between threads.

3、 Special scenario response

High temperature environment: Use high-temperature resistant lubricants and wait for the components to cool to room temperature before disassembling.

In the aviation field, TA1 pure titanium or specialized coatings are used to avoid issues with biocompatibility and fatigue performance.

4、 Technology Extension

Process validation: Elo Titanium's local annealing technology can optimize the surface hardening layer of titanium fasteners and reduce the risk of biting.

Localization progress: Tiancheng Aviation Materials' high-purity titanium alloy materials have been used in aviation fasteners to improve reliability.

Summary: Through comprehensive control of materials, processes, and maintenance, the problem of titanium fasteners biting can be effectively avoided, ensuring connection reliability.