Titanium fasteners (such as titanium bolts and nuts) are widely used in aerospace, marine engineering, and other fields due to their high strength, corrosion resistance, and lightweight properties.
Pre-Installation Preparation
1. Material Compatibility Check
Confirm that the fastener material is compatible with the connected parts to avoid galvanic corrosion.
Check that the threads are clean and undamaged to prevent seizure or stripping during installation.
2. Tool Selection
Use a dedicated torque wrench to avoid over- or under-tightening with a standard adjustable wrench.
In high-temperature environments, nickel-based washers are required to prevent creep.
Key Operations During Installation
1. Lubrication and Anti-seizure
When titanium fasteners come into contact with aluminum alloys, apply molybdenum disulfide lubricant to prevent high-temperature friction and seizure.
Do not reuse washers to prevent uneven preload due to deformation.
2. Torque Control
Tighten to the standard torque value. Overtightening can easily cause thread stripping.
Long bolts should be tightened against the nuts to prevent twisting and winding.
3. Assembly Sequence: When tightening multiple bolts, tighten them in a cross-threaded, symmetrical sequence to ensure even load distribution.
Maintenance and Inspection During Use
1. Regular Inspection
Inspect chemical equipment for corrosion every six months, with a particular focus on welds and areas of stress concentration.
When inspecting flange connections, confirm that the seals are free of deformation and cracking.
2. Anti-loosening Measures
Preferably use self-locking nuts or titanium bolts pre-coated with anaerobic adhesive to enhance vibration resistance.
Avoid using ordinary titanium alloys in environments that are electromagnetically sensitive.
Common Misconceptions and Risk Avoidance
1. Avoid Substituting Coarse for Fine: Fine-thread bolts should not be replaced with coarse threads, as this can cause them to loosen and break.
2. Prohibit Rough Disassembly: Use specialized tools and avoid knocking or forceful disassembly.
3. Environmental adaptability: In high humidity or corrosive media, Gr1/Gr2 industrial pure titanium should be used instead of Gr5 alloy.
