Why Titanium Demands Special Fabrication Procedures

Titanium and titanium alloys offer exceptional strength-to-weight ratios, outstanding corrosion resistance, and excellent biocompatibility. However, these same properties that make titanium valuable also make it one of the most challenging metals to fabricate. Titanium’s high reactivity with oxygen and nitrogen at elevated temperatures, its springback characteristics, and its galling tendency require specialized procedures throughout fabrication. This guide covers complete best practices for titanium pipe and tube fabrication in 2026.

Titanium Pipe and Tube Grades

Storage and Handling

Contamination Prevention

• Store titanium separately from carbon steel — any iron contamination causes galvanic corrosion
• Use dedicated work areas with clean floors and tables
• Handle with clean cotton or nylon gloves (never bare hands — sweat causes staining)
• Use titanium-dedicated tools (grinding wheels, wire brushes, cutting blades)

Surface Protection

• Keep protective film on during fabrication where possible
• Use non-marking urethane or nylon dies for forming operations
• Avoid contact with copper-containing alloys during forming

Cutting Methods

Saw Cutting

• Band saw: Bi-metal blades with 3-4 TPI, slow speed (60-90 m/min), generous cutting fluid
• Circular saw: Carbide-tipped blades, flood coolant
• Lathe cutting: For precise cutoff, use positive rake angles and steady rests

Abrasive Cutting

• Use dedicated grinding wheels (never previously used on steel)
• Aluminum oxide or silicon carbide wheels
• Generous coolant flow to prevent overheating and oxygen absorption

Laser Cutting

• Fiber lasers preferred for titanium (better absorption)
• Nitrogen or argon assist gas (never oxygen — causes fire risk)
• Proper fume extraction mandatory (titanium fume is combustible)

Plasma Cutting

• Use dedicated plasma systems with argon-H₂ or argon-N₂ mixtures
• Water table cutting recommended to contain titanium particles
• Not suitable for thin-wall tube (excessive heat input)

Bending and Forming

Cold Bending

• Grade 1 and 2 can be cold bent to minimum 3x OD radius (soft annealed condition)
• Grade 5 (Ti-6Al-4V): Minimum 5x OD radius cold, due to lower ductility
• Use mandrel bending to prevent wall collapse in thin-wall tube
• Springback is significant: Grade 2 ~6°, Grade 5 ~10° — compensate by overbending

Hot Bending

• For tighter radii or higher-strength grades
• Temperature range: 540-700°C (1000-1300°F)
• Critical: Must use inert gas (argon) shielding during hot bending to prevent oxygen/ nitrogen pickup
• Local induction heating with trailing argon blanket is the preferred method

Hydroforming

• Excellent for complex shapes in titanium tube
• Hydraulic pressure at room temperature or elevated temperature
• Produces uniform wall thickness with minimal springback

Welding Titanium Pipe and Tube

GTAW (TIG) — Primary Method

• DC straight polarity (DCEN)
• Pure argon shielding (99.996% minimum)
• Trailing shield MANDATORY — protects hot weld and HAZ as it cools below 540°C
• Back purge required for pipe/tube (argon on inside)
• Ceriated or lanthanated electrodes (no thoriated — environmental/safety)

Shielding Requirements

Titanium must be shielded on all surfaces until cooled below 425°C (800°F):

• Primary shield: Torch cup with argon flow 15-25 CFH
• Trailing shield: Minimum 150mm long trailing device, argon 10-15 CFH
• Back purge: Argon 5-10 CFH, maintained until weld fully cooled
• Enclosure: For critical applications, use a purged enclosure (glove box or chamber)

Weld Color as Quality Indicator

Filler Metal Selection

• Generally match base metal grade (Grade 2 filler for Grade 2 pipe)
• Grade 2 filler can join Grade 1 to Grade 2
• Grade 5 (ERTi-5) for Ti-6Al-4V applications
• Store filler wire in clean, sealed containers (desiccant recommended)

Machining Titanium Tube

Key Challenges

• Low thermal conductivity — heat concentrates at cutting edge
• High chemical reactivity — tendency to gall and seize on tooling
• Elastic recovery — springback affects dimensional accuracy

Best Practices

• Use sharp carbide tools with positive rake angles
• Generous flood coolant (soluble oil or synthetic, high concentration)
• Moderate cutting speeds (30-60 m/min for turning)
• Consistent feed rates — never dwell (causes work hardening)
• Rigid setup to minimize vibration

Surface Treatment After Fabrication

• Pickling: HF + HNO₃ solution removes scale and alpha case
• Passivation: Nitric acid treatment restores protective oxide layer
• Electropolishing: Removes alpha case and improves surface finish
• Abrasive blasting: Glass bead blasting for uniform matte finish

CoreMetal Steel: Titanium Pipe and Tube

CoreMetal Steel supplies titanium pipe and tube in Grade 1, 2, 5, 7, 9, and 12 per ASTM B337, B338, B861. Seamless and welded options, full size range, complete mill test certificates.

Contact: Tracy | tracy@coremetalsteel.com | +86 18291910632

Conclusion

Titanium pipe and tube fabrication requires specialized procedures for contamination prevention, shielding, and process control. Following these best practices ensures component integrity and maximizes titanium’s performance advantages. Visit CoreMetal Steel Blog for more resources.