AMS 4951 Aerospace Gr2 Titanium Wire Description
Product Introduction
AMS 4951 Gr2 aerospace titanium wire is a CP titanium wire conforming to AMS 4951 for aerospace welding applications. The specification defines stringent requirements for chemical composition, cleanliness, and feedability specific to TIG/MIG welding of aerospace titanium structures. Gr2 (UNS R50400) delivers higher strength than Gr1 while retaining excellent weldability. The highest-volume CP titanium welding grade in aerospace. Used for quality-critical welding of aircraft airframes, engine peripheral components, and spacecraft titanium assemblies. Available from φ0.5 mm to φ6.5 mm, as straight wire or coil.
Technical Specifications
1. Basic Information
Product Name | AMS 4951 Aerospace Gr2 Titanium Wire |
Grade Equivalents | AMS 4951/ASTM Gr2/UNS R50400/ERTi-2 |
Standards | AMS 4951, ASTM B863, AWS A5.16 (ERTi-2) |
Supply Forms | Straight wire, Coil wire |
Surface Conditions | Bright finish, Cleaned |
Diameter Range | φ0.5-φ6.5 mm |
Straightness | ≤2/1000 |
2. Chemical Compositions
Ti | Fe | C | N | O | H | Y | Total Impurities |
Balance | ≤0.30% | ≤0.08% | ≤0.03% | ≤0.25% | ≤0.015% | ≤0.005% | ≤0.40% |
3. Mechanical Properties
Tempers | UTS (MPa) | YS (MPa) | Elongations (%) |
Annealed | ≥ 345 | ≥ 275 | ≥ 20 |
4. Physical Properties
Properties | Values |
Density | 4.51 g/cm³ |
Melting Point | ≈1668°C |
Coefficient of Thermal Expansion | 8.6×10⁻⁶/°C |
Thermal Conductivity | ≈15.2 W/(m·K) |
Magnetic Properties | Non-magnetic |
Max. Service Temperature | ≤300°C continuous; ≤450°C short-term |
Features and Advantages
- AMS 4951 certified: Welding wire specification purpose-built for aerospace titanium structure welding with full traceability.
- Balanced strength and ductility: ERTi-2 certified; deposited metal combines strength with ductility; wide welding process window.
- Dense, sound welds: Tight chemistry and cleanliness controls produce welds that pass aerospace X-ray and fluorescent penetrant NDT.
- Proven aerospace volume: The most commonly used CP titanium welding wire in aerospace with extensive application experience.
- Consistent wire feeding: Tight diameter tolerance and good straightness; compatible with automated TIG/MIG welding systems.
- Lot-to-lot consistency: Aerospace-grade quality control with material certification per batch; reproducible welding procedures.
Performance Solutions
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A. Problem: Industrial-grade wire lacks cleanliness, causing slag inclusions and porosity that drive high aerospace weld rejection rates.
Solution: AMS 4951 Aerospace Gr2 Titanium Wire meets aerospace cleanliness standards. Welds pass X-ray and fluorescent penetrant inspection with dramatically improved acceptance rates.
B. Problem: Filler wire composition does not match titanium parent metal, producing joints with lower strength than the base material. Solution: AMS 4951 Aerospace Gr2 Titanium Wire has tightly controlled composition. Weld properties fully match Gr2 parent metal. Joints are reliable.
C. Problem: Surface contamination on welding wire causes aerospace weld embrittlement — a critical flight safety risk.
Solution: AMS 4951 Aerospace Gr2 Titanium Wire undergoes rigorous cleaning and clean packaging. No surface oils or contaminants. Embrittlement eliminated.
D. Problem: Conventional wire with high diameter variation jams automated feeders, reducing welding efficiency.
Solution: AMS 4951 Aerospace Gr2 Titanium Wire holds ±0.03 mm diameter tolerance. Feeds smoothly. Compatible with aerospace automated welding lines.
Applications
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A. TIG welding of airframe frames, bulkheads, skin supports, and engine peripheral titanium alloy assemblies. AMS 4951 certified with full traceability. Meets FAR/CS airworthiness requirements.
B. Precision welding of satellite propulsion system lines, rocket propellant tanks, and spacecraft titanium alloy assemblies. Dense, low-leak-rate welds suited for high-vacuum applications.
C. Welding of engine peripheral titanium piping, brackets, and housings. High cleanliness with weld properties matching parent metal.
D. Welding of bleed-air ducts, heat exchangers, and exhaust system titanium alloy components. Stable performance under high-temperature oxidation and fuel exposure.
E. Repair welding of aircraft structural components and engine parts. Composition match, high weld strength, and high repair acceptance rates.