TA4G (ERTi-4) Commercially Pure Titanium Welding Wire

TA4G is a Chinese grade of commercially pure titanium in welding-wire form, corresponding to AWS A5.16 ERTi-4 / ASTM Grade 4 / UNS R50700 / DIN 3.7065. With the highest oxygen content of the CP grades, Grade 4 offers the highest strength while retaining good ductility, corrosion resistance and biocompatibility.

Overview

• Material: TA4G — CP titanium welding wire / fastener stock
• International equivalent: AWS A5.16 ERTi-4 / ASTM Gr.4 / UNS R50700
• Typical forms: straight wire and coiled wire (for TIG/MIG); bar and coil for fasteners

Chemical Composition (wt%)

Other elements: each ≤ 0.10 %, total ≤ 0.40 %.

Physical Properties

Mechanical Properties (per source — please verify)

Key Features

• Low density for effective weight reduction;
• Relatively high strength capable of carrying substantial loads;
• Good corrosion resistance against many chemicals;
• Good plasticity and formability;
• Good biocompatibility.

Fabrication & Heat Treatment

• Melting: typically double vacuum melting, including at least one vacuum arc remelting (VAR); castings are often made in a vacuum shell-mould furnace.
• Hot working: forged, extruded, rolled or drawn at 800–900 °C in a neutral or slightly oxidising atmosphere.
• Cold working: intermediate annealing is required when cold reduction reaches 30–60 % to restore ductility and strength.
• Welding: TIG, plasma or resistance welding; good post-weld properties.
• Annealing: 670–720 °C for 0.5–2 h to relieve residual stress and improve ductility / toughness.
• Stress-relief annealing: 530–550 °C for 0.5–1 h, or 470–490 °C for 2–4 h, to reduce stress concentration and improve stability.

Typical Applications

• Aerospace: aircraft frames, skin and engine accessories;
• Shipbuilding: seawater-resistant piping, valves and pumps;
• Seawater desalination: heat exchangers, pump bodies and distillation columns in desalination systems;
• Chemical industry: heat exchangers, reaction towers and reactors;
• Biomedical: dental implants and medical devices;
• Welding consumable: filler wire (ERTi-4) for higher-strength CP titanium fabrication.

For detailed datasheets, mill certificates or inquiries on wire diameters, spooling and packaging, please contact our sales & engineering team.