Titanium grade 2 (ERTi-2) alloy is commonly referred to as commercially pure (C.P.) titanium with the level of impurities and mechanical properties increasing slightly from ERTi-1 to ERTi-4. C.P.
Titanium grade 2 Welding Rods Filler Metal is used for gas-tungsten-arc-welding (GTAW), gas-metal-arc-welding (GMAW) and plasma-arc-welding (PAW).
Titanium Grade 2 is the most widely used titanium alloy for industrial applications because of its good balance of strength, formability, and weldability.
Applications: Titanium Grade 2 is typically used in seawater and brackish water heat exchangers, chemical process heat exchangers, pressure vessels and piping systems, pulp bleaching systems, air pollution control scrubbers, and electrochemical and chemical storage tanks. These grades also have some uses in the aerospace industry.
Typical Chemical Compositions %:
C 0.03 - O 0.10 - N 0.020 - H 0.008 - Fe 0.20 - Ti rem.
Typical Mechanical Properties:
Tensile strength: 340 MPa (50,000 psi)
Yield strength: 275 MPa (40,000 psi)
Elongation: 20 %
Filler metals available in spools and in cut straight lengths in a variety of sizes and diameters.
The procedures and equipment are generally similar to those used for welding stainless steel or aluminum. Titanium and titanium alloys are extremely reactive and sensitive to embrittlement by oxygen, nitrogen, and hydrogen, above 315°C (600°F). Additional precautions, exceeding those required during the welding of austenitic stainless steel or aluminum alloys, must be taken to shield the weld and hot root side of the joint from air. In welding titanium or titanium alloys, only argon and helium, and occasionally a mixture of these two gases, are used for shielding. The filler metal composition is usually matched to the grade of titanium being welded. The filler metal and the base metal should be meticulously cleaned at the time of welding. Grease and oil accumulated during forming and machining must also be removed before welding to avoid weld contamination. If the hot end of the filler metal is removed from the gas shield prior to cooling and then reused, it contributes to weld contamination. Welding rod should be added by technique that keeps the hot end within the torch gas blanÂ¬ket. If the rod tip becomes contaminated, the discolored end should be cut off before reusing.
Welding can also be done remotely in a chamber or in a glove bag. These chambers can be purged of air and back filled with inert gas, or, if they are rigid gas tight walls, can be evacuated to at least 10-4 torr [0.013 Pa] to remove any air contaminants.