AWS Class ERTi-2 MIG & TIG

AWS A5.16 ERTi-2 (Titanium Grade 2) TIG Filler Rod & MIG Wire Supplier in India

Name: AWS Class ERTi-2 MIG & TIG
Brand: Nicorex Alloys

Nicorex Alloys is an ISO 9001 and ISO 14001 certified Mumbai-based supplier and stockist of ERTi-2 titanium welding wire, classified under AWS A5.16 / ASME SFA-5.16. It is classified as UNS R50120 and AMS 4941.

ERTi-2, also known as Titanium Grade 2 filler wire, CP-Ti Grade 2 TIG rod, STi-0120, or unalloyed titanium filler rod, is the most commonly used commercially pure (CP) titanium filler metal worldwide. Its minimum tensile strength of 345 MPa (50 ksi) satisfies all CP titanium code requirements. The controlled oxygen content (0.08-0.16%) keeps the weld metal ductile enough for orbital welding and tube-to-tubesheet joints. ERTi-2 is used for GTAW (DCEN) and GMAW (DCEP) with 100% argon shielding gas (99.995% UHP). A back purge and trailing shield are mandatory and must be maintained until the weld cools below 427°C (800°F). ERTi-2 (Titanium Grade 2) is a TIG and MIG filler metal for welding commercially pure titanium where high corrosion resistance and moderate strength are required. ERTi-2 is a cost-effective choice because it gives enough strength for pressure vessels, piping and heat exchangers while still being easy to form and weld. It is supplied as TIG rods in several diameters, packed in sealed tubes and as MIG wire on vacuum-sealed spools in different sizes.

ERTi-2 is a TIG and MIG filler metal used for welding commercially pure titanium alloys in applications that demand high corrosion resistance and moderate mechanical strength. We supply these rods and wires with EN 10204/3.1B mill test certificates covering full interstitial analysis.

ERTi-2 Welding Wire Specifications

This table explains the AWS classification ERTi-2, detailing electrode designation and the titanium base element.

AWS Classification	ERTi-2
UNS	R50120
Welding Processes	GTAW (TIG), GMAW (MIG), PAW
Polarity	(GTAW): DCEN (GMAW): DCEP
Shielding / Back Purge	100% Argon 99.995% UHP; back purge mandatory
TIG Rod Diameters	1.0, 1.6, 2.0, 2.4, 3.2, 4.0 mm
MIG Wire Diameters	0.8, 0.9, 1.0, 1.2, 1.6 mm

AWS Classification Explained: What Does ERTi-2 Mean?

This table explains the AWS classification ERTi-2.

Component	Identifier	Meaning
ER	Electrode / Rod	Indicates the wire can be used as a continuous Electrode (GMAW/MIG) or a cutoff Rod (GTAW/TIG).
Ti	Titanium	Identifies Titanium as the primary base element of the alloy.
2	Grade 2	Specifies the chemical purity level. Grade 2 is “Commercially Pure” (CP) and is the most widely used titanium grade.

ERTi-2 is widely used because its 345 MPa strength meets almost all CP titanium pressure code requirements, and its controlled oxygen level keeps the weld flexible for orbital and thin-wall tube welding.

Chemical Composition of ERTi-2 Wire per AWS A5.16

This table presents chemical composition limits of ERTi-2 wire per AWS A5.16, it includes interstitial elements and titanium balance requirements.

Specification	Nitrogen (N)	Carbon (C)	Hydrogen (H)	Iron (Fe)	Oxygen (O)	Titanium (Ti)
AWS A5.16 ERTi-2 Requirement (%)	0.015 max	0.03 max	0.005 max (rod); 0.008 max (electrode)	0.12 max	0.08–0.16	Remainder

Oxygen is tightly controlled between 0.08-0.16%. The low end ensures enough weld strength, and the high end avoids loss of ductility. The Fe limit (0.12% max) is lower than in the Grade 2 plate (0.30%), so the weld metal stays cleaner than the base metal.

All-Weld-Metal Mechanical Properties of ERTi-2 TIG Welding Rod

This table summarises all-weld-metal mechanical properties of ERTi-2, including tensile strength, yield strength, elongation, and hardness per AWS A5.16 standards.

Specification	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
AWS A5.16 Minimum	345 MPa (50 ksi)	Not specified	Not specified	Not specified
Typical	380–420 MPa	~275 MPa (40 ksi)	~20%	~160–200 HV

ERTi-2 weld strength (345 MPa) matches Grade 2 titanium, so it’s a true matching filler. Any air contamination makes the weld hard and brittle, so pure shielding gas is essential.

Base Metal Compatibility and ASME Section IX Data for ERTi-2

This table shows which titanium grades ERTi-2 can weld, along with their UNS numbers and P-Numbers.

Base Metal	UNS	P-No.	Notes
Grade 1 (CP Ti)	R50250	P-51	Overmatch (~345 vs ~240 MPa)
Grade 2 (CP Ti)	R50400	P-51	Matching, primary application
Grade 7 (Ti-0.2Pd)	R52400	P-52	No Pd in weld; ERTi-7 for full Pd benefit
Grade 12 (Ti-Mo-Ni)	R53400	P-52	ERTi-12 preferred for matching corrosion

Recommended Welding Parameters for Titanium ERTi-2 TIG & MIG Wire

The following are the recommended welding parameters for ERTi-2 titanium wire using GTAW (TIG) and GMAW (MIG): the table below shows the ranges for welding current, voltage, and shielding gas flow, so you can easily choose suitable settings for your application.

GTAW (TIG) using DCEN with 100% Argon (99.995% UHP):

Wire Dia.	Amps (A)	Volts (V)	Gas Flow (L/min)
1.0 mm	30–70	8–12	10–12 primary, 5–8 purge
1.6 mm	60–120	10–14	10–15 primary, 5–10 purge
2.4 mm	100–180	12–16	12–15 primary, 8–10 purge
3.2 mm	150–250	14–18	15–18 primary, 8–12 purge

GMAW (MIG) using DCEP for thicker sections:

Wire Dia.	Amps (A)	Volts (V)
0.9 mm	90–150	18–22
1.2 mm	130–220	20–26
1.6 mm	180–280	22–28

ORBITAL TIG (automated tube-to-tubesheet):

Tube OD	Wall Thickness	Amperage (A)	Travel Speed	Notes
19–25 mm	0.7–1.2 mm	30–60	Per orbital programme	Full ID purge mandatory
25–51 mm	1.2–2.5 mm	50–100	Per orbital programme	Back purge + trailing shield

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Industrial Welding Applications of ERTi-2 (Titanium Grade 2) Filler Wire

ERTi-2 is specified wherever CP titanium fabrication requires code compliance and corrosion resistance at competitive cost.

Chemical Processing: Used to fabricate and repair titanium heat exchangers, reactors, columns, condensers, piping, and valves for oxidising services where stainless steel pits. Tube-to-tubesheet welds in titanium exchangers are a major application.
Desalination: Multi-Stage Flash (MSF) and Multi-Effect Distillation (MED) plants use Grade 2 titanium tubing welded with ERTi-2 for evaporators, brine heaters, and condensers.
Power generation: ERTi-2 is used for condenser tubing and tubesheet welding in fossil, nuclear, and geothermal power plants. It is also used in FGD scrubbers, reheater tubes and ductwork.
Offshore oil & gas: ERTi-2 is used in seawater cooling systems, fire water piping (NORSOK M-001 compliant), topside process equipment, and subsea heat exchangers.
Marine: ERTi-2 is used for hull fittings, propeller shafts, seawater pipes, openings in submarine hulls, cooling systems on naval ships, and frames for offshore fish farming cages.
Pulp & Paper: Used in bleach plant equipment such as ClO₂ generators, washers, filtrate tanks, and piping exposed to wet chlorine.
Pharmaceutical & Food: Applied in reactors, vessels, and piping for making pharmaceutical APIs and in food-grade equipment where metal contamination must be low.
Electrochemical: ERTi-2 is used for anodes in electrolytic processes (like chlor-alkali and metal electrowinning), in dimensionally stable anodes (DSA), and in cathodic protection systems.
Water Treatment: Used for membrane housing supports, UV disinfection chambers, and piping in municipal and industrial water treatment plants.

Storage and Handling of ERTi-2 Titanium Welding Wire

Store the wire in its original sealed packaging and reseal with desiccant after each use. Keep it in a clean, dry, climate-controlled area at 15–30°C with humidity below 60%. Store it away from ferrous materials and metals like copper, cadmium, zinc, and lead, and keep it out of carbon steel work areas. Before welding, clean the wire with acetone and handle it only with clean gloves. Use dedicated stainless steel brushes for titanium. Unopened TIG rods and MIG spools have an indefinite shelf life, and EN 10204 3.1 certificates must show full interstitial analysis.

Available Forms, Diameters and Packaging of ERTi-2 Welding Filler Wire

The table below shows the available forms, diameters, and packaging options for ERTi-2 welding filler wire used in TIG, MIG and automated welding.

Form	Diameters	Packaging
TIG Rod (GTAW)	1.0, 1.6, 2.0, 2.4, 3.2, 4.0 mm	5 kg sealed tubes, 914 or 1000 mm
MIG Spool (GMAW)	0.8, 0.9, 1.0, 1.2, 1.6 mm	5/10/15 kg vacuum-sealed (D200/D300)
Cut Lengths	0.5–6.0 mm	Custom for orbital/automated welding

How to Order ERTi-2 Titanium Welding Wire from Nicorex Alloys

Provide the details below to receive a quotation from Nicorex Alloys for ERTi-2 Titanium welding wire.

Product form: TIG Rod / MIG Spool
AWS classification: ERTi-2 per AWS A5.16
Diameter (mm or inches)
Quantity (in kg)
Rod length (914 mm or 1000 mm) or spool size (D200, D300)
Surface condition: polished or pickled
Required specifications: AWS A5.16, AMS 4941, ASTM B863, NORSOK M-001 (if offshore)
Test certificate: EN 10204 3.1 with FULL interstitial analysis (O, N, H, C, Fe)
Third-party approvals if required: DNV, ABS, Lloyds, Bureau Veritas, TUV
End application (heat exchanger/piping / offshore / desalination) for suitability confirmation
Delivery destination (domestic India / export)

Frequently Asked Questions

What is the price of ERTi-2 TIG rod per kg in India?

In India, ERTi-2 TIG rods usually cost INR 8,000–15,000 per kg, depending on size, order quantity and certifications. Contact Nicorex Alloys for exact current prices.

Why is ERTi-2 called the “workhorse” of titanium welding?

Its 345 MPa minimum tensile strength meets almost all CP titanium code requirements and still keeps the weld flexible. ERTi-1 is too weak; ERTi-3 and ERTi-4 are harder to weld.

Can ERTi-2 be used to weld grade 7 (Ti-0.2Pd) titanium?

Yes, but the weld won’t contain palladium, so crevice corrosion resistance at the joint decreases. Use ERTi-7 when you need full palladium protection through the weld.

What is the correct shielding gas for ERTi-2 titanium welding?

Use 100% argon at 99.995% (UHP) purity for both the main shielding gas and the back purge. Argon/helium mixes are allowed for MIG (GMAW).

What applications use the most ERTi-2 welding wire globally?

The main users of ERTi-2 are desalination plants, chemical plants with chloride and acid service, and power plants that use titanium condenser tubing in fossil and nuclear stations.

How is titanium weld quality assessed by colour inspection?

Titanium weld quality is judged by colour. Silver or bright is acceptable. Straw or light gold is borderline. Dark gold, purple, blue, or dark blue are rejected. Grey with white powder is severely contaminated and must be re-welded.

When should ERTi-2 not be used?

Do not use ERTi-2 for Grade 5 titanium, for severe reducing acids or critical crevice corrosion.