ER70S-2 TIG Rod

COREWELD 70S2 is a copper-coated ER70S-2 TIG Rod supplied for manual and automated GTAW on carbon steel. The rod carries the AWS A5.18 classification ER70S-2, a triple oxidised carbon steel filler containing aluminium, titanium and zirconium, as well as manganese and silicon. Welders apply it to root runs on small-bore pipe, sheet metal joints and mild steel repair work.

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ER70S-2 TIG Rod Specifications

COREWELD 70S2 carries the AWS A5.18/A5.18M classification ER70S-2 and suits the GTAW process. The product form is a straight-cut filler rod in carbon steel. ASME SFA-5.18 mirrors the classification for code work, so the rod meets ASME Section IX requirements where the qualified WPS permits it. Take rod diameter, cut length and packaging from the COREWELD 70S2 datasheet.

Specification	Details
Brand	COREWELD
Product Designation	COREWELD 70S2
AWS Classification	ER70S-2
Welding Process	TIG / GTAW
Product Form	Filler rod
Material Type	Carbon steel
Available Diameters	1/16 in, 3/32 in, 1/8 in (1.6 mm, 2.4 mm, 3.2 mm)
Rod Length	36 in (914 mm)
Applicable Standard	AWS A5.18/A5.18M; ASME SFA-5.18
Packaging	10 lb (or 5 lb) plastic tube / cardboard box

Chemical Composition of ER70S-2 TIG Rod

Composition specifies how the deposited weld metal behaves. Strength, toughness and oxide tolerance trace back to the alloying and deoxidising elements in the rod. Aluminium, titanium and zirconium are the three deoxidizers that define this classification. The limits below are the AWS A5.18 requirements for ER70S-2. Heat chemistry for a delivered batch appears on its mill test certificate.

Element	Composition (%)
Carbon (C)	0.07 max
Manganese (Mn)	0.90 to 1.40
Silicon (Si)	0.40 to 0.70
Phosphorus (P)	0.025 max
Sulphur (S)	0.035 max
Aluminium (Al)	0.05 to 0.15
Titanium (Ti)	0.05 to 0.15
Zirconium (Zr)	0.02 to 0.12

Mechanical Properties of ER70S-2 Weld Metal

Four properties decide whether an ER70S-2 deposit meets the job: tensile strength, yield strength, elongation and notch toughness. AWS A5.18 sets minimums for weld metal produced with 100% argon shielding based on a formal electrode negative. Production joints often exceed them, though the margin shifts with heat input, travel speed and joint condition. Testing under the qualified procedure confirms what a weld achieves.

Property	Typical Requirement / Value
Tensile Strength	480 MPa (70 ksi) minimum
Yield Strength	400 MPa (58 ksi) minimum
Elongation	22% minimum
Impact Properties	27 J at -29°C (20 ft-lbf at -20°F) minimum

Key Features of COREWELD 70S2 TIG Filler Rod

Five characteristics define how this rod functions at the torch and where it fits into a carbon steel procedure.

AWS ER70S-2 classification: Manufacture follows AWS A5.18, and the classification appears on the label and test certificate.
Triple deoxidation: Aluminium, titanium and zirconium, along with manganese and silicon, tie up oxygen in the weld pool.
Carbon steel compatibility: The rod matches mild steel and carbon-manganese steels with a 70 ksi class weld metal.
Light oxide tolerance: Where the WPS allows it, the deoxidiser package handles residual scale that promotes porosity.
Diameter choice: COREWELD lists the supplied diameters on the datasheet; confirm before ordering.

ER70S-2 Filler Rod Applications

Root pass welding on small-bore carbon steel pipe
Tube and tubular structure fabrication
Sheet metal and thin-gauge plate joints
Boiler and pressure part welding
Repair welding on mild and low-alloy steel
Automotive and general engineering fabrication
Structural steelwork in the 70 ksi class

Manufacturing Process of ER70S-2 Filler Rod

Material selection: Mills choose billets against the AWS A5.18 carbon, manganese and silicon limits.
Alloying and melting: Controlled additions of aluminium, titanium and zirconium create triple deoxidised chemistry.
Forming processes: Hot rolling, drawing and straightening bring the rod to its final diameter and length.
Composite filler metal production: Copper coating, cleaning and marking finish the rod before packing.

Benefits of Using ER70S-2 Filler Rod

Two things give this classification its value: rod chemistry and the control the TIG process gives the welder.

TIG welding of compatible carbon steel grades is possible across all welding positions.
A deoxidiser package that lowers the risk on surfaces carrying light oxide.
Fabrication and repair work where the procedure requires 70 ksi class weld metal.
Controlled deposition, because the welder feeds the rod independently of the arc.
A recognised AWS classification that simplifies procedure planning and purchasing.

Joint preparation, shielding gas, current settings, base-metal condition and operator technique shape the outcome.

How to Select the Right ER70S-2 TIG Rod

Selection starts with the base metal and ends with the qualified procedure. Five checks cover the ground.

Confirm the base-metal grade and the weld metal properties the design demands.
Match the ER70S2 filler Rod diameter to material thickness and joint design, keeping to the datasheet sizes.
Check the AWS classification named in the project specification.
Follow the qualified WPS for current, polarity, shielding gas and flow rate.
Confirm that an ER70S-2 TIG Rod suits the service conditions and any contractual testing.

Why Choose COREWELD 70S2?

Metracore manufactures and supplies ER70S-2. COREWELD 70S2 is identified by the AWS ER70S-2 classification, a fixed reference point for comparing filler metal against a project specification. Technical documentation covering composition limits, mechanical requirements and dimensional data follows once confirmed against the current datasheet. Buyers unsure which diameter suits a wall thickness can ask for guidance before ordering. Selection support based on base-metal grade and welding procedure is available on enquiry.

Ordering and Technical Support

Send your enquiry with the rod diameter, cut length, packaging format, order quantity and delivery location. Adding the initial metal grade and the welding procedure helps confirm whether this ER70S-2 welding rod suits the joint.

Request a quotation for COREWELD 70S2 with your diameter and quantity details.

Frequently Asked Questions About ER70S-2 TIG Rod

What is an ER70S-2 TIG rod?

An ER70S-2 TIG rod is a triple deoxidised carbon steel filler rod classified under AWS A5.18 for GTAW. Aluminium, titanium and zirconium form its deoxidiser package.

What is the difference between ER70S-2 and other ER70S filler rods?

ER70S-2 carries aluminium, titanium and zirconium as deoxidizers, while ER70S-6 depends on higher manganese and silicon. The difference is evident in puddle fluidity and oxide tolerance.

What materials can ER70S-2 filler rod be used to weld?

ER70S-2 welds mild steel, carbon steel, and carbon-manganese steels in pipe, tube, sheet and plate form. Match it with base metals in the 70 ksi class.

Is ER70S-2 suitable for TIG welding carbon steel pipes?

Yes, root pass welding on small-bore carbon steel pipe is an established use, run with 100% argon shielding and DCEN polarity under a qualified procedure.

What diameters are available for COREWELD 70S2?

Diameter availability is shown on the COREWELD 70S2 datasheet. Confirm the sizes and cut lengths with the supplier before ordering, as stocked ranges differ between manufacturers.

How should ER70S-2 welding rods be stored and handled?

Store the rods dry, indoors and at stable room temperature in the original sealed tube or carton. Handle with clean gloves, because oil and moisture cause porosity.