TIG Filler Rod — TIG Welding Rod & TIG Rod Selection Guide

Choose the right TIG filler rod — also called TIG rod or TIG welding rod — for every base metal: carbon steel ER70S-2, stainless ER308L through ER316L, aluminum ER4043 and ER5356, chrome-moly ER80S-D2 and ER4130, nickel alloys, titanium, and silicon bronze. WeldingMart stocks 608 TIG filler rods in diameters from .045 in. through 3/16 in., cut in standard 36 in. lengths and packaged in 1 lb and 10 lb tubes. With combined monthly search volume of 3,180 across "tig filler rod" (1,000/mo), "tig rod" (1,300/mo), and "tig welding rod" (880/mo) at KD 4–9, this is the least contested head-term cluster in the TIG supply category — and WeldingMart's deepest filler metal inventory makes this hub the definitive TIG rod destination.

Disambiguation note: This collection covers TIG filler rods (consumable filler metal) — the bare wire rods fed by hand into the weld puddle during GTAW. If you are shopping for the TIG welding machine (power source) that generates the arc, visit our dedicated TIG welders collection. The two product categories serve different functions in the TIG welding process and are maintained as separate, non-competing collections at WeldingMart.

What Is TIG Filler Rod? Overview for Buyers

A TIG filler rod (AWS term: GTAW filler metal) is a bare, uncoated wire rod that the welder feeds manually into the weld pool during Gas Tungsten Arc Welding. Unlike MIG wire, TIG filler rod is not electrode wire — it carries no current and is not connected to the welding machine. The arc is generated entirely by the non-consumable tungsten electrode; the filler rod is added separately to build up the joint.

TIG filler rod is classified by the American Welding Society (AWS) under the A5 filler metal standards:

• AWS A5.18 — Carbon and low-alloy steel TIG filler rod (ER70S-2, ER70S-6)
• AWS A5.9 — Stainless steel TIG filler rod (ER308L, ER309L, ER316L, ER347)
• AWS A5.10 — Aluminum TIG filler rod (ER4043, ER5356, ER4047)
• AWS A5.28 — Low-alloy steel TIG filler rod (ER80S-D2, ER90S-D2)
• AWS A5.30 / A5.14 — Nickel alloy and chrome-moly TIG filler rod (ERNiCr-3, ER4130, ER80S-B2)

All TIG filler rod AWS classifications follow the same ER prefix convention: E = electrode or rod, R = rod (suitable for manual feed). The numbers and letters following indicate the tensile strength, chemical composition, and alloy designation per AWS specifications.

TIG Filler Rod Buyer's Guide — How to Select TIG Rod by Base Metal

The primary rule of TIG filler rod selection: match the filler alloy to the base metal. The secondary rule: never over-match strength when welding heat-sensitive alloys. Use the base metal selection guide below to identify the correct AWS classification before selecting diameter and packaging.

Base Metal Compatibility Guide

TIG Rod Diameter Selection Guide

TIG filler rod diameter should generally be selected to match — or slightly undersize — the material thickness being welded. Over-large filler rod chills the weld puddle and introduces cold laps; under-sized rod is acceptable when making multiple passes on thick material.

TIG Rod Process Technology — Gas Shielding & AWS Classification Detail

Shielding Gas Requirements by TIG Filler Metal

The shielding gas used with TIG filler rod affects weld quality, bead appearance, and cost. Standard shielding gas for all TIG welding applications is 100% argon (Grade 4.5 minimum, 99.995% purity, CGA-580 cylinder connection). Deviations by alloy:

• Carbon and low-alloy steel TIG rod: 100% argon is standard. Argon/hydrogen blends (98%Ar/2%H₂) improve travel speed and bead appearance on austenitic stainless but are not acceptable on carbon steel (hydrogen embrittlement risk).
• Stainless steel TIG rod: 100% argon standard. 98%Ar/2%H₂ or tri-mix (Ar/He/H₂) improves penetration and surface finish on thin stainless sheet. Back purging with argon is required on tubing and pipe joints to prevent oxidation of the weld root.
• Aluminum TIG rod: 100% argon always. Argon/helium blends (75%Ar/25%He or 50/50) increase arc heat for thick aluminum (>3/8 in.) and improve fusion on high-thermal-conductivity alloys. Never use CO₂-containing mixed gases with aluminum TIG rod.
• Chrome-moly TIG rod: 100% argon with preheat (200–400°F depending on carbon equivalent). Post-weld heat treatment (PWHT) is required on most P91 and 4130 applications per AWS D10.8 and ASME code.
• Titanium TIG rod: 100% argon with trailing shield (cup extension) and back purge through weld completion and cool-down below 427°C (800°F). Oxygen contamination above this temperature produces gold/blue discoloration (acceptable) to gray/white scale (unacceptable per AWS D17.1).

AWS Filler Metal Classification System

All TIG welding rods at WeldingMart are classified per the current AWS A5-series specifications. Key classification examples:

• ER70S-2: E=electrode/rod, R=rod, 70=70,000 psi tensile strength, S=solid wire, 2=composition designation (triple-deoxidized: Ti, Zr, Al additions)
• ER308L: E=electrode/rod, R=rod, 308=chromium-nickel alloy (19Cr/10Ni), L=low carbon (<0.03%C)
• ER4043: E=electrode/rod, R=rod, 4043=aluminum-silicon alloy (4-6% Si addition)
• ER4130: E=electrode/rod, R=rod, 4130=chromium-molybdenum steel alloy (0.8-1.1% Cr, 0.15-0.25% Mo)

Full AWS A5-series filler metal classification standards are published by the American Welding Society (aws.org/standards). WeldingMart product listings include the AWS classification for every TIG filler rod in inventory.

TIG Welding Rod Applications by Industry

Carbon Steel TIG Rod (ER70S-2) — Structural & Fabrication

ER70S-2 is the most widely specified carbon steel TIG filler rod in North America. Used for all-position TIG welding of structural carbon steel (A36, 1018, A572) in pressure vessel fabrication, structural steel, automotive, and general manufacturing. Triple-deoxidized with titanium, zirconium, and aluminum additions — compatible with mill-scale and slightly contaminated base metal. Minimum 70,000 psi tensile strength per AWS A5.18. Available at WeldingMart in 1/16 in., 3/32 in., and 1/8 in. diameters in 1 lb and 10 lb packages.

Stainless Steel TIG Rod (ER308L, ER316L) — Food-Grade & Process

Stainless TIG welding rod is the core product in pharmaceutical, food processing, chemical handling, and architectural applications. ER308L (AWS A5.9) is the standard filler for 304/304L stainless — the most common austenitic grade in the food and beverage industry. ER316L adds molybdenum (2–3%) for improved resistance to chloride-induced pitting corrosion — required for seawater environments, pharmaceutical bioreactors, and chemical processing. Both grades are available in 1/16 in. and 3/32 in. diameters at WeldingMart.

Aluminum TIG Filler Rod (ER4043, ER5356) — Automotive & Marine

Aluminum TIG filler rod is the most technically nuanced selection in the TIG rod category — the wrong filler on aluminum results in hot cracking, poor bead flow, or anodizing color mismatch. ER4043 (AWS A5.10) is the general-purpose aluminum TIG rod for 6xxx series alloys (6061, 6063) — silicon addition (4–6% Si) provides excellent fluidity and reduces hot cracking sensitivity. ER5356 (AWS A5.10) is the high-strength alternative for 5xxx series aluminum (5052, 5086, 5083) and provides better color match for post-weld anodizing. Do not use ER5356 on 2xxx or 7xxx series aluminum — hot cracking risk is severe. Consult AWS A5.10 Table 4 for the complete filler metal selection chart for aluminum alloys.

Chrome-Moly TIG Rod (ER80S-D2, ER4130) — Power Generation & Motorsports

Chrome-moly TIG rod covers two distinct market applications. In motorsports and custom fabrication, ER4130 is the standard TIG welding rod for chromoly tube (4130 N, DOM tube) in roll cages, race car chassis, and bicycle frames — providing matching alloy composition and the characteristic fine-grain structure that anneals cleanly after post-weld stress relief. In power generation and pressure vessels, ER80S-D2 (AWS A5.28) is used for P91 and Cr-Mo pipe welding under ASME Section I and Section VIII — always with preheat and mandatory PWHT per the applicable code case.

Specialty TIG Rod — Titanium, Nickel, Silicon Bronze

WeldingMart's specialty TIG rod inventory covers aerospace-grade titanium filler (ERTi-2, ERTi-7), nickel alloy filler (ERNiCrMo-3 for Inconel 625 and alloy 625 applications), and silicon bronze (ERCuSi-A) for dissimilar metal brazing and copper alloy joining. These specialty filler metals are sold by the piece and in small-quantity tubes — appropriate for the low-volume, high-precision applications they serve.

TIG Filler Rod Specifications — Diameter, Packaging & Cut Length

All WeldingMart TIG filler rods are cut to 36 in. (914 mm) lengths, consistent with AWS A5 series and industry-standard cut length. Tubes are sealed at both ends for storage. 10 lb tubes are the production purchase quantity — most production welding shops order by the 10 lb tube for the alloys they run continuously.

Top TIG Filler Rod Brands at WeldingMart

Lincoln Electric

Lincoln Electric's TIG filler rod line (SuperArc, JM, and specialty series) covers the full AWS A5 classification range. Lincoln's ER70S-2 and ER308L TIG rods are manufactured in their Cleveland, Ohio facility and are produced to tight AWS chemical composition tolerance bands — critical for procedure qualification work where chemistry certification is required. Lincoln Electric TIG filler rod certificates of conformance are available for every lot shipped.

Hobart

Hobart filler metals provide professional-grade TIG rod at accessible price points. Hobart's ER70S-2, ER308L, ER4043, and ER5356 are the most popular alloys in the Hobart TIG rod lineup carried at WeldingMart — reliable for general fabrication, structural work, and production shops where per-pound cost matters and lot traceability requirements are standard AISC/AWS commercial grade.

Harris Products Group

Harris Products Group specialty TIG filler rod covers the silicon bronze (ERCuSi-A), phosphor bronze, and specialty non-ferrous alloys used in HVAC copper brazing, marine bronze repair, and dissimilar metal joining. Harris filler metals are manufactured under ISO 9001 quality management and are classified per AWS A5.7 (copper alloy filler metals).

MK Products

MK Products supplies specialty TIG wire spools and precision filler materials for orbital and automated GTAW applications — including orbital pipe welding systems used in semiconductor fab, pharmaceutical, and food-grade tubing installation. Their precision wire sizing (±0.0005 in. diameter tolerance) is required by orbital welding heads for consistent automatic wire feed performance.

TIG Filler Rod FAQ

What is TIG filler rod?

TIG filler rod (also called TIG rod or TIG welding rod) is a bare, uncoated wire rod fed manually into the weld pool during Gas Tungsten Arc Welding (GTAW/TIG). It is classified per AWS A5-series standards by alloy and tensile properties, cut to 36 in. lengths, and packaged in 1 lb and 10 lb tubes. TIG filler rod is a consumable filler metal — not to be confused with the non-consumable tungsten electrode that generates the arc, or with the TIG welding machine (power source) that drives the process. For TIG welding machines, visit our separate TIG welders collection.

What TIG rod should I use for aluminum?

For 6061 and 6063 aluminum (the most common structural aluminum alloys), use ER4043 — it provides good fluidity, low hot-cracking sensitivity, and is the general-purpose standard per AWS A5.10. For 5052, 5086, and 5083 marine-grade aluminum, use ER5356 for higher strength and better anodizing color match. Never use ER5356 on 2xxx or 7xxx series aluminum — consult AWS A5.10 Table 4 for the full compatibility chart.

What is the difference between ER308L and ER316L TIG rod?

ER308L is the standard TIG filler rod for 304 and 304L stainless steel. It contains approximately 19% chromium and 10% nickel with low carbon (<0.03%) to prevent sensitization. ER316L adds 2–3% molybdenum to improve pitting corrosion resistance — required when welding 316/316L stainless in seawater environments, pharmaceutical reactors, or chemical processing equipment where chloride pitting is a failure mode. Use ER308L for general 304 stainless work; use ER316L when the application calls for 316 stainless.

What is the difference between tig rod and tig welding rod?

"TIG rod," "TIG filler rod," and "TIG welding rod" are all industry-common names for the same product — the bare wire filler metal used in Gas Tungsten Arc Welding. The formal AWS terminology is "GTAW filler metal" or "TIG welding wire." At WeldingMart, all three terms refer to the same product category covered in this collection. This is distinct from the WeldingMart TIG welders collection, which covers TIG welding machines (power sources).

What diameter TIG rod do I need?

The general guideline is to select a TIG rod diameter approximately equal to or slightly smaller than the material thickness. For most light fabrication (1/8 in. and under), 3/32 in. diameter is the most versatile choice — it works across a wide amperage range (70–175A) and covers most steel, stainless, and aluminum TIG applications. For thin sheet (18–22 gauge), step down to 1/16 in. For heavy plate and multi-pass welds on material over 3/8 in., 1/8 in. rod is appropriate.

How should I store TIG filler rod?

Store TIG filler rod in the sealed tube in a dry, climate-controlled environment. Carbon steel and low-alloy TIG rods (ER70S-2, ER80S-D2) are susceptible to surface oxidation if stored in high-humidity environments — always reseal the tube after opening. Stainless and nickel alloy TIG rods are more corrosion-resistant but should also be kept sealed to prevent surface contamination. Aluminum TIG rod (ER4043, ER5356) is particularly sensitive to surface oxide formation — inspect for whitish surface oxidation before use and discard rods with heavy oxidation, as they will contaminate the weld.

Do I need to preheat when using chrome-moly TIG rod?

Yes — most chrome-moly TIG applications require preheat. For 4130 chromoly steel tube/plate (motorsports, general fabrication), preheat to 200–300°F (93–149°C) minimum and allow controlled slow cooling. For P91 (9Cr-1Mo) and Cr-Mo pressure vessel applications, preheat of 400°F+ and mandatory post-weld heat treatment (PWHT) are required per ASME Section I, Section VIII, and applicable ASME Code Cases. Consult your welding procedure specification (WPS) for the specific preheat and interpass temperature limits applicable to your joint.

What is the difference between ER70S-2 and ER70S-6 TIG rod?

Both are carbon steel TIG filler rods classified under AWS A5.18 with the same 70,000 psi minimum tensile strength. ER70S-2 is triple-deoxidized (titanium, zirconium, and aluminum additions) — the highest-quality carbon steel TIG rod for radiographic-quality welds on clean base metal. It's the specification choice for pressure vessel, structural, and pipe root pass work. ER70S-6 has higher silicon and manganese content — better for base metals with mill scale or light surface contamination, and it produces a flatter, wider bead profile. For code-quality TIG work on clean steel, specify ER70S-2. For general shop fabrication, ER70S-6 is acceptable.

Can I use TIG rod for MIG welding or sub-arc?

No. TIG filler rod (cut lengths, 36 in., 1 lb tubes) is not compatible with MIG wire feeders or sub-arc wire delivery systems, which require continuous wire spooled on plastic reels. The products are manufactured to different tolerances and package forms. TIG rod is cut, packaged by the pound in tubes, and designed for manual feed. MIG wire and sub-arc wire are spooled in continuous lengths on reels from 2 lb to 500+ lb. Do not attempt to use TIG cut lengths in a wire feeder — the joints between pieces will jam the liner.

What AWS standard covers TIG filler rod classification?

TIG filler rods are classified under the AWS A5 filler metal series: AWS A5.18 (carbon steel GTAW), AWS A5.9 (stainless steel), AWS A5.10 (aluminum), AWS A5.28 (low-alloy steel), AWS A5.14 (nickel alloys), and AWS A5.16 (titanium). All WeldingMart TIG filler rods carry the full AWS classification designation on the product label and tube, with optional Certificate of Conformance (C of C) available for lot-traceable orders.