Best Tig Rod for Mild Steel (2026)
5 ER70S-6 TIG rods compared by diameter, length, weight, shielding gas and copper coating.
On this page
Top picks at a glance
As an Amazon Associate I earn from qualifying purchases.
- 1
Best OverallYESWELDER ER70S-69.7/10View on Amazon - 2
Best 1/16 in PickARCCAPTAIN ER70S-69.6/10View on Amazon - 3
Best in a CaseTOOLIOM ER70S-69.6/10View on Amazon - 4
Best Small PackBlulu ER70S-69.5/10View on Amazon
A mild steel repair in the shop starts with the right filler rod: the wrong diameter burns through thin sheet, and the wrong gas leaves a rough bead. The best tig rod for mild steel is a rod in the right diameter for the metal, with a shielding gas the listing states and a copper coating that resists rust. We compared the rods by diameter, length, weight, shielding gas and coating.
GarageToolHQ earns a commission when you buy through links on this page, at no extra cost to you. Read our affiliate disclosure.
Quick picks
- Best Overall YESWELDER ER70S-6: 1/8 in, 5 lb, copper coated, handles poor fit-up Check price on Amazon
- Best 1/16 in Pick ARCCAPTAIN ER70S-6: 1/16 in, 5 lb, stable arc, minimal spatter Check price on Amazon
- Best in a Case TOOLIOM ER70S-6: 1/16 in, 5 lb, packed in a plastic case Check price on Amazon
- Best Small Pack Blulu ER70S-6: 3/32 in, 2 lb, enough to share Check price on Amazon
Picks for the garage
YESWELDER TIG Welding Rod Mild Steel ER70S-6
A 1/8 in ER70S-6 copper coated rod, 16 in long, 5 lb, for mild steel with 100% argon shielding gas.
Pros
- 1/8 in, the thickest rod here
- Copper coated with the highest Mn and Si deoxidizers
- Permits higher welding currents with 100% argon
- Handles poor fit-up and rusty, oily plates
Cons
- No warranty term stated
- No safety certification stated
- 1/8 in is thick for thin sheet metal
- No case stated
ARCCAPTAIN Mild Steel TIG Welding Rod ER70S-6
A 1/16 in ER70S-6 rod, 16 in long, 5 lb, with C, Mn and Si alloying elements and 100% argon shielding gas.
Pros
- 1/16 in, 16 in, 5 lb, a full-size box
- C, Mn and Si alloying elements stated
- Stable arc with minimal spatter
- Fast deposition rate and well-formed welds
Cons
- No warranty term stated
- No safety certification stated
- No copper coating stated
- No case stated
TOOLIOM ER70S-6 Copper-Coated Mild Steel TIG
A 1/16 in ER70S-6 copper-coated rod, 16 in long, 5 lb, packed in a plastic case, for Ar and CO2 mixed gas or 100% CO2.
Pros
- Copper-coated to resist rust
- Packed in a plastic case
- Ar and CO2 mixed gas or 100% CO2
- Suitable for high welding currents with a stable arc
Cons
- No warranty term stated
- No safety certification stated
- No alloying elements stated
- No applications beyond vehicles, ships and bridges stated
Blulu Tig Filler Rod Er70s-6 Mild Steel Tig
A 3/32 in ER70S-6 rod, 16 in long, 2 lb, for mild and low-alloy steel with Ar and CO2 mixed gas or 100% CO2.
Pros
- 3/32 in, between the 1/16 in and 1/8 in rods
- Ar and CO2 mixed gas or 100% CO2
- Smooth weld bead without post-weld cleanup
- 2 lb pack, enough to share
Cons
- No warranty term stated
- No safety certification stated
- No copper coating stated
- No case stated
UNIFAMILY 1LB TIG Welding Rod ER70S-6
A 1 lb ER70S-6 rod pack with a copper plated surface, for mild and low-alloy steel with Ar and CO2 mixed gas or 100% CO2.
Pros
- Copper plated surface, less likely to rust
- Ar and CO2 mixed gas or 100% CO2
- Smooth welds with no need to clean the weld
- Suitable for high current welding with a stable arc
Cons
- Title says 3/32 in while the bullets say 1/16 in
- No warranty term stated
- No safety certification stated
- 1 lb pack, the smallest here
Compared on paper
| Model | Shop Score | Diameter | Length | Weight | Shielding gas | Warranty |
|---|---|---|---|---|---|---|
| YESWELDER ER70S-6 | 9.7/10 | 1/8 in | 16 in | 5 lb | 100% argon | Not stated |
| ARCCAPTAIN ER70S-6 | 9.6/10 | 1/16 in | 16 in | 5 lb | 100% argon | Not stated |
| TOOLIOM ER70S-6 | 9.6/10 | 1/16 in | 16 in | 5 lb | Ar & CO2 or 100% CO2 | Not stated |
| Blulu ER70S-6 | 9.5/10 | 3/32 in | 16 in | 2 lb | Ar & CO2 or 100% CO2 | Not stated |
| UNIFAMILY ER70S-6 | 9.5/10 | 3/32 in (bullets 1/16 in) | 16 in | 1 lb | Ar & CO2 or 100% CO2 | Not stated |
Specifications are manufacturer rated, collected 4 November 2026. All 5 rods are ER70S-6 for mild steel; the differences are diameter, weight and shielding gas.
How the points were given
Each rod is scored on performance, build, value, safety and warranty, using only what the listing publishes. Safety points go only to what the listing states: a stated certification or a stated safety feature. None of the 5 rods states a certification, so none earns safety points, and none states a warranty term, so none earns warranty points. The YESWELDER leads on diameter and deoxidizers, and the ARCCAPTAIN leads on stated alloying elements.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| YESWELDER ER70S-6 | 9.7 | 32 | 21 | 21 | n/a | 0 |
| ARCCAPTAIN ER70S-6 | 9.6 | 30 | 21 | 21 | n/a | 0 |
| TOOLIOM ER70S-6 | 9.6 | 29 | 20 | 21 | n/a | 0 |
| Blulu ER70S-6 | 9.5 | 27 | 19 | 20 | n/a | 0 |
| UNIFAMILY ER70S-6 | 9.5 | 26 | 19 | 20 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
What the TIG rod listings tell you
We read 5 ER70S-6 TIG rod listings for this guide. None states a warranty term, and none states a safety certification. 3 give a weight of 5 lb, 1 gives 2 lb and 1 gives 1 lb. 2 state 100% argon as the shielding gas, and 3 state Ar and CO2 mixed gas or 100% CO2. 1 listing disagrees with itself on diameter.
Buying guide: choosing the best tig rod for mild steel
Diameter
The rods here come in 3 diameters: 1/16 in (ARCCAPTAIN, TOOLIOM), 1/8 in (YESWELDER) and 3/32 in (Blulu, UNIFAMILY). The YESWELDER is the thickest rod here at 1/8 in, and its listing says the higher manganese and silicon deoxidizers permit higher welding currents. The UNIFAMILY listing disagrees with itself: the title and spec table say 3/32 in while the bullets say 1/16 in, so confirm the diameter before you buy.
Shielding gas
The ARCCAPTAIN and YESWELDER use 100% argon. The TOOLIOM, Blulu and UNIFAMILY can be welded with Ar and CO2 mixed gas or with 100% CO2 as the shielding gas. The YESWELDER listing says the greater the argon content of the shielding gas, the smoother the bead appearance with less spatter.
Copper coating
The YESWELDER is a copper coated carbon steel rod. The TOOLIOM is copper-coated to resist rust, and the UNIFAMILY has a copper plated surface that is less likely to rust. The ARCCAPTAIN and Blulu listings do not state a copper coating, so check the rod when it arrives if rust resistance matters to you.
Weight and pack
The ARCCAPTAIN, YESWELDER and TOOLIOM each come as a 5 lb box, the Blulu as 2 lbs and the UNIFAMILY as 1 lb. The TOOLIOM rods are packed in a plastic case, and the other listings state no case. All 5 rods are 16 in long.
Applications
ER70S-6 is for mild and low-alloy steel. The ARCCAPTAIN listing names machinery manufacturing, automobile manufacturing, bridge construction, building structures and pipeline welding. The YESWELDER, Blulu and UNIFAMILY listings name construction work, farm implements, tanks and truck bodies, and the TOOLIOM names vehicles, shipbuilding, bridges and automotive components.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
Garage Fit Check
- Storage: the TOOLIOM rods come packed in a plastic case; the other listings state no case.
- Stock: 5 lb boxes (ARCCAPTAIN, YESWELDER, TOOLIOM) cover more rod than the 2 lb Blulu or the 1 lb UNIFAMILY.
- Gas: 100% argon for the ARCCAPTAIN and YESWELDER; Ar and CO2 mixed gas or 100% CO2 for the TOOLIOM, Blulu and UNIFAMILY.
- Diameter: 1/16 in, 1/8 in and 3/32 in rods are listed here; check the diameter before you buy, since the UNIFAMILY listing gives two.
FAQ: garage tools
What is ER70S-6?
ER70S-6 is a gas-shielded copper-coated carbon steel welding rod for mild steel, per the YESWELDER listing. The ARCCAPTAIN listing says its main alloying elements are C, Mn and Si, with moderate carbon content for weld strength and manganese and silicon as deoxidizers.
What diameter TIG rod should I use for mild steel?
The rods here are 1/16 in, 1/8 in and 3/32 in, all 16 in long. The listings do not state which thickness of metal each diameter suits, so match the diameter to the metal you weld and check the listing before you buy.
What shielding gas does ER70S-6 need?
The ARCCAPTAIN and YESWELDER use 100% argon. The TOOLIOM, Blulu and UNIFAMILY can be welded with Ar and CO2 mixed gas or with 100% CO2 as the shielding gas.
Are these rods copper coated?
3 state it: the YESWELDER is copper coated, the TOOLIOM is copper-coated to resist rust, and the UNIFAMILY has a copper plated surface. The ARCCAPTAIN and Blulu listings do not state a copper coating.
Do any of these state a warranty?
No. None of the 5 rods states a warranty term in its listing, and none states a safety certification. The listings state diameter, length, weight, gas and coating, not warranty terms.
See the engine and shop equipment hub and the air tools picks.
