The Findmall ER70S-6 MIG welding wire is a 0.035-inch (0.9 mm) mild steel solid wire sold on a 33 lb spool, per the listing. ER70S-6 contains extra deoxidizers (manganese and silicon), so it tolerates light mill scale and surface rust better than ER70S-3. It needs shielding gas, so it suits shop and garage welding rather than windy outdoor work.
Verdict
Should you buy it? Yes, if you weld mild steel with a gas-shielded MIG welder that can hold a 33 lb spool and you go through wire regularly. Skip it if you weld occasionally or your machine only takes small spools.
- Best for: hobbyists with a high-use setup, farm and ranch repair, automotive and general fabrication in steel that is not perfectly clean.
- Not for: aluminum, stainless steel, or windy outdoor jobs without gas protection.
- Biggest pro: a large spool of ER70S-6 means fewer spool changes.
- Biggest con: needs shielding gas (CO2 or an argon/CO2 mix) and a welder that fits a large spool.
Key Takeaways
- 0.035-inch diameter is a common size for MIG welders in the 140 A to 250 A class; check your manual.
- 33 lb spool: confirm your machine accepts it before ordering.
- ER70S-6 classification means higher manganese and silicon than ER70S-3, which helps on slightly dirty steel.
- Works with CO2 or argon/CO2 shielding gas on mild steel.
Findmall ER70S-6 MIG Welding Wire Specifications
| Item | Detail |
|---|---|
| Classification | ER70S-6 (AWS A5.18 solid wire class) |
| Diameter | 0.035 inch (0.9 mm), per the listing |
| Spool | 33 lb, per the listing |
| Process | GMAW (MIG) with shielding gas |
| Base metal | Mild steel |
| Positions | All-position welding, per the listing |
The ER70S-6 class is defined in the AWS A5.18 specification. Deoxidizers in the wire help the weld pool handle light surface contamination, but you should still grind off heavy rust, paint and oil for strong welds.
Where This Wire Fits
ER70S-6 is a general-purpose wire for mild steel. Use CO2 or an argon/CO2 mix, and set wire speed and voltage from your welder chart for the material thickness. The listing describes low spatter and clean weld beads; results still depend on your settings, gas and surface prep.
- Automotive repair and custom fabrication
- Farm equipment maintenance
- General shop fabrication
- DIY steel projects
Checklist Before You Buy
- Spool size: 33 lb spools are large. Confirm your welder takes a spool this size, or plan to use an adapter that suits your machine.
- Wire size: your drive roller and contact tips must match 0.035 inch.
- Shielding gas: CO2 or argon/CO2 with a regulator and hose.
- Storage: keep the spool dry between uses.
Pros and Cons
Pros
- ER70S-6 handles lightly contaminated mild steel better than basic ER70S-3
- Large 33 lb spool means fewer changes
- Suits all-position gas-shielded welding
- Common 0.035-inch size
Cons
- Requires shielding gas, so it is not for windy outdoor work
- Not for aluminum or stainless steel
- A 33 lb spool is too much wire for occasional welders and does not fit every machine
- Copper-coated wire can leave residue in the liner, so clean or replace the liner periodically
Related guides: ER70S-6 MIG wire for auto body | 33 lb ER70S-6 MIG wire review | ER70S-6 MIG welding wire review
Frequently Asked Questions
What welding machine works best with ER70S-6 wire?
Any MIG welder that accepts 0.035-inch solid wire and has a drive roller sized for it will run this wire. A 33 lb spool is a large spool, so check that your machine has room for it, since many small welders only take 2 lb to 10 lb spools. Check the manual for the recommended wire size and settings.
Can this wire be used for aluminum or stainless steel?
No. ER70S-6 is a mild steel solid wire. Aluminum needs aluminum wire such as ER4043 or ER5356 and a different setup, and stainless steel needs a stainless wire such as ER308L, usually with different shielding gas.
Is this welding wire suitable for outdoor use?
Only with shielding gas that is protected from wind. Solid wire such as ER70S-6 relies on shielding gas, so drafts cause porosity. For windy outdoor jobs, self-shielded flux-cored wire is the usual choice.
How should the wire be stored to maintain quality?
Keep the spool in a cool, dry place, ideally sealed in its bag or a container. Moisture and rust on the wire can lead to feeding problems and porosity.
What safety gear is recommended while welding with it?
Use a welding helmet with the correct shade, welding gloves and flame-resistant clothing, and weld with ventilation. Follow the OSHA welding, cutting and brazing guidance for complete requirements.
Conclusion
The Findmall ER70S-6 MIG welding wire is a sensible choice for steady mild-steel welding when your machine fits a 33 lb spool and you use shielding gas. Check the current listing for spool details and price before you order.
