Blue Demon ER70S-6 Welding Wire Review
By SellySell Editorial Team · Last updated: June 6, 2026
The Blue Demon ER70S-6 Welding Wire is made for MIG/GMAW welding on mild steel. It is often chosen because ER70S-6 wire has higher manganese and silicon content than some basic mild steel wires. That helps the wire handle light surface scale and small amounts of contamination better during welding.
This review covers the .035-inch Blue Demon ER70S-6 wire linked in this article. It explains the key features, best use cases, limits, pros, cons, and buyer questions in simple language. Always check the current Amazon page, welder manual, and wire label before buying because spool size and listing details can change.
Quick Verdict
Best for: MIG welders who need .035-inch ER70S-6 mild steel wire for general repair, fabrication, and shop projects.
Skip it if: You need aluminum wire, flux-core wire, stainless wire, or a wire size not supported by your welder.
Bottom line: Blue Demon ER70S-6 is a practical choice for clean and lightly imperfect mild steel when your machine supports .035-inch solid MIG wire and shielding gas.
Key Specifications
| Specification | Detail |
|---|---|
| Brand | Blue Demon |
| Wire Type | ER70S-6 solid MIG welding wire |
| Wire Diameter | .035 inch |
| Material Use | Mild steel and carbon steel applications |
| Welding Process | MIG / GMAW with shielding gas |
| ASIN | B0CMDWVFWX |
| Main Buyer Check | Confirm spool size, machine compatibility, and shielding gas before purchase |
What Is This Product?
Blue Demon ER70S-6 is a solid welding wire for MIG welding mild steel. The ER70S-6 classification is commonly used for general steel welding because it supports strong weld deposits when used with the correct gas, settings, and base metal prep.
The article link points to ASIN B0CMDWVFWX. The product name and link suggest a Blue Demon ER70S-6 wire in .035-inch diameter. Before you order, confirm the spool size and wire diameter on the Amazon page because MIG machines do not all accept the same spool format.
Who It Is For
This wire is a good fit for welders who already use solid MIG wire with shielding gas. It can suit home garages, repair work, farm tasks, metal fabrication, and light shop jobs when .035-inch wire is the right size for the machine and material thickness.
It is also useful if you weld steel that is not perfectly clean. ER70S-6 wire is known for better tolerance of light mill scale and minor surface issues than some lower-silicon wires. Still, you should clean the base metal as much as possible for stronger welds.
Who Should Skip It
Skip this wire if you need flux-core welding without shielding gas. ER70S-6 is a solid wire, so it normally needs the correct shielding gas to protect the weld puddle.
You should also skip it if your welder does not support .035-inch solid wire. Check your drive rolls, contact tips, liner, and machine settings before buying. It is not the right choice for aluminum or stainless steel projects.
Key Takeaways
- Blue Demon ER70S-6 is a solid MIG welding wire for mild steel and carbon steel work.
- The .035-inch diameter fits many MIG/GMAW machines, but you must confirm your machine setup first.
- Higher manganese and silicon content can help improve weld puddle flow and handle light surface contamination.
- It is not a flux-core wire and should be used with suitable shielding gas.
- It is not meant for aluminum, stainless steel, or machines that cannot feed .035-inch wire.
Quality and Composition of Blue Demon ER70S-6
The main strength of ER70S-6 wire is its composition. It uses manganese and silicon as deoxidizers. In simple terms, these elements help the weld puddle deal with small amounts of oxygen and surface contamination during welding.
That does not mean you can weld over heavy rust, paint, oil, or dirt without prep. Dirty metal can still cause porosity, weak fusion, and poor bead shape. Clean the surface first, then use the wire within the settings recommended by your welder and the wire label.
For many users, ER70S-6 is a practical everyday wire. It can produce smooth beads on mild steel when the gas flow, voltage, wire speed, stickout, and travel angle are set correctly.
Performance and Versatility
The Blue Demon ER70S-6 wire is designed for MIG/GMAW welding. It can be used in different welding positions when your settings and technique match the job. Flat and horizontal welds are usually easier for beginners. Vertical and overhead work need more control.
The .035-inch size can be useful for many steel repair and fabrication jobs. It is often used on medium-thickness steel, but the correct range depends on your machine, shielding gas, joint type, and material thickness.
ER70S-6 wire can help produce clean, strong welds on mild steel when the base metal is prepared and the machine is set correctly.
If you often weld thin sheet metal, check whether your machine and project are better suited for a smaller wire size. If you weld thicker steel, confirm that your welder has enough output for the job.
Finish and Appearance
Good MIG wire should feed smoothly and support a stable arc. A clean, consistent wire surface can help reduce feeding problems when the liner, drive rolls, and contact tip are also in good shape.
Blue Demon ER70S-6 can produce neat-looking welds with low spatter when used with the right shielding gas and settings. Poor setup can still cause spatter, porosity, burn-through, or uneven beads.
For better results, keep the wire dry and protected from dust. Do not leave the spool exposed in a damp shop. Rust or dirt on the wire can hurt feeding and weld quality.
Real-World Use
This wire makes sense for general mild steel jobs. You may use it for brackets, frames, repairs, shop fixtures, small fabrication tasks, and basic automotive steel work where MIG welding is suitable.
For outdoor welding, take extra care. Wind can blow away shielding gas and leave the weld exposed. If you must weld outside, use wind protection and check the weld closely. For windy jobs without shielding gas, a flux-core wire may be a better choice.
For rusty or painted steel, remove as much contamination as possible before welding. ER70S-6 can handle light surface issues better than some wire types, but it is not a replacement for proper prep.
Pros and Cons
Pros
- ER70S-6 composition is well suited for many mild steel MIG welding jobs
- .035-inch diameter works with many MIG machines when set up correctly
- Higher manganese and silicon content can help with puddle flow and light surface contamination
- Useful for repair, fabrication, garage, and shop projects
Cons
- Requires suitable shielding gas because it is solid MIG wire
- Not suitable for aluminum, stainless steel, or flux-core-only welding setups
- Spool size and machine compatibility must be checked before buying
Is It Worth the Price?
Blue Demon ER70S-6 is worth considering if you need a solid mild steel MIG wire in .035-inch diameter. It offers a common wire classification, a known welding brand, and a practical setup for many steel projects.
The value depends on your welder and your work. If your machine feeds .035-inch solid wire well, this wire can be a useful shop supply. If your welder needs a different wire size or spool type, choose the correct version instead.
Alternatives to Consider
If you want to compare similar products, look at other ER70S-6 solid MIG wires from brands such as Lincoln Electric, Hobart, and Forney. These options are useful for context only. Match the wire diameter, spool size, and material type to your welder before choosing.
If you need to weld without shielding gas, compare flux-core wires instead. If you need to weld stainless steel or aluminum, choose wire made for that material and confirm your welder setup supports it.
Frequently Asked Questions
What Is Blue Demon ER70S-6 Used For?
Blue Demon ER70S-6 is used for MIG welding mild steel and carbon steel. It is suitable for many repair, fabrication, and shop projects when used with the right machine settings and shielding gas.
Does ER70S-6 Need Shielding Gas?
Yes. ER70S-6 is solid MIG wire, so it normally needs shielding gas. Without proper gas coverage, the weld can develop porosity and weak spots.
Can Blue Demon ER70S-6 Be Used With a Spool Gun?
It may work with some spool guns if the gun supports .035-inch solid steel wire and the correct spool format. Check your spool gun manual before using it.
Is ER70S-6 Good for Rusty Steel?
ER70S-6 can handle light surface contamination better than some mild steel wires. Still, you should remove rust, paint, oil, and dirt before welding for the best result.
Is ER70S-6 Suitable for Outdoor Welding?
It can be used outdoors only if you protect the shielding gas from wind. Wind can remove the gas shield and cause porosity. For windy outdoor work, flux-core wire may be a better option.
What Safety Gear Do You Need for ER70S-6?
Use a welding helmet, gloves, flame-resistant clothing, eye protection, and proper ventilation. Follow your welder manual and local safety rules. Welding fumes, arc light, sparks, and hot metal can cause serious injury.
Final Verdict
The Blue Demon ER70S-6 Welding Wire is a solid choice for mild steel MIG welding if your machine supports .035-inch wire. Its ER70S-6 composition makes it useful for many repair and fabrication jobs, especially when the steel has light surface scale after proper cleaning.
Buy it if you need solid MIG wire for steel and already have the right shielding gas, drive rolls, contact tips, and welder settings. Skip it if you need flux-core wire, aluminum wire, stainless wire, or a different diameter.
