Premium quality solid, flux-cored, and alloy wire formulations optimized for robotic fabrication and manual welding pipelines.
Understanding the chemical nuances, mechanical properties, and compliance standards for heavy industrial welding projects.
In global structural steel fabrication and automatic line assembly, SG2 MIG wire (EN ISO 14341-A G 3Si1) and its American counterpart AWS A5.18 ER70S-6 serve as the baseline consumables. While frequently cross-referenced and substituted, a true understanding of their specific metallurgical profile is essential for high-performance fabrication, pressure vessels, and robotic setups that require exact mechanical property yields.
Both specifications classify solid carbon steel wires formulated to deposit high-quality welds under shielding gas configurations (typically CO2 or Argon/CO2 mixes). However, SG2 and ER70S-6 place strict tolerances on deoxidizing elements: Silicon (Si) and Manganese (Mn). These deoxidizers actively draw out impurities and oxygen from the molten weld pool, transforming them into a superficial silicate slag that is easily brushed away, preventing internal porosity and hot cracking.
| Standard / Grade | C (%) | Si (%) | Mn (%) | P (%) Max | S (%) Max | Tensile Strength | Yield Strength |
|---|---|---|---|---|---|---|---|
| SG2 (EN ISO 14341-A G 3Si1) | 0.06 - 0.14 | 0.70 - 1.00 | 1.30 - 1.60 | 0.025 | 0.025 | 500 - 640 MPa | ≥ 420 MPa |
| ER70S-6 (AWS A5.18) | 0.06 - 0.15 | 0.80 - 1.15 | 1.40 - 1.85 | 0.025 | 0.035 | ≥ 480 MPa | ≥ 400 MPa |
| Yuxin Quality Standard | 0.08 - 0.11 | 0.85 - 0.95 | 1.45 - 1.55 | ≤ 0.015 | ≤ 0.015 | 540 - 580 MPa | ≥ 440 MPa |
Higher silicon and manganese concentrations in the wire composition absorb rust, mill scale, and light surface oils on base steels. This dramatically reduces weld rejects and ensures high radiographic inspection pass rates in automated heavy manufacturing environments.
Our micro-thin, highly uniform copper coating layer provides optimal electrical contact, reduces feed friction, and resists oxidation during storage. It prevents copper flaking, which can clog liners and contact tips, leading to arc instability.
Yuxin SG2 MIG Wire achieves exceptional Charpy V-notch impact values down to -30°C (≥ 47 J), fulfilling requirements for offshore marine structures, high-altitude structural building codes, and cryogenic engineering applications.
Pioneering Excellence in Welding Solutions Since 2004
Established in Wulian, Rizhao City, Shandong Province, Wulian Yuxin Hardware Equipment Co., Ltd. has grown from a locally excellent manufacturer to a globally recognized producer of premium welding consumables. With our own 15,000-square-meter production facility and advanced manufacturing equipment, we proudly maintain complete control over our production processes, ensuring consistent quality across our entire product range.
Our core operational philosophy centers on precision engineering and structural integrity. By operating advanced wire-drawing machinery, automated chemical cleaning basins, and precision copper electroplating lines, we manufacture SG2 MIG wire and other structural consumables that run smoothly under tough conditions. Our engineering department continually monitors raw rod batches to guarantee batch-to-batch chemical uniformity.
Providing reliable bulk supplies, consistent product properties, and flexible logistics to international markets.
Our annual production capacity of 3,000 tons allows us to reliably serve clients across five continents, with particular strength in European and Southeast Asian markets. All products meet stringent international standards, including ISO9001 and CE certifications, and undergo rigorous quality control at every production stage. With automated packaging machines, precision coil layering, and vacuum-sealed anti-moisture wrapping, we ensure your order arrives in optimal condition, ready for the wire feeder.
Understanding the cost structures, supply chain integration, and manufacturing scale of Chinese factories.
Located in Shandong Province, our facility benefits from access to China's premier raw steel producers. This geographical proximity reduces raw material transport costs and gives us access to top-grade ER70S-6/SG2 wire rods with tight tolerances on chemical elements like phosphorus and sulfur.
From mechanical descaling to precision wire drawing, continuous electro-plating, layer winding, and automated packaging, our processes are integrated in-house. Minimizing outsourcing allows us to control costs and maintain strict quality standards.
Our drawing machines use multi-stage dies to gradually reduce wire diameters. This method minimizes internal stresses in the steel, yielding a finished wire with consistent tensile strength and dependable feeding characteristics.
We specialize in manufacturing: MIG Welding Wires (ER70S-6), Flux-Cored Wires (E71T-1C), Stainless Steel Welding Wires (ER308L/ER316L), and Welding Electrodes (E6013/E7018).
What makes Wulian Yuxin a trusted OEM partner for distributors and tier-one construction networks worldwide.
All products meet stringent international standards, including ISO9001 and CE certifications, and undergo rigorous quality control at every production stage.
Today, our products are trusted by industrial clients in over 20 countries worldwide, with a strong presence across key European and Southeast Asian hubs.
Our in-house R&D team continuously improves product formulations, while our QC department maintains tolerances 30% stricter than industry standards.
We remain committed to our founding principles of integrity, innovation, and customer focus - values that have guided us through nearly two decades of sustainable growth.
Witness our global engagement and standard compliance in action across international trade fairs and industrial sites.
Our welding wires are engineered to perform in challenging, high-stress fabrication environments.
Used by European automotive component manufacturers, our ER70S-6 SG2 MIG wire provides high arc stability and minimal spatter. This optimization supports automated robotic arms running continuous multi-shift schedules, reducing post-weld cleanup costs.
Applied in heavy shipbuilding and structural infrastructure construction in Southeast Asia. This formulation handles out-of-position welding and windy outdoor environments where shielding gas coverage can be compromised.
Applied in food processing equipment and chemical manufacturing facilities. Provides excellent corrosion resistance and weld-pool fluidity, satisfying tight sanitation standards.
Used for root pass pipe welding in petrochemical refineries. Provides a dense, slag-free, high-purity weld structure that passes radiography tests under high pressure.
Used in outdoor bridge construction and general structural repairs. Provides stable arc starting, low spatter, and easy slag removal under varied weather conditions.
Today, our products are trusted by industrial clients in over 20 countries worldwide. From major construction projects in Germany to manufacturing plants in Vietnam, our welding solutions form invisible bonds that hold critical infrastructure together. Our export markets include:
For procurement directors ordering in bulk from China:
Stricter standards for consistent, high-strength industrial welds.
What sets Wulian Yuxin apart is our unwavering commitment to quality. Our in-house R&D team continuously improves product formulations, while our QC department maintains tolerances 30% stricter than industry standards. This dedication has earned us long-term partnerships with dozens of Fortune 500 suppliers and distributors.
Every spool of SG2 MIG welding wire undergoes visual, physical, and chemical verification. We inspect the wire surface for consistency, test raw wire tensile strength, and run test arcs under various gas mixtures to confirm performance before shipping.
Our 15,000-square-meter facility houses advanced drawing and automated spooling lines, maintaining strict batch consistency.
As we look ahead, we're investing in: automated production lines to increase capacity by 40%, eco-friendly packaging solutions, enhanced technical support services, and expanded product testing facilities. We remain committed to our founding principles of integrity, innovation, and customer focus - values that have guided us through nearly two decades of sustainable growth.
Find expert answers to common questions about metallurgy, sourcing, and applying SG2 MIG welding wire.
While often used interchangeably, the European SG2 designation (under standard EN ISO 14341-A G 3Si1) and the American ER70S-6 standard (AWS A5.18) differ slightly in chemistry limits. ER70S-6 allows a marginally wider range of Silicon (0.80% - 1.15%) and Manganese (1.40% - 1.85%) compared to SG2 (Si: 0.70% - 1.00%, Mn: 1.30% - 1.60%). These deoxidizers help reduce porosity when welding over light surface contamination. In practice, most high-quality wire brands formulate their products to satisfy the chemical requirements of both specifications simultaneously.
A consistent, uniform copper coating is crucial. If the copper layer is too thick or poorly bonded, it can peel or flake under pressure from the wire feed rollers. These flakes collect in the liner, eventually clogging the torch, causing wire slippage, arc instability, and accelerating contact tip wear. Wulian Yuxin uses a chemical cleaning and plating process to apply a thin, durable copper coating that ensures consistent electrical contact with minimal flaking.
SG2 MIG welding wire is highly versatile. For carbon steels, common gas setups include:
Welding wire must be stored in dry, temperature-controlled warehouses with relative humidity levels below 60%. Spools should be kept off the floor on pallets in their original, unopened packaging. Avoid sudden temperature changes that can cause condensation on the wire surface, which leads to rust and risk of hydrogen cracking in finished welds. Our spools are shipped with silica gel desiccants and wrapped in vacuum-sealed plastic wrap to protect them during transit and storage.
Our SG2 wire formulations are engineered to deposit weld metal that meets or exceeds standard industrial requirements. Typical properties using an Ar/CO2 mixed shielding gas include: Yield strength ≥ 420 MPa, Tensile strength between 500 and 640 MPa, Elongation ≥ 22%, and Impact energy absorption value ≥ 47 Joules at -30°C. These properties make our wire suitable for dynamic structural components and seismic-rated steel framing.
We provide a range of customization options for distributors and large-scale manufacturing operations. This includes customized packaging (branded carton boxes and customized label specifications), alternative spool formats (15kg plastic spools, wire basket spools, or 250kg/350kg bulk drum packaging for robotic stations), and specific chemical formulations tailored to meet narrow metallurgical tolerances for specialized applications.
Alternative steel, stainless steel, and flux-cored options available for wholesale container shipping.
Yuxin
