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AWS A5.9 ER309LSi
1kg,5kg,15kg,20kg
1lb;2lb;4.5lb;11lb;15lb;20lb;33lb;44lb
0.6mm;0.8mm;0.9mm;1.0mm;1.2mm;1.6;2.0mm
0.023;0.030in;0.035in;3/64″;0.045;1/16″;5/64″
1.6mm,2.0mm,2.4mm,3.2mm,4.0mm,5.0mm
1/16 ″in;5/64″in;3/32″in;1/8″in;5/32″inch
D100,D200,D270,D300,BS300,K300
Acceptable (design the pack with your logo)
15 Days
Product Description
1）Classification: This is a specific American Welding Society (AWS) standard for a bare stainless steel filler metal, classified by its unique combination of properties.
2）Composition: The "ER309LSi" designation indicates a high-alloy filler metal with a nominal composition of 23-25% chromium and 12-14% nickel. The "L" signifies a low carbon content (0.03% max), while the "Si" denotes a higher silicon content than standard ER309L.
3）Application: This welding wire is most commonly used for welding dissimilar metals, such as joining stainless steel to carbon or low-alloy steels. It's also suitable for welding 309L stainless steel and for cladding applications.
4）Properties: The low carbon content provides superior resistance to intergranular corrosion. The higher silicon content significantly improves the weld puddle's fluidity, which leads to better wetting action and a smoother, more aesthetically pleasing weld bead.
5）Welding Processes: While it can be used for TIG welding, its enhanced properties make it particularly well-suited for Gas Metal Arc Welding (GMAW/MIG), where it provides excellent arc stability and reduced spatter.
6）Industries: It is a popular choice in industries like food and beverage, chemical processing, and heavy fabrication, where both robust mechanical properties and a clean weld appearance are desired.
AWS A5.9 ER309LSi Stainless Steel Welding Wire.pdf
Standard： AWS A 5.9 YB/T5092 | Chemical Composition % | |||||||||||||
C | Mn | Si | Cr | Ni | P | S | Mo | Cu | ||||||
Grade ER309LSi | ≤0.03 | 1.0 – 2.5 | 0.65 – 1.0 | 23 – 25 | 12 – 14 | ≤0.03 | ≤0.03 | ≤0.75 | ≤0.75 | |||||
Type | Spool (MIG) | Tube (TIG) | ||||||||||||
Specification ( MM ) | 0.8、0.9、1.0、1.2、1.6、2.0 | 1.6、2.0、2.4、3.2、4.0、5.0 | ||||||||||||
Package | S100/1kg S200/5kg S270,S300/15kg-20kg | 5kg/box 10kg/box length :1000MM | ||||||||||||
Mechanical Properties | Tensile Strength Mpa | Elongation after fracture A（%） | ||||||||||||
≥ 550 | ≥ 35 | |||||||||||||
Diameter（MM） | 0.8 | 1.0 | 1.2 | 1.6 | 2.0 | 2.5 | 3.2 | |||||||
Current （A） | 70 ~ 150 | 100 ~ 200 | 140 ~ 220 | 50 ~ 100 | 100 ~ 200 | 200 ~ 300 | 300 ~ 400 | |||||||
AWS A5.9 ER309LSi Stainless Steel Welding Wire Parameters
| Diameter | Process | ||
| in | mm | ||
| 0.03 | 0.8 | GMAW | |
| 0.035 | 0.9 | GMAW | |
| 0.039 | 1.0 | GMAW | |
| 1/25.4” | |||
| 0.045 | 1.2 | GMAW | |
| 3/64” | |||
| 1/16” | 1.6 | GMAW | |
| 3/32” | 2.4 | GMAW | |
| Diameter | Process | ||
| in | mm | ||
| 1/16” | 1.6 | GTAW | |
| 3/32” | 2.4 | GTAW | |
| 1/8” | 3.2 | GTAW | |
| 5/32” | 4.0 | GTAW | |
| 3/16” | 4.8 | GTAW | |
| Weight | 0.5kg | 1kg | 2kg | 5kg | 15kg | 20kg | |||||
| 1 lb | 2 lb | 4 lb | 11 lb | 33 lb | 44 lb | ||||||
AWS A5.9 ER309LSi is a bare stainless steel filler metal classified for its unique properties.
It's a high-alloy wire with both low carbon ("L") and high silicon ("Si") content, designed for superior welding performance.
The "L" stands for **Low Carbon**, which keeps the carbon content below 0.03% to prevent intergranular corrosion.
The "Si" stands for **Silicon**, indicating a higher silicon level than standard ER309L, which dramatically improves weld puddle fluidity and arc stability.
The main use is for **welding dissimilar metals**, such as joining stainless steel to carbon steel or low-alloy steel.
Its high alloy content allows it to withstand dilution from the base metal, creating a strong and crack-resistant joint.
The added silicon acts as a powerful deoxidizer and significantly improves the wetting action of the weld puddle.
This results in a smoother, flatter weld bead, reduced spatter, and a much cleaner final appearance, which is ideal for cosmetic welds.
Weld decay, or intergranular corrosion, occurs when chromium carbides form at grain boundaries due to welding heat.
The low carbon content in ER309LSi minimizes this carbide formation, ensuring the chromium remains available for continuous corrosion protection.
While it can be used for GTAW (TIG), the wire is specifically engineered and performs best with **GMAW (MIG) welding**.
The consistent wire feed and superior arc stability are perfect for automated and semi-automatic applications.
Yes, it is an excellent choice for a **buttering layer** on carbon steel prior to a stainless steel overlay.
The high alloy content and robust properties ensure a reliable transition layer that prevents cracking and premature failure of the final clad.
It has a nominal composition of **23-25% chromium** and **12-14% nickel**, which is higher than the standard 308 series.
This rich alloy makeup gives it the strength and flexibility to handle demanding tasks involving dissimilar metal joints.
It is perfectly suited for joining Type 309L stainless steel to itself, and most importantly, it's the go-to filler metal for joining stainless steel to carbon steel.
It can also be used for welding other stainless steels that require a higher alloy content.
You'll find this wire in the **food and beverage industry** for sanitary equipment, the **chemical processing industry** for tanks and vessels, and in **heavy fabrication** where dissimilar joints are a regular occurrence.
The weld deposit provides a robust joint with a typical tensile strength of over **85,000 psi (586 MPa)**.
Its high ductility and toughness ensure the weld can handle significant structural loads and thermal stresses.
Both are low-carbon, but the **higher silicon content** in ER309LSi is the key difference.
This provides superior weldability, a smoother bead, and better aesthetics, making it the preferred choice for MIG welding.
Preheating is generally not necessary when welding stainless steels to themselves.
However, when welding thick sections or joining dissimilar metals, a mild preheat might be beneficial to prevent cracking and manage heat input.
For optimal results, a shielding gas mixture of **98% argon and 2% carbon dioxide** is highly recommended.
This mixture provides a stable arc, minimal spatter, and a high-quality finish.
The high silicon content creates a fluid puddle that flows smoothly into the joint, resulting in a flat, clean weld bead that requires little to no post-weld grinding.
This is a major advantage for parts that need to be visually appealing.
The wire should be stored in a **clean, dry, and moisture-free environment**.
It's crucial to keep spools in their original sealed packaging until use to protect them from contaminants and moisture absorption, which can cause porosity.
Yes, its consistent chemical composition and excellent wire-feeding characteristics make it an ideal filler metal for automated and **orbital welding systems**.
It ensures repeatable, high-quality welds for critical joints.
The weld deposit contains a controlled amount of **delta ferrite** within the austenitic matrix.
This ferrite structure is engineered to prevent solidification cracking, which is a common problem in certain alloy welds.
While a highly versatile wire, its high silicon content can sometimes make the weld slightly more prone to hot cracking if welding parameters aren't optimized.
However, this is generally not a concern in most standard applications with proper technique.
For **MIG welding** where weld bead appearance and smooth performance are critical, choose **ER309LSi**.
If you are TIG welding or if weld aesthetics are not the primary concern, standard ER309L is a reliable and effective option.
