MIG Wire 309LSi – Stainless Steel & Mild Steel | 1.2mm | 15kg Roll

Looking for a wire that can confidently bridge stainless and mild steel in one weld? This 309LSi MIG wire is built exactly for that job.

It's a premium-grade, low-carbon stainless steel wire with a 24% Chromium / 13% Nickel composition, designed for Gas Metal Arc Welding (GMAW) of matching 309L stainless steels. What makes it especially handy in the workshop is its versatility — it's just as much at home joining stainless steel to mild steel as it is welding stainless to stainless.

Where it excels:

• Joining dissimilar "300 series" and select "400 series" stainless grades to mild steel and low alloy steels
• Acting as an intermediate or "buttering" layer when butt welding clad steels
• Laying down a stainless steel overlay on mild or low alloy steel
• Prepping a buttering layer before hardfacing or hard-surfacing work

Why welders like it:

• The low carbon content keeps carbide precipitation and intergranular corrosion at bay when welding low-carbon stainless grades — so your welds stay strong and corrosion-resistant over time
• A higher Silicon content means better arc stability, cleaner bead shape, and smoother edge wetting, giving you tidier, more professional-looking welds with less cleanup

The specs:

• Diameter: 1.2mm
• Roll weight: 15kg
• Ideal for: multi-metal fabrication, repair work, and applications where stainless meets mild steel

Whether you're doing structural repairs, fabrication crossing two metal types, or prepping surfaces for hardfacing, this 309LSi wire is a reliable, do-it-all choice that takes the guesswork out of dissimilar metal welding.