S527508-550 - Hobart ER309LSi .035" Stainless MIG Wire - 550lb Drum

Smooth Feeding and Superior Bead Appearance

If you are welding stainless steel to mild steel all day, you know the struggle of getting the puddle to flow just right without undercutting or piling up. The Hobart 309L Hi Sil .035" MIG wire is designed to solve exactly that problem. The "Hi Sil" stands for High Silicon, and in the welding world, that means fluidity. When you run this wire, you will notice the puddle wets out much better than standard 309L wire. The bead lays down flat and smooth, washing into the edges nicely. This means you spend less time grinding down high crowns or fixing cold lap, and more time welding.

This wire comes in a massive 550 lb drum, which is a dream for shop productivity. Instead of stopping every few hours to swap out a 33 lb spool, you can keep the arc burning for days or even weeks depending on your volume. The wire feeds from the drum with a consistent cast and helix, preventing the "wavy" wire issues that can cause contact tip burn-back or erratic arcs. It is designed to glide through conduit liners, making it perfect for stationary bench work or robotic arms where drag can be a killer.

The 309L chemistry is the industry standard for joining dissimilar metals. Whether you are welding brackets onto a stainless tank, working on automotive exhaust systems where stainless meets carbon flanges, or laying down a buffer layer before hardfacing, this wire gives you a crack-resistant, ductile weld deposit. The low carbon content also helps protect the corrosion resistance of the stainless side, keeping your welds shiny and rust-free longer. Set your machine to DCEP, hook up your Argon/CO2 mix, and experience the difference a high-quality, high-silicon wire makes.

Why Choose Hobart 309LSi?

• Better Wetting: The puddle flows out to the toes effortlessly.
• Less Grinding: Smoother beads mean less post-weld cleanup.
• Non-Stop Welding: The 550 lb drum keeps you welding, not changing spools.
• Versatile: Perfect for 304 to Mild Steel or overlay work.