EX309LSI-035M - Exocor ER309LSi .035 MIG Wire 33lb Spool

Smooth Welds for Stainless-to-Steel Projects

Tackle your toughest mixed-metal projects with confidence using the Exocor ER309LSi .035" MIG Wire. If you have ever struggled with sluggish weld puddles or lumpy beads when welding stainless steel to mild steel, this wire is the solution you have been looking for. The "Si" stands for High Silicon, a special addition to the alloy that makes the molten metal more fluid. This means the puddle flows out naturally, wetting into the edges of the joint smoothly and leaving you with a flat, professional-looking bead that requires minimal cleanup.

This 33lb spool is built for serious fabricators who need consistent performance day in and day out. The .035-inch diameter is the versatile sweet spot for MIG welding, allowing you to handle a wide range of material thicknesses—from thin sheet metal to heavier structural plates—without constantly changing your setup. Because it is a solid wire, you get a clean weld with no slag to chip off, unlike flux-cored alternatives. It is perfect for automotive modifications, custom bracketry, and any repair job where you are marrying a stainless component to a steel frame.

Exocor is known for quality, and this spool is precision-wound to ensure it feeds smoothly through your MIG gun liner. No more bird-nesting or stuttering arcs halfway through a critical pass. Just set your machine to DCEP, hook up your Argon mix gas, and lay down welds that look as good as they hold. Whether you are building custom exhaust systems or repairing industrial machinery, the 309LSi gives you the control and appearance you need to take pride in your work.

Why Choose 309LSi?

Standard 309 wire is good, but 309LSi is better for appearance and ease of use. The extra fluidity helps wash the weld into the corners, reducing the chance of cold lap and making it easier for welders of all skill levels to produce high-quality results. It is the smart choice for anyone welding dissimilar metals.