Lincoln Metalshield MC-90 .052 Metal Core Wire 33lb

Stronger Welds, Faster Travel Speeds

When your job demands more than just a standard mild steel weld, the Lincoln Electric Metalshield MC-90 delivers the extra strength you need. This .052-inch metal-cored wire is built for heavy-duty projects where the steel needs to hold up under immense pressure. With a tensile strength of 90,000 psi (90 ksi), it is significantly stronger than standard ER70S-6 solid wires, making it the go-to choice for welding on heavy machinery, truck frames, and high-strength structural components. If you are fixing a bucket on an excavator or fabricating a custom chassis, this is the wire that ensures your welds won't crack under the load.

One of the biggest advantages of switching to Metalshield MC-90 is the way it runs. Because it is a metal-cored wire, it offers the best of both worlds: the speed and penetration of a flux-core wire without the heavy, chipping slag. You get a smooth, spray-transfer arc that hisses rather than crackles, laying down a flat, beautiful bead with almost zero spatter. The "slag" is essentially just small silicon islands that often pop off on their own or brush away easily, meaning you spend less time cleaning and more time welding. This 33lb spool is perfect for shop use, giving you plenty of material to tackle large jobs without constant changeovers.

The .052-inch diameter is a sweet spot for fabrication—thick enough to lay down a lot of metal quickly, but manageable enough for a variety of joint configurations. It wets out beautifully at the toes, reducing the risk of cold lap and making your welds look professional with minimal effort. Designed to run on mixed gas (typically Argon/CO2), it provides a clean, hot arc that digs in deep. Upgrade your welding game with a wire that works as hard as you do.

Why Choose Metal-Cored?

If you are used to solid wire, you will be amazed at the deposition rate of the MC-90. It handles mill scale and minor surface rust better than solid wire, preventing porosity and bad starts. It’s a high-performance consumable that helps you get the job done faster, cleaner, and stronger.