ED030392 - Lincoln Metalshield MC-6 .045 Metal Core Wire 33lb Spool

Technical Overview of Lincoln Metalshield MC-6

The Lincoln Electric Metalshield® MC-6® is a premium metal-cored wire engineered for high-performance fabrication environments. Designated with the AWS classification E70C-6M H4, this .045-inch diameter wire is formulated to deliver superior arc characteristics specifically tailored for fast-follow and high-travel-speed applications. As a metal-cored consumable, it combines the high deposition rates of flux-cored wires with the high efficiency and low slag generation of solid wires, making it an ideal choice for automated and robotic welding cells where cycle time is critical.

One of the defining technical attributes of the MC-6 is its H4 diffusible hydrogen designation. This indicates that the wire produces a weld deposit with very low hydrogen content (less than 4ml per 100g of weld metal), significantly reducing the risk of hydrogen-induced cracking (cold cracking) in the heat-affected zone. This is particularly vital when welding thicker sections or higher strength mild steels where rapid cooling rates might otherwise promote brittle microstructures. The wire is designed to operate with mixed shielding gases, typically high-argon blends, which promote a stable spray transfer mode that supports the high travel speeds the wire is known for.

The chemical composition of the core elements provides deoxidizing action, allowing the MC-6 to handle light mill scale and surface contaminants better than solid ER70S-6 wires, minimizing the need for extensive pre-weld cleaning. Despite this cleaning action, the wire maintains minimal spatter levels, which preserves the longevity of contact tips and nozzles in continuous welding operations. The 33 lb spool packaging is standard for industrial wire feeders, ensuring compatibility with a wide range of equipment setups. The wire's ability to wet out smoothly at the toes of the weld, even at lower voltage parameters, helps mitigate stress concentrations and improves fatigue life in dynamic components.

In summary, the Metalshield MC-6 represents a technical solution for manufacturers seeking to optimize throughput without compromising metallurgical integrity. Its balance of speed, low hydrogen, and forgiving arc characteristics makes it a staple in automotive and general heavy fabrication sectors.