ED025945 - Lincoln SuperArc L-56 ER70S-6 .035" MIG Wire - 44 lb Steel Spool

Technical Analysis: SuperArc® L-56® ER70S-6 Performance

The Lincoln Electric SuperArc® L-56® is a premium copper-coated carbon steel solid wire classified as AWS A5.18 ER70S-6. It is specifically engineered with elevated levels of manganese and silicon deoxidizers. These chemical additions are critical for scavenging oxygen and impurities from the weld pool, making L-56 an exceptional choice for welding on base materials with medium to heavy mill scale, rust, or oil. The result is a sound, porosity-free weld deposit with superior mechanical properties compared to standard ER70S-3 wires.

Arc Characteristics and Transfer Modes:
This .035" (0.9 mm) wire is highly versatile, supporting all major metal transfer modes including short-circuiting, globular, axial spray, and pulsed spray transfer. The proprietary copper coating process ensures consistent diameter control and lubricity, which promotes stable arc initiation and reduces micro-arcing inside the contact tip. This leads to reduced tip wear and fewer burn-backs. The wire exhibits excellent toe-wetting action, providing a smooth transition at the weld toes which helps minimize stress concentrations and improves fatigue life in dynamic applications.

Applications and Specifications:
Designed for all-position welding, the SuperArc L-56 yields weld metal with tensile strengths typically in the 85-100 ksi range (depending on shielding gas and cooling rates) and yield strengths between 55-70 ksi (380-485 MPa). It is widely specified for automotive components, pressure vessels, and general structural fabrication. The 44 lb steel spool fits standard industrial wire feeders and provides ample material for continuous operation in robotic cells or heavy fabrication stations.