ED037107 - Lincoln Electric Metalshield MC-70 XLS Metal-Cored Welding Wire

Technical Overview: Lincoln Electric Metalshield® MC-70 XLS™

The Lincoln Electric Metalshield® MC-70 XLS™ represents a significant advancement in metal-cored wire technology, specifically engineered to address the common challenges associated with silicon island formation in mild steel welding. Classified under AWS E70C-6M, this consumable is designed for the Gas Metal Arc Welding (GMAW-C) process, utilizing high-argon shielding gas blends to achieve optimal mechanical properties and arc performance. The proprietary chemical composition of the MC-70 XLS™ strictly controls the deoxidizers to ensure that residual silicon deposits are kept to an absolute minimum, resulting in an exceptionally clean weld surface that is often ready for painting or coating with little to no mechanical preparation.

From a metallurgical perspective, the wire provides a stable spray transfer arc with low spatter generation, characteristic of high-quality metal-cored electrodes. It is formulated to offer high deposition efficiency, typically ranging between 95% and 99%, which significantly outperforms solid wires and conventional flux-cored wires. The core ingredients facilitate excellent wetting action, allowing the weld puddle to flow smoothly at the toes, thereby reducing stress concentrations and improving fatigue life in dynamic applications. This wire is particularly well-suited for high-speed robotic and hard automation cells where consistency and cycle time are critical metrics.

The Metalshield® MC-70 XLS™ is optimized for single-pass and multi-pass applications in the flat and horizontal positions. While it is primarily a mild steel wire, its mechanical properties meet rigorous industry standards, providing reliable tensile and yield strengths suitable for automotive components, heavy equipment manufacturing, and general structural fabrication. By mitigating the formation of non-metallic inclusions on the bead surface, manufacturers can eliminate intermediate cleaning stages in multi-pass welds and reduce the risk of paint defects caused by silicon entrapment.

Key Technical Specifications:

• AWS Classification: E70C-6M
• Shielding Gas: Argon / CO2 Blends (typically 75-90% Argon)
• Current Type: Direct Current Electrode Positive (DCEP)
• Transfer Mode: Spray Transfer
• Alloy Type: Carbon Steel