ED032588 - Lincoln Excalibur 7018 MR 3/32-inch Stick Electrode, 10lb Can

Technical Specification and Performance Analysis

The Lincoln Electric Excalibur® 7018 MR® (SKU: ED032588) is a premium low-hydrogen stick electrode engineered for critical welding applications requiring superior mechanical properties and resistance to hydrogen-induced cracking. Conforming to AWS A5.1 E7018 H4R standards, this electrode is distinguished by its "MR" (Moisture Resistant) designation, indicating a coating formulation that absorbs 60% less moisture than typical E7018 electrodes under high-humidity conditions. This characteristic is vital for maintaining the low-hydrogen status (H4) of the weld deposit, ensuring diffusible hydrogen levels remain below 4 mL per 100g of weld metal, thereby significantly reducing the risk of delayed cracking in high-strength steels.

Mechanically, the Excalibur 7018 MR delivers exceptional results. As-welded properties typically exhibit yield strengths between 60-74 ksi (420-510 MPa) and tensile strengths ranging from 74-87 ksi (510-600 MPa), with elongation values of 24-36%. Impact toughness is robust, offering 20-304 ft-lbs at -20°F (-30°C), far exceeding the AWS requirement of 20 ft-lbs. The 3/32-inch (2.4 mm) diameter is optimized for precision work and all-position welding, operating efficiently on both DC+ (70-110 Amps) and AC (80-120 Amps) currents. The electrode's coating is designed for extreme bendability, allowing welders to curve the rod for access into difficult joints without the coating spalling or cracking, a common failure point in standard electrodes.

The chemical composition is tightly controlled, with low carbon (0.04-0.07%) and manganese (1.08-1.51%) content to ensure ductility and weldability. The slag system is formulated for easy removal, often self-peeling, which enhances productivity by reducing post-weld cleanup time. This electrode is particularly suited for code-quality work in industries such as power generation, petrochemical processing, and structural steel erection where radiographic quality is non-negotiable.