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NS ARC™ MC 80CNi1 Tru-Core® MC 80C-Ni1 is a low alloy steel, composite metal cored electrode for gas shielded arc welding low alloy, and certain carbon, steels requiring tensile strengths in excess of 80 ksi and good CVN values at temperatures as low as -50°F. This electrode is intended to be used with a shielding gas blend of 95-99% Argon/Balance Oxygen, but performs well with 75- 95% Argon/Balance Carbon Dioxide as well. The MC 80C-Ni1 can be used in single and multiple pass applications, both in fillets and groove welds.