PURPOSE: To obtain a high C-low Ti-V weld metal having excellent low-temp. toughness by using a high-basicity low hydrogen type welding rod which consists principally of CaCO3 metallic fluoride such as CaF2 or the like and contains TiO2 at the lower rate than in the prior art.

CONSTITUTION: The component for the coating material of a coated arc welding rod is composed of the essential components consisting, by weight %, of 45W60 CaCO3, 10W25 metallic fluoride, 2W7 SiO2, 1.5W5 Si and 1W4 Mg and the components limited to ≤1 TiO2, ≤0.5 C, ≤2.5 Mn, ≤9 Cr, ≤4 Mo and ≤0.3 V in relation with the content of a core wire. The components of the core wire are composed of ≤0.18 C, ≤0.7 Si, ≤1 Mn, ≤4 Cr, ≤1.5 Mo, ≤0.15 Ti, ≤0.08 V and the balance Fe with inevitable impurities. The coating component is coated on said core wire by using a binder prepd. by mixing 1 or ≥2 kinds among sodium silicate, potassium silicate and lithium silicate to manufacture a coated arc welding rod. Arc welding is executed by using such rod.