Carbon nanotubes (CNTs), is one of the most wanted materials in the field of nanotechnology research. Multi-walled carbon nanotubes (MWCNTs) nowadays have paramount importance in the field of industrial and aerospace applications owing to their high tensile modulus (>1TPa), thermal conductivity, chemical resistivity, high aspect ratio, ultra lightweight, etc. MWCNTs are used as an additive nanomaterial in polymer composite, metal-matrix composite and ceramic-matrix composite to enhance their properties. This work emphasizes on the synthesis of MWCNTs in air by arc discharge technique involving AC power supply using graphitic electrodes having purity of 99.99%. The cylindrical movable electrode was used as an anode while the stationary rectangular electrode as cathode. The overall process is coherent with respect to manual metal arc welding except, for polarity. Due to the continuous vaporization of carbo-cations in the plasma zone soot deposition took place on the cathode which consisted of MWCNTs along with some impurities. Finally, after oxidation of powdered soot in muffle furnace, the morphological characterization of the same was done using FESEM, XRD and Raman spectroscopy. Results indicated that MWCNTs produced have length 120–280 nm and diameter 20–50 nm.