S. T. Chitrambalam, C. L. Huat, P. B. Onn, S. Hemavathi, I. S. Mohammad, and S. Mat, “An Investigation on Relationship between Process Control Para meters and Weld Penetration for Robotic CO2 Arc Welding using Fa ctorial Design Approach”, JMET Journal UTeM, vol. 4, no. 2, Aug. 2015.