difficulty in manufacturing, reactionless of the cracks to NDT techniques, the difference between the crack shape and that in
nature, and high cost, etc. In this research, we propose a new approach to create welding crack with residual stress using cast
iron electrodes. The process to create the welding cracks based on this technology using the SMAW combining with GTAW
allows to create the welding with cracks similar to those in nature. Cracks are created with lateral deviation not more than ± 0.5
mm, well response to the phased array ultrasonic testing technique and have similar shape to natural shape of the crack defect.